CN2393847Y - Low frequency drive controller for digital high voltage hoist - Google Patents

Abstract

The utility model relates to a low frequency dragging electric controller for a full digital high voltage hoister. The structure of the utility model is that the utility model comprises a high voltage control cabinet, a hoisting motor M, a speed measuring motor CS, and a low frequency. A transformer TP and a full digital AC-DC-AC frequency converter are arranged in the low frequency cabinet; the transformer TP boosts a three-phase AC power supply then outputs three-phase AC low frequency voltage through a frequency converter; the three-phase AC low frequency voltage is sent into the side of a motor stator through a contactor 3PN for speed reducing creeping and low speed creeping; a full digital logic controller, a detecting plate, and a current mutual inductor LH are also arranged in the cabinet for controlling the running of the motor and the lifting device with zero load or light load or heavy load. The utility model has the advantages of high reliability, flexible control, convenient maintenance, high efficiency, etc.

Description

Digital high-tension boost machine low frequency drags electric controller

The utility model is that a kind of digital high-tension boost machine low frequency drags electric controller.

At present, the dragging in the scheme of China's high-tension boost machine, most interchange drive technologies that adopt wound rotor induction motor rotor loop crosstalk resistance, and the brake snub of high voltage induction motor and low speed jerking motion are very stubborn problems always.Along with the development of induction motor variable-frequency control technique, this thorny problem can adopt digital low frequency drive technology to solve in the deceleration section of creeping by ac elevator.Digital converter plant has AC/AC (alternating current) variable-frequency and ac-dc-ac inverter two big classes, wherein, because there is more, the problem of external special order that costs an arm and a leg and still need of components and parts in the AC/AC (alternating current) variable-frequency device, thereby is difficult to promote.So numerous enterprise customers wish that urgently relevant scientific research personnel and unit can develop the technology that adopts digital ac-dc-ac inverter device as early as possible.

The purpose of this utility model is to overcome the problems referred to above, provide a kind of digital high-tension boost machine low frequency of digital ac-dc-ac inverter technology that adopts to drag electric controller, this device is not only cheap, and dependable performance, is a kind of renewal product that can satisfy technological requirement.

The purpose of this utility model is achieved in that and comprises high pressure control cabinet, lifting motor M, speed measuring motor CS, low frequency cabinet that the high pressure control cabinet is delivered to the motor stator side with the three-phase high-voltage power supply through direct-reverse switch ZFC and carried out high-speed cruising; Voltage transformer TP, digital ac-dc-ac inverter device are housed in the low frequency cabinet, three-phase alternating-current supply is boosted TP after frequency converter output three-phase alternating current LF voltage, sending into the motor stator side by contactless switch 3PN again slows down and low speed jerking motion, digital logic controller, check-out console summation current transformer LH also are housed, control motor and the operation of bont when unloaded or light, heavily loaded in the cabinet.

The utility model control principle is: sent here by current transformer, the load current high low signal is delivered to check-out console, and operating in the underloading place with differentