JPS635978B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a control panel for controlling power equipment such as motors.

[Background technology]

As shown in FIG. 1, a conventional control panel houses a control section' in a control panel main body case (not shown).
Attach the operation display unit' to the control panel door (not shown),
Connect the control section' and the operation display section' with two common lines.
It is connected by seven crossover wires consisting of CL ₁ ', CL ₂ ' and five dedicated lines EL ₁ ' to EL ₅ '.

To explain the operation, in the stopped state,
When operation switch STA' is pressed, power terminal R' - Fuse F' - Common line CL ₁ ' - Stop switch STO' - Operation switch STA' - Dedicated line EL ₂ ' - Magnetic contactor MC' -
A current flows between the NC side of the switching contact tr' of the thermal relay TR' and the power terminal S', and the magnetic contactor MC' is energized and its normally open contact mc ₁ ' is closed and the power terminal
R' - Fuse F' - Common line CL ₁ ' - Stop switch
STO′ − Dedicated line EL′ ₁ − Normally open contact mc ₁ ′ − Magnetic contactor
Current flows between MC′, NC side of switching contact tr′ of thermal relay TR′, and power supply terminal S′, and the magnetic contactor
MC′ becomes self-holding state and the operation switch is turned on.
Even if STA' is returned to its original state, the state will be maintained.
At this time, at the same time, the normally open contact of the magnetic contactor MC′
When mc ₂ ' is closed, current flows between power terminal R' - fuse F' - normally open contact mc ₂ ' - dedicated line EL ₄ ' - operation indicator lamp RL' - common line CL ₂ ' - power terminal S' flows, the operation indicator lamp RL' lights up, the normally closed contact mc ₃ ' opens, and the power terminal R' - fuse F' - normally closed contact mc ₃ ' - dedicated line EL ₃ ' - stop indicator lamp GL' - Common line CL ₂ ′ and power terminal S′ are opened, stop indicator lamp GL ′ goes out, normally open contacts MC ₄ ′ to MC ₆ ′ are closed, and power is supplied to load LD ′ via thermal relay TR ′. be done.

When the stop switch STO' is pressed during operation, the power terminal R' - fuse F' - stop switch is
STO' - Normally open contact mc ₁ ' - Magnetic contactor MC' - NC side of switching contact tr' of thermal relay TR' - Power terminal
S′ is opened, the normally open contact mc ₁ ′ for self-holding is opened, the normally open contact mc ₂ ′ is opened, the operation indicator lamp RL′ is turned off, and the normally closed contact mc ₃ ′ is opened. closes, the stop indicator lamp GL′ lights up, and the normally open contact
mc ₄ ′ to mc ₆ ′ are opened and power supply to load LD′ is stopped.

During operation, an overcurrent flows through the load LD', causing the thermal relay TR' to trip, and its switching contact to
When tr' switches to the NO side, the excitation of the magnetic contactor MC' stops in the same way as when the stop switch STO' is pressed, and the operation indicator lamp RL' goes out and the stop indicator lamp GL' lights up. At the same time, alarm relay ALX′ is energized and its normally open contact alx′ is closed.
Current flows between power terminal R' - fuse F' - dedicated line EL ₅ ' - fault indicator lamp OL' - common line CL ₂ ' - power terminal S', and fault indicator lamp OL' lights up.

However, such a conventional control panel requires as many as seven crossover wires to connect the control section housed in the control panel body case and the operation display section attached to the control panel door, and the wiring of the crossover wires is difficult. It was not easy to work with, and it also had the disadvantage of making it difficult to open and close the control panel door.

[Purpose of the invention]

The present invention can reduce the number of crossover wires between the control section and the operation display section, and can transmit operation and stop signals from the operation display section to the control section.
It is an object of the present invention to provide a control panel that can transmit stop and failure indication signals from a control section to an operation display section.

[Disclosure of the invention]

In the control panel of the present invention, first and second control-side common line connection terminals are connected to one and the other power supply terminals, respectively, and an operation relay is connected between the control-side dedicated line connection terminal and the other power supply terminal. The normally open contact of the electromagnetic contactor for load control is connected to the output normally open contact of the periodic disconnection means, and the normally open contact of the electromagnetic contactor for load control and A group of control side diodes is inserted and connected so as to restrict the energization direction of the output normally open contact of the periodic disconnection means to the other direction, and the energization to the load control electromagnetic contactor is controlled by the normally open contact of the operation relay. a control unit configured to forcibly cut off power to the load control electromagnetic contactor by a failure detection means and to operate the periodic disconnection means when a load failure occurs, and the first and second control side common lines; The first and second operation display side common line connection terminals are respectively connected to the connection terminals via first and second common lines, and the operation display side dedicated line is connected to the control side dedicated line connection terminal via a dedicated line. A normally open operation switch, a signal receiving relay, and a normally open contact of the signal receiving relay are connected between the first operation display side common line connection terminal and the operation display side dedicated line connection terminal. A normally closed stop switch is inserted and connected at a position where at least the normally open contacts of the signal receiving relay can be prevented from being energized, and the operating direction of the operating switch and the normally open contacts of the signal receiving relay is controlled as described above. The energization direction is regulated to be the same as the energization direction of the relay, and the energization direction of the signal receiving relay is the same as the energization direction of the normally open contact of the load control electromagnetic contactor and the output normally open contact of the periodic disconnection means. and an operation display unit provided with an indicator in which a group of operation display side diodes are inserted and connected so as to regulate the operation display side, and is supplied with power from the first and second operation display side common line connection terminals and responds to the signal reception relay. It is characterized by its structure.

With this configuration, only two common lines and one dedicated line are used as crossover lines,
Run and stop operation signals can be transmitted from the operation display section to the control section, and run, stop and failure display signals can also be transmitted from the control section to the operation display section, and furthermore, they can be displayed.

A first embodiment of this invention will be described based on FIG. This control panel has a control section housed in a control panel body case (not shown), an operation display section attached to a control panel door (not shown), and two common lines CL. ₁ , CL ₂ and one dedicated line
It is connected by three crossover wires consisting of EL ₁ . _T1 ,
T ₂ is the control side common line connection terminal, T ₃ is the control side dedicated line connection terminal, T ₄ and T ₅ are the operation display side common line connection terminal,
_T6 is the dedicated line connection terminal on the operation display side.

To explain the operation, in the stopped state,
When operation switch STA is pressed, power terminal r → common line CL ₁ → stop switch STO → operation switch STA
→Diode D ₄ →Dedicated line EL ₁ →Alarm relay
NC side of switching contact alx ₁ of ALX → Diode D ₁ → Resistor R ₁ → Operating _relay Power terminal R - Fuse F - Normally open contact x ₁ - Magnetic contactor MC - Thermal relay TR
A current flows between the NC side of the switching contact tr and the power supply terminal S, and the magnetic contactor MC is energized, and the normally open contact _MC1
is closed and the other side is half-wave energized in the path of power terminal s → normally open contact mc ₁ → diode D ₂ → dedicated line EL ₁ → diode D ₅ → signal receiving relay Z → common line CL ₁ → power terminal r. , the signal receiving relay Z is energized and its normally open contact z ₁ is closed, and the power terminal r → common line CL ₁ →
Stop switch STO → normally open contact z ₁ → diode D ₄
→Dedicated line EL ₁ →Alarm relay ALX switching contact alx ₁
NC side → Diode D ₁ → Resistor R ₁ → Operation relay X
→A one-sided half-wave current flows in the path of the power supply terminal s, resulting in a self-holding state. At the same time, signal reception relay Z
By closing the normally open contact _z2 of the power supply terminal r-
Common line CL ₁ - Normally open contact z ₂ - Operation indicator RL -
Current flows between the common line CL ₂ and the power terminal s, the operation indicator lamp RL lights up, and the normally closed contact z ₃ of the signal receiving relay Z opens, so that the current flows between the power terminal r and the common line.
CL ₁ - Normally closed contact z ₃ - Stop indicator lamp GL - Common line
The circuit between CL ₂ and power terminal s is opened and the stop indicator lamp is displayed.
GL turns off. Moreover, the normally open contacts _mc2 to _mc4 are closed by the excitation of the electromagnetic contactor MC, and power is supplied to the load LD through the thermal relay TR.

In the operating state, when the stop switch STO is pressed, the power terminal r → common line CL ₁ → stop switch STO →
Normally open contact z ₁ → Diode D ₄ → Dedicated line EL ₁ → NC side of switching contact alx ₁ → Diode D ₁ → Resistor R ₁ → Operation relay The normally open contact x ₁ opens and the excitation of the magnetic contactor MC stops, and the normally open contacts mc ₂ ~ _{mc 4}
opens, the power supply to the load LD is stopped, and the normally open contact
mc ₁ is opened and power terminal s → normally open contact mc ₁ - diode D ₂ → dedicated line EL ₁ → diode D ₅ → signal reception relay Z → common line CL ₁ → power terminal r path is opened and signal reception Excitation of relay Z is stopped, normally open contact _z1 is opened, and self-holding is released. Also,
At the same time, the normally open contact z ₂ opens and the operation display lamp RL turns on.
goes out, normally closed contact z ₃ closes, and the stop indicator lamp turns off.
GL lights up.

During operation, an overcurrent flows through the load LD, causing the thermal relay TR to trip, causing its switching contact to
When tr switches to the NO side, the excitation of the magnetic contactor MC stops, normally open contacts MC ₂ to _{MC 4} open, and the load LD
The power supply to is stopped and the normally open contact mc ₁ is opened. On the other hand, the alarm relay is activated by switching the switching contact tr to the NO side.
ALX is energized, its normally open contact alx ₂ closes, the flicker relay FCR starts operating, its normally open contact fcr is intermittently closed, and the switching contact alx ₁ of alarm relay ALX changes to the NO side. Switch to power terminal s →
Normally open contact fcr → diode D ₃ → NO of switching contact alx ₁
side → Dedicated line EL ₁ → Diode D ₅ → Signal receiving relay Z → Common line CL ₁ → Current flows intermittently in the path of power terminal r, so signal receiving relay Z is intermittently excited and normally open. Since contact z ₂ is intermittently opened and normally closed contact z ₃ is intermittently closed, the operation indicator RL flashes and the stop indicator lamp blinks.
GL blinks in reverse to indicate a malfunction.

In addition, in the figure, capacitor C ₁ , which is connected in parallel to operation relay X and signal reception relay Z,
_C2 is intended to prevent chattering of the contacts that occurs when each relay X, Z is operated in a half-wave, and is designed to smooth the voltage applied to the coil. In addition, resistor R ₁ inserted and connected in series with operation relay X forms a time constant circuit with capacitor C ₁ , and by delaying the operation of operation relay In state, thermal relay TR
This is for stably operating the operating relay X and signal receiving relay Z to the safe side (non-excited side) when the relay is reset. That is, if resistance R ₁
Otherwise, if you reset the thermal relay TR and switch the changeover contact tr to the NC side with the normally open contact fcr of the flicker relay FCR closed, the excitation of the alarm relay ALX will stop and the changeover contact alx ₁ will close. N.C.
At this time, the power terminal r → common line
CL ₁ → Stop switch STO → Normally open contact z ₁ → Diode D ₄ → Dedicated line EL ₁ → NC side of switching contact alx ₁ → Diode D ₁ → Operation relay Relay X is energized,
Normally open contact x ₁ is closed, magnetic contactor MC is energized, power is supplied to load LD, signal receiving relay Z is energized, and this state is maintained. Resistor R ₁ eliminates this problem and delays operation of operating relay X until normally open contact z ₁ opens.

Further, the stop switch STO may be inserted at the position _P1 or _P2 in the figure instead of the illustrated position. Further, a series circuit of normally open contact alx ₂ and flicker relay FCR may be connected between power terminals r and s.
Moreover, a photocoupler may be used for the signal receiving relay Z etc. instead of a contact type one.

As a result of this configuration, the control unit and the operation display unit are connected via two common lines CL ₁ and CL ₂ and one dedicated line.
Just connect using the 3 wires of EL ₁ ,
A running operation signal and a stop operation signal can be sent from the operation display section to the control section, and an operation display signal, a stop display signal, and a failure display signal can be sent from the control section to the operation display section and displayed. Note that when the number of control systems in the control panel is N, the number of crossover wires is N+2. In addition, the parts used to reduce the number of crossover wires are two: an operation relay X, a signal reception relay Z, and a diode D ₁ ~
Only _D5 , capacitors _C1 , _C2 , and resistor _R1 are required, making the circuit configuration simple, highly reliable, and low cost.
General relays can also be used for the two relays X and Z mentioned above. Furthermore, there is no need for special handling of each display and operation, including the failure display, and maintenance is easy because there is no difference from a general wiring system. Furthermore, since the operation display section is under low pressure, it is safe.
In addition, like conventional self-holding circuits, self-holding is released in the event of a power outage, and the load LD does not suddenly start operating when the power is restored, making it safe.

A second embodiment of the invention will be described based on FIG. This control panel uses an operation display section'' instead of the operation display section shown in Fig. 2.This operation display section'' is a normally open contact of the signal receiving relay Z.
The open/closed status of z ₂ is detected by the signal processing circuit SP, and when the normally open contact z ₂ is normally closed, the operation indicator lamp is displayed.
RL lights up, and when normally open contact z ₂ is always open, the stop indicator lamp GL lights up, and normally open contact z ₂
is opening and closing periodically, the fault indicator lamp
It is designed to light up the OL and stop indicator lamp GL. Note that EE is a DC power supply that drives the signal processing circuit SP.

Next, the configuration and operation of the signal processing circuit SP will be explained based on FIGS. 8 and 9. In Fig. 8, 1 is an input interface circuit that converts the on/off state of the normally open contact _z2 into high/low output voltage.
Voltages as shown in FIG. 9A are generated corresponding to the operating period, stop period, and failure period. 2 is a retrigger type monostable multivibrator that is triggered by the rise of the output voltage of input interface circuit 1, and its output is at a high level for a certain period of time immediately after the start of operation and during the failure period, as shown in Figure 9B. Become. The reason why the level remains high during the failure period is because the monostable multivibrator 2 is triggered and enters a metastable state, but is retriggered before reaching a stable state, and the on/off period of the normally open contact _z2 is It is necessary to make it shorter than the metastable period of vibrator 2. 3 is an integrating circuit that integrates the output voltage of the monostable multivibrator 2, and its output voltage is as shown in Fig. 9C. During the operation period, the pulse width in Fig. 9B is narrow, so the threshold value V _TH
However, if the normally open contact _z1 is turned on and off due to failure and the pulse width shown in FIG. 9B becomes longer, the threshold value _VTH will be exceeded. 4 is a driver circuit having a function of comparing the threshold value V _TH and the input voltage, and the output during the period when the voltage shown in FIG. 9 C exceeds the threshold value V _TH is
As shown in Figure D, the level becomes high and the fault indicator lamp OL lights up. 5 is a signal inversion circuit for inverting the output of the monostable multivibrator 2.
6 is an AND circuit which takes the logical product of the output of the input interface circuit 1 and the output of the signal inversion circuit 5, and its output is determined during the operation period and when the monostable multivibrator is in a stable state, as shown in FIG. 9E. At times, the level becomes high and the operation display lamp RL is lit via the driver circuit 7. 8 is a signal inverting circuit that inverts the output of the driver circuit 7;
As shown in Figure F, the stop indicator lamp GL is turned on via the driver circuit 9.

The effects of this embodiment are similar to those of the first embodiment.

A third embodiment of the invention will be described based on FIG. 4. This control panel uses an operation display section in place of the operation display section shown in FIG. This operation display section is displayed when you press the operation switch STA.
Common line CL ₁ → Operation switch STA → Diode D ₁₀
→ Diode D ₇ → Current flows through the path of dedicated line EL ₁ , which causes operation relay X and magnetic contactor
When the MC operates, current flows through the path of dedicated line EL ₁ → diode D ₆ → signal receiving relay Z → diode D ₈ → common line CL ₁ , and the normally open contact z ₁ closes and enters the self-holding state. Open contact z ₂ closes and operation indicator lamp
RL lights up, normally closed contact Z ₃ opens, and the stop lamp lights up.
GL turns off.

In this state, when the stop switch STO is pressed, the operation of the operation relay
The operation indicator lamp RL goes out and the stop indicator lamp GL turns off.
lights up.

Other configurations and operations are similar to those of the first embodiment.

The effects of this embodiment are similar to those of the first embodiment.

A fourth embodiment of the invention is shown in FIG. This control panel uses a control section' instead of a control section,
An operation display section is used in place of the operation display section, another operation display section is attached and housed in a remote operation panel (not shown), and the control section' and the operation display section are connected by common lines CL ₁ , CL ₂ and the dedicated line EL ₁ .

In this embodiment, the number of crossover lines between the control panel and the remote operation panel is reduced, and operation and stop control as well as operation, stop and failure indications can be performed between the two. stop switch
Although the insertion position of STO is different from that in Figure 4,
The operation is similar.

Note that the operation display section attached to the control panel door has not been treated to reduce the number of crossover wires.
The operation of this part will be explained. driving switch
Press STA″, power terminal r → stop switch
STO″ → Operation switch STA″ → Diode D ₁₁ → Changeover contact alx ₁ → Diode D ₁ → Resistor R ₁ → Operation _relay The operation indicator lamp RL'' lights up when the normally closed contacts x 3 are closed, and the stop indicator lamp GL'' goes out when the normally closed contacts x ₃ are opened. And normally open contact x ₁
The electromagnetic contactor MC is activated by the closing of the load LD.
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When stop switch STO'_' is pressed in this state, the operation of operation _relay ” is lit, normally open contact
When x ₁ is opened, the operation of the magnetic contactor MC is stopped and the power supply to the load LD is stopped.

Also, if the thermal relay TR trips,
The operation of the electromagnetic contactor MC stops, and the power supply to the load LD is stopped.Also, the alarm relay ALX is activated, its normally open contact ALX ₃ is closed, and the failure indicator lamp OL'' lights up.

In addition, the operation switch STA'' and the stop switch
The operation display section will be linked to the operation of STO'', and conversely, the operation switch STA and stop switch STO will be linked.
The operation display section will be linked to the operation.

The effects of this embodiment are similar to those of the first embodiment.

A fifth embodiment of this invention will be described based on FIG. 6. This control panel has a remote operation display section attached to the control section, and the operation switch STA
When pressed, the electromagnetic contactor MC is activated, the signal reception relay Z is activated, the operation relay X is activated, and the operation indicator lamp RL is lit. In this state, when the stop lamp STO is pressed, the electromagnetic contactor MC, signal reception relay Z, and operation relay X will stop operating in sequence.

Other configurations and effects are similar to those of the first embodiment.

A sixth embodiment of this invention will be described based on FIG. This example is a normally open contact of a magnetic contactor MC.
Connect the normally open contact fcr of the flicker relay FCR in parallel to mc ₁ , and connect the series circuit of the diode D ₁ , operating relay _X , and the normally closed contact fcr' of the flicker relay FCR in parallel to the series circuit of normally open contact mc ₁ and diode D2 However, the difference from the first embodiment is that the switching contact _alx1 is removed.

Regarding the operation, the normal running operation and stopping operation are the same as in the first embodiment. Furthermore, when the thermal relay TR is tripped, the operation of the signal reception relay Z is made and disconnected by opening and closing of the normally open contact fcr, as in the first embodiment, and the operation is performed according to the opening and closing of the normally closed contact fcr'. The energizing path of relay X is opened and closed, and energization of operating relay X is prohibited when signal receiving relay Z is operating. Note that this normally closed contact fcr' has the function of preventing the intermittent operation of the operation relay that is linked to the opening and closing of the normally open contact _z1 of the signal receiving relay Z, and may not be necessary depending on the type of load LD. It is.

〔Effect of the invention〕

The control panel of the present invention has the advantage that the number of connecting wires between the control section and the operation display section can be reduced, and it is also possible to control operation and stop, as well as display operation, stop and failure.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventional control panel, Fig. 2 is a circuit diagram of a first embodiment of the present invention, Fig. 3 is a main part circuit diagram of a second embodiment of this invention, and Fig. 4 is a circuit diagram of a conventional control panel. FIG. 5 is a circuit diagram of the fourth embodiment of the invention, FIG. 6 is a circuit diagram of the fifth embodiment of the invention, and FIG. 7 is a circuit diagram of the fifth embodiment of the invention. FIG. 8 is a detailed block diagram of the main part of FIG. 3, and FIGS. 9A to 9F are waveform diagrams of the respective parts. ...control section, ...operation display section, X ...operation relay, x ₁ ...normally open contact, MC ...magnetic contactor,
mc ₁ ...Normally open contact, TR...Thermal relay, tr
...Switching contact, ALX...Alarm relay, FCR...
Flickering relay, fcr...normally open contact, Z...signal receiving relay, z ₁ ...normally open contact, STA...operation switch, STO...stop switch, CL ₁ , CL ₂ ...
Common line, EL ₁ ... Dedicated line, RL... Operation indicator lamp, GL... Stop indicator lamp, OL... Failure indicator lamp, D ₁ to _{D 10} ... Diode.

Claims (1)

[Claims] 1. In response to turning on the operation switch of the operation display section, one side half-wave current is applied to the operation relay of the control section through a dedicated crossover wire, and the electromagnetic contactor for load control of the control section that responds to the operation relay is normally opened. In response to the turning on of the contact, a half-wave current is applied to the receiving relay of the operation display unit, which has its own normally open contact connected in parallel to the operation switch, through the dedicated crossover wire, and the stop switch of the operation display unit is turned off. an output of the periodic intermittent means of the control section when the failure detection means of the control section is activated to block at least one half-wave energization in response and cut off the energization to the load control electromagnetic contactor in the event of a load abnormality; The control panel is configured to cause the receiving relay to be energized intermittently through the dedicated crossover wire by periodic on/off operations of contacts, and to cause the receiving relay to respond to a display of the operation display section.