JP4705790B2 - Control method of automatic ice machine - Google Patents

Description

  The present invention controls an automatic ice maker comprising compressor protection means for starting a compressor after being delayed by a predetermined time by turning on power, and switch means for starting deicing operation by turning on during operation. It is about the method.

  For example, an automatic ice maker equipped with a closed cell type ice making mechanism is provided with an evaporator connected to a refrigeration mechanism consisting of a compressor, a condenser, an expansion valve, etc., and defines many ice making chambers that open downward. The ice making chamber and the ice making chamber are closed so that they can be tilted and opened from below, and have a fountain hole corresponding to each ice making chamber, and a water tray integrally provided with an ice making water tank at the bottom. . This automatic ice making machine circulates and supplies refrigerant to the evaporator during ice making operation to forcibly cool the ice making chamber, and also supplies ice making water in the ice making water tank to the ice making chamber through the fountain hole of the water dish. The ice making chamber is configured to generate ice blocks. After completion of ice making, the operation shifts to deicing operation, tilting the water dish downward to open the ice making chamber, and switching the hot gas valve in the refrigeration mechanism to the evaporator with hot gas (high temperature / high pressure vaporization). The ice making chamber is heated by circulating and supplying a refrigerant, and the ice block is separated. As described above, the automatic ice maker is configured to continuously generate a large amount of ice blocks by alternately repeating the ice making operation and the deicing operation.

  The automatic ice making machine is set to start from the deicing operation when the power switch is turned on and the power is turned on. In other words, when the power is turned on again after a power failure or when the user turns off the power during the ice making operation, the ice making operation is started with the ice block remaining in the ice making room by starting from the deicing operation. In addition to preventing the generation of ice, it is possible to discharge the ice making residual water from the ice making water tank so that the ice making water stored in the water tray for a long time is not used.

Here, in the automatic ice maker, if the power is turned on or off in a short time by the user, and the compressor is repeatedly stopped and restarted in a short time, an excessive load is applied to the compressor. This is harmful. Therefore, there is an automatic ice making machine disclosed in Patent Document 1 provided with a compressor protection timer that starts the compressor with a predetermined time delay when the power is turned on.
JP-A-2-29550

  In the automatic ice making machine, by utilizing the fact that the deicing operation starts when the power switch is turned on, for example, in the maintenance at the installation site or in the inspection on the production line of the factory, the deicing operation status is checked or the ice making is performed. In order to release the ice after confirming the operation, an operation to turn on the power once is performed. However, when the automatic ice making machine is turned on to turn on the power switch to protect the compressor, the compressor will not start unless it is delayed for a predetermined time by the compressor protection timer. There is a problem that it takes time for maintenance and inspection on the production line of the factory.

  That is, the present invention has been proposed to solve these problems in view of the problems inherent in the control method for an automatic ice maker according to the prior art. It is an object of the present invention to provide a method for controlling an automatic ice maker which can immediately shift to deicing operation when the switch means is turned on and can improve the efficiency of inspection and inspection work.

In order to overcome the above-mentioned problems and achieve the intended purpose, a control method for an automatic ice making machine according to the present invention includes:
Compressor protection means for starting the compressor after being delayed for a predetermined time by turning on the power, and switch means for starting the deicing operation by turning on during operation, and making ice making operation and deicing operation In an automatic ice maker that produces ice blocks by repeating alternately ,
Wherein when turns on the switch unit, without involving the compressor protection means, rows that have the control immediately proceeds to the deicing operation,
When the deicing operation after turning on the switch means is completed, the ice making operation and the deicing operation are alternately repeated .

According to the first aspect of the present invention, if the switch means is turned on in any state, it can immediately shift to the deicing operation without involving the compressor protection means, so the deicing operation and the ice making operation are inspected. In the inspection and inspection work, it is possible to immediately shift to the deicing operation without waiting for the delay due to the compressor protection means, thereby improving the efficiency.

  According to a second aspect of the invention, in the control method for an automatic ice maker according to the first aspect of the invention, when the switch means is turned on after the power is turned on and before the compressor is started, the compressor is immediately started. Shift to deicing operation.

  According to the invention of claim 2, when the switch means is turned on after turning on the power and before starting the compressor, the compressor is immediately started and the deicing operation is started. Etc. can be performed quickly.

  According to a third aspect of the present invention, in the method for controlling an automatic ice maker according to the first aspect of the invention, when the switch means is turned on after the compressor is started, the deicing operation is performed without stopping the compressor. Transition.

  According to the invention of claim 3, when the switch means is turned on during the ice making or deicing operation, the compressor is shifted to the deicing operation without stopping the compressor. Can be done.

The invention of claim 4 is the method of controlling an automatic ice maker according to the invention of claim 3, wherein the automatic ice maker comprises an ice making part and a water tray that closes the ice making part so as to be openable and closable.
When the switch means is turned on while the opening of the water pan is stopped, control is performed to shift to the start time of the deicing operation with the water pan open.

  According to the invention of claim 4, for an automatic ice maker that closes the ice making part openably and closably with a water pan, when the switch means is turned on while the water pan is being opened, deicing with the water pan open. Since the operation shifts to the starting point of operation, the inspection and inspection can be performed more quickly without the water dish opening process.

The invention of claim 5 is the method of controlling an automatic ice maker according to the invention of claim 3, wherein the automatic ice maker comprises an ice making part and a water tray that closes the ice making part so as to be openable and closable.
When the switch means is turned on during the closing operation of the water dish or during the closing of the water dish, the water dish is controlled to be opened.

  According to the invention of claim 5, when the automatic ice maker that opens and closes the ice making unit with a water tray so as to be freely opened and closed, when the switch means is turned on during the closing operation of the water dish or during the closing of the water dish, Since the water dish is opened, after the water dish is opened, inspections and inspections can be performed quickly.

  According to a sixth aspect of the present invention, in the method for controlling an automatic ice maker according to the first aspect of the present invention, the compressor protection means is involved in measuring the delay time.

  According to the sixth aspect of the present invention, even when the delay time by the compressor protection means is being measured, when the switch means is turned on, the time measurement is interrupted so that the compressor protection means cannot be involved. .

  According to a seventh aspect of the present invention, in the control method for an automatic ice maker according to the first aspect of the invention, the involvement of the compressor protection means refers to the start of a delay time measurement.

  According to the seventh aspect of the present invention, when the switch means is turned on after the start of the compressor, the compressor protection means can be prevented from being involved by not starting the timing of the compressor protection means.

  According to the control method for an automatic ice maker according to the present invention, it is possible to immediately shift to the deicing operation by turning on the switch means, and the efficiency of inspection and inspection work can be improved.

  Next, the control method of the automatic ice making machine according to the present invention will be described below with reference to the accompanying drawings by giving a preferred embodiment.

  As shown in FIG. 1, an automatic ice making machine 10 according to the embodiment stores an ice making mechanism M that generates ice blocks, a refrigeration mechanism 16 that cools and heats the ice making mechanism M, and ice blocks generated by the ice making mechanism M. A stocker 32 is provided inside. The ice making mechanism M includes an ice making chamber (ice making section) 14 that defines a large number of ice making chambers 14a that open downward, an evaporator 18 that is meandered on the upper surface of the ice making chamber 14, and that is connected to the refrigeration mechanism 16, and an ice making mechanism. A water tray 22 is pivotally supported below the chamber 14 through a support shaft 24 so as to be tiltable, and is basically configured to open and close the ice making chamber 14. During the ice making operation, the ice making mechanism M drives the pump motor PM provided in the ice making water tank 20 provided in the water tray 22, and the tilting mechanism 26 holds the ice making chamber 14a in the closed position where the ice making chamber 14a is closed from below. The ice making water in the ice making water tank 20 is jetted and supplied to each ice making chamber 14a. At this time, the ice making chamber 14 is supplied and cooled by the refrigerant supplied from the refrigeration mechanism 16 to the evaporator 18, and ice blocks are generated in each ice making chamber 14a.

  Further, during the deicing operation, the tilting mechanism 26 is actuated by the actuator motor AM, so that the water dish 22 is tilted (lowered) downward toward the open position that opens the ice making chamber 14a around the support shaft 24. Then, hot gas is supplied to the evaporator 18 to heat the ice making chamber 14 so as to promote the removal of ice blocks. When the ice block is discharged from the ice making chamber 14a to the stocker 32, the tilting mechanism 26 is reversely operated by the actuator motor AM, so that the water tray 22 tilts (rises) upward and is held in the closed position. , Again configured to transition to ice making operation. As described above, the automatic ice making machine 10 controls the control means by signals output from input means such as various switches SW1, SW2, HS, the melted water timer TM2 and the ice making thermistor TH, which will be described later, so that the ice making operation and the deicing operation are sequentially repeated. Each device CM, FM, AM, PM, HV, WV is operated and controlled by the PC (see FIG. 2).

  In the automatic ice making machine 10, the operating state is switched by the control means PC based on the temperature detection of the ice making chamber 14 by the ice making thermistor TH disposed at an appropriate position of the ice making chamber 14. That is, when the ice making thermistor TH detects the ice making completion temperature at which ice blocks are generated in the ice making chamber 14a by the ice making operation, the control means PC switches the ice tray 22 from the ice making operation to the deicing operation water dish opening step, Lower. Further, when the ice making thermistor TH detects the temperature rise (ice removal completion temperature) of the ice making chamber 14 due to the completion of the ice removal from the ice making chamber 14 by the deicing operation, the control means PC performs the deicing operation. After the deicing process is switched to the water dish closing process and the water dish 22 is raised, it is set to shift to the ice making operation. The automatic ice making machine 10 is set to start from the deicing operation when the power switch DS is turned on and the power is turned on.

  When the actuator motor AM rotates forward in the water dish opening process, the water dish 22 is tilted downward by the tilting mechanism 26, and the water dish lowering detection switch SW1 provided on the movement locus of the tilting mechanism 26 is Is detected (water pan lowering detection switch SW1: ON), the control means PC stops the forward rotation of the actuator motor AM and holds the water tray 22 in the open position. Further, in the water dish closing step, the actuator motor AM rotates reversely, so that the water dish 22 is tilted upward by the tilting mechanism 26, and the water dish lift detection switch SW2 provided on the movement locus of the tilting mechanism 26 is When the arrival of the tray 22 to the closed position is detected (water tray rise detection switch SW2: ON), the control means PC stops the reverse rotation of the actuator motor AM and holds the water tray 22 in the closed position.

  The ice making mechanism M is provided with a water supply pipe 30 that opens above the water tray 22 and communicates with an external water system (not shown), and a water valve WV inserted in the water supply pipe 30 is controlled to be opened and closed by the control means PC. Is done. That is, when the ice making thermistor TH detects the deicing completion temperature, the water supply valve WV is opened (ON) for a predetermined time to supply tap water to the water tray 22 and stored in the ice making water tank 20 as the next ice making water. Set to do. The water supply valve WV is opened (ON) for a predetermined time (set time of the ice-melt water timer TM2) even when the water tray 22 reaches the open position after switching from the ice making operation to the deicing operation. It is set so that ice adhering to the upper surface of the water dish 22 is washed away by sprinkling tap water in the water dish 22.

  The refrigeration mechanism 16 is configured by connecting a compressor CM, a condenser 36, an expansion valve 38, and an evaporator 18 with a refrigerant pipe 34, and drives each compressor CM through the refrigerant pipe 34 by driving the compressor CM. , 36, 38, and 18, a predetermined cooling process is performed to return the refrigerant to the compressor CM again. In the ice making operation, the refrigerant is supplied to the evaporator 18 under the action of the devices CM, 36, and 38 in the cooling process, and heat exchange with the ice making chamber 14 is performed to cool to below the freezing point. Further, on the discharge side of the compressor CM in the refrigeration mechanism 16, hot gas that directly supplies hot gas (high-temperature / high-pressure vaporized refrigerant) from the compressor CM to the evaporator 18 without passing through the condenser 36 and the expansion valve 38. The tube 42 is branched. The hot gas pipe 42 is inserted with a hot gas valve HV for opening and closing the pipe line under the control of the control means PC. The hot gas valve HV is opened (ON) during the deicing operation and discharged from the compressor CM. The hot gas to be supplied is supplied to the evaporator 18 through the hot gas pipe 42, and the ice making chamber 14 is heated to cause each ice block to fall by its own weight. In addition, the code | symbol FM in a figure shows the fan motor which is drive | operated (ON) at the time of ice making operation, and cools the condenser 36 by air.

  The compressor CM is set to start with a predetermined time delay when the power is turned on by a compressor protection timer (compressor protection means) TM1. The compressor protection timer TM1 is set to start counting a preset time (predetermined time) when a power switch DS described later is turned on or when the control means PC is energized after recovering from a power failure. . The control means PC controls the compressor CM to start the deicing operation by starting the compressor CM by measuring the predetermined time by the compressor protection timer TM1.

  Inside the stocker 32, an ice storage switch HS that is operated according to the amount of ice blocks stored in the stocker 32 is disposed. When the ice storage switch HS is activated by the ice block and becomes the detection state (ON), the control means PC determines that the ice block is full, stops the ice making cycle that repeats the ice making operation and the deicing operation, and stops producing no ice block. When the ice storage switch HS returns to the non-detection state (OFF) as a result of the transition to the state and the ice block being consumed and decreasing, the ice making cycle is controlled to resume. It should be noted that when the ice making cycle is restarted with the transition of the ice storage switch HS from the detection state to the non-detection state, the ice storage switch HS is set to start from the deicing operation.

  The automatic ice making machine 10 is forcibly shifted to the deicing operation regardless of the operation state after turning on the power, the power switch DS for turning the power on or off, at an operation unit (not shown) provided at an appropriate position. For example, a deicing start switch (switch means) TS such as a tact switch and operation means for performing various settings are provided. The automatic ice maker 10 starts when the deicing start switch TS is turned on from when the power is turned on until the start of the deicing operation, or in any operation state of the ice making operation and the deicing operation. When the signal is input to the control means PC, the control means PC is controlled to immediately shift to the deicing operation without involving the compressor protection timer TM1. Specifically, when the power switch DS is turned on and the power is turned on, when the start signal from the deicing start switch TS is input to the control means PC during the measurement of the compressor protection timer TM1, By interrupting the count of the compressor protection timer TM1, the involvement of the compressor protection timer TM1 is stopped and the compressor CM is immediately started and the deicing operation is started. When the start signal from the deicing start switch TS is input to the control means PC while the ice making operation or the deicing operation is being performed, the timing of the compressor protection timer TM1 is not started. The deicing operation is started immediately without involving the compressor protection timer TM1.

  In the embodiment, the water dish opening step for tilting the water dish 22 from the closed position to the open position, the deicing process for discharging ice blocks at the open position of the water dish 22, and the water dish 22 is tilted from the open position to the closed position. The deicing operation proceeds in the order of the water dish closing process, and is a closed cell type ice making mechanism M, and the start signal from the deicing start switch TS is input in the deicing process when the water dish 22 is stopped open. In some cases, the control means PC is controlled so as to return to the start time of the deicing process while omitting the water dish opening process and keeping the water dish 22 open. Further, when a start signal from the deicing start switch TS is input during the water dish closing process or during the ice making operation, the control means PC controls to return to the start time of the water dish opening process. That is, the start of the deicing operation refers to the start of the water dish opening process or the start of the deicing process.

(Effects of Example)
Next, the operation of the control method for the automatic ice maker according to the embodiment will be described with reference to the flowcharts of FIGS. The automatic ice making machine 10 turns on the power switch DS or returns from a power failure and is turned on (step S1), and the compressor protection timer TM1 starts counting for a predetermined time (step S1). S2). Then, by counting up the predetermined time (step S3), the compressor CM is activated (ON) (step S4), and the water dish opening process of the deicing operation is started.

  In the water dish opening step, it is first determined whether or not the water dish lowering detection switch SW1 is turned on (step S5). If step S5 is negative, the actuator motor AM is rotated forward to tilt the water pan 22 until it reaches the open position, and the hot gas valve HV is opened to supply hot gas to the evaporator 18. The ice making chamber 14 is heated (step S6). When the water tray 22 is in the open position and step S5 is affirmed, the water tray opening process is omitted and the process proceeds to the deicing process. Also, when the water tray 22 reaches the open position and step S5 is affirmed, the process proceeds from the water tray opening process to the deicing process, and counting of the predetermined time in the melted water timer TM2 is started (step S7). At the same time, after the actuator motor AM is stopped and the water valve WV is opened (ON) (step S8), it is determined whether or not the ice making thermistor TH has detected the deicing completion temperature (step S9). If step S9 is negative, it is determined whether or not the ice-melt water timer TM2 has counted up a predetermined time (step S10). If the ice-melt water timer TM2 has counted up, the water valve WV is closed ( OFF) (step S11), the process proceeds to step S9 again.

  When the deicing process proceeds and the ice making thermistor TH detects the deicing completion temperature, when step S9 is affirmed, the hot gas valve HV is closed and the fan motor FM is driven to operate the ice making chamber 14. Cooling is started, and the water tray closing process is performed in which the actuator motor AM is rotated backward to tilt the water tray 22 upward (step S12). At this time, if the water valve WV is closed (OFF), the valve WV is opened (ON) and ice making water is supplied to the ice making water tank 20. When the water pan rise detection switch SW2 is turned on (step S13), the actuator motor AM is stopped to complete the deicing operation, and the pump motor PM is driven to start the ice making operation (step S14). ). When the ice making operation progresses and the ice making thermistor TH detects the ice making completion temperature and step S15 is affirmed, the process proceeds to step S6, the pump motor PM is stopped, the ice making operation is completed, and the deicing operation is started. To do.

  Next, the case where the deicing start switch TS is turned on at each timing in the ice making cycle will be described. While the compressor protection timer TM1 is counting a predetermined time from when the power is turned on until the deicing operation is started (between steps S1 and S4), the deicing start switch TS is turned on. When the start signal is input to the control means PC (timing A in FIG. 3), the control means PC interrupts the count of the compressor protection timer TM1 and proceeds to step S4 without performing the determination of step S3. Immediately, the compressor CM is activated to start the deicing operation. Further, after the ice making cycle after step S4 is started, the deicing start switch TS is turned on while the compressor CM is being driven, and the start signal is input to the control means PC (see B in FIG. 3). Timing), the control means PC starts the deicing operation without starting the compressor protection timer TM1 while driving the compressor CM.

  The control means PC shifts to the water dish opening process or the deicing process according to the open / close state of the water dish 22 at the time when the deicing start switch TS is turned on during the deicing operation. That is, when the deicing start switch TS is turned on after the start of the counting of the ice-melting water timer TM2 and before the counting up in the deicing process (timing C in FIG. 4), and the release signal is input to the control means PC. Since the water tray 22 is already in the open position, the control means PC forcibly shifts to the start time of the deicing process (step S7) by omitting the water dish opening process. Further, when the deicing start switch TS is turned on (timing D or E in FIG. 4) during the water dish closing process or ice making operation, and the opening signal is input to the control means PC, the water dish 22 Is in the closing position or in the closed position, the control means PC first shifts to the water dish opening step (step S6) in order to open the water dish 22. That is, the automatic ice making machine 10 is controlled by the control means PC so as to start from either the water dish opening process or the deicing process in the deicing operation in accordance with the timing of turning on the deicing start switch TS. The deicing operation inspection work can be carried out efficiently.

  As described above, the automatic ice making machine 10 is operated by turning on the deicing start switch TS (input of the release signal to the control means PC) in any operating state after the power is turned on. The decommissioning operation can be started immediately without stopping the compressor CM or by starting the stopped compressor CM while omitting the count of the compressor protection timer TM1. That is, the automatic ice making machine 10 immediately checks the deicing operation and the ice making operation because the deicing operation is started immediately by turning on the deicing start switch TS after the power is turned on during the inspection on the production line. be able to. Further, the automatic ice making machine 10 immediately removes the compressor CM without stopping even if the deicing start switch TS is turned on and returned to the state after the power is turned on during inspection on the production line or maintenance at the installation site. Since the deicing can be carried out by shifting to the ice operation, the inspection and inspection work can be shortened. Moreover, since the automatic ice making machine is provided with the deicing start switch TS in addition to the power switch DS and is set so that the compressor protection timer TM1 is started only when the power is turned on, the power switch DS is turned on / off, a power failure, etc. This can prevent the compressor CM from restarting in a short time after it stops. Therefore, it is possible to achieve both protection of the compressor CM and improvement of the efficiency of the inspection / inspection work described above without adding new parts or the like.

  FIG. 5 is a flowchart showing the operating state of the compressor of the automatic ice maker according to the modified example. In the modified example, when a start signal is input to the control means PC from the deicing start switch TS, the flow is returned to the count start time of the compressor protection timer TM1, and the control means PC performs Since the main control flow is the same as that of the embodiment, only different parts will be described. In addition, the same code | symbol is used about the same member demonstrated in the Example.

  In the modified example, after the power is turned on, when the deicing start switch TS is turned on and the release signal is input to the control means PC, the control means PC adds a completion signal of the compressor protection timer TM1, and the compressor The protection timer TM1 is shifted to the count start time (step S2). When the completion signal is input to the compressor protection timer TM1, it is determined that the counting by the compressor protection timer TM1 is completed, and the deicing operation is started immediately without involving the compressor protection timer TM1. Is set. For example, the deicing start switch TS is turned on while the compressor protection timer TM1 is counting a predetermined time after the power is turned on until the deicing operation is started (between steps S1 and S4). In the case (timing A in FIG. 5), the control means PC adds a completion signal (step S20) and controls to return to step S2. That is, since the completion signal of the compressor protection timer TM1 is input to the control means PC (step S21), the process proceeds to step S4 without starting the count of the compressor protection timer TM1, and the compressor CM is immediately activated. Start the deicing operation. If the deicing start switch TS is turned on while the compressor CM is being driven after the start of the ice making cycle after step S4 (timing B in FIG. 5), the control means PC adds a completion signal. Then, the process returns to step S2, and it is controlled that the deicing operation is started immediately while the compressor CM is driven, assuming that the delay of the predetermined time by the compressor protection timer TM1 is completed. And also in a modification, there exists an effect similar to an Example.

The automatic ice making machine according to the embodiment and the modified example can be modified as follows.
(1) In the examples and the modified examples, the closed cell type is described as the ice making mechanism, but the ice making mechanism is not limited to this, and can be applied to an automatic ice making machine including other ice making mechanisms such as an open cell and a flow-down type. .
(2) The switch means is not limited to the deicing start switch, and may be a reset switch that forcibly shifts the operation state to the deicing operation and returns various settings to the initial state at the time of shipment from the factory.
(3) In the embodiment, the compressor protection timer is incorporated in the control means, but may be provided independently of the control means.

1 is a schematic view showing an automatic ice making machine according to a preferred embodiment of the present invention. It is a control block diagram of the automatic ice making machine of an Example. It is a flowchart figure which shows the driving | running state of a compressor in the automatic ice maker of an Example. It is a flowchart figure which shows the driving | running state of the automatic ice making machine of an Example. It is a flowchart figure which shows the driving | running state of a compressor in the automatic ice maker of the example of a change.

Explanation of symbols

14 ice making room (ice making part), 22 water tray, TM1 compressor protection timer (compressor protection means)
CM compressor, TS deicing start switch (switch means)

Claims (7)

Compressor protection means (TM1) that starts the compressor (CM) after being delayed by a predetermined time by turning on the power, and switch means (TS) that starts the deicing operation by turning on during operation In an automatic ice making machine that produces ice blocks by alternately repeating ice making operation and deicing operation ,
Wherein the switch means (TS) to the ON operation, the compressor protection means (TM1) without involving, had immediately row control to move to the deicing operation,
When the deicing operation after turning on the switch means (TS) is completed, the ice making operation and the deicing operation are alternately repeated .   2. The automatic ice making according to claim 1, wherein when the switch means (TS) is turned on after the power is turned on and before the compressor (CM) is started, the compressor (CM) is immediately started and the deicing operation is started. How to control the machine.   The method for controlling an automatic ice maker according to claim 1, wherein when the switch means (TS) is turned on after the compressor (CM) is started, the deicing operation is performed without stopping the compressor (CM). . The automatic ice making machine (10) includes an ice making part (14) and a water tray (22) for closing the ice making part (14) so that the ice making part can be opened and closed.
When the switch means (TS) is turned on while the water pan (22) is not being opened, control is performed to shift to the start of the deicing operation with the water pan (22) open. Control method of automatic ice making machine of description. The automatic ice making machine (10) includes an ice making part (14) and a water tray (22) for closing the ice making part (14) so that the ice making part can be opened and closed.
When the switch means (TS) is turned on during the closing operation of the water dish (22) or during the closing of the water dish (22), control is performed to open the water dish (22). 3. A method for controlling an automatic ice making machine according to 3.   2. The method of controlling an automatic ice maker according to claim 1, wherein the compressor protection means (TM1) is involved in a delay time measurement. The control method for an automatic ice maker according to claim 1, wherein the compressor protection means (TM1) is involved in the start of a delay time measurement.

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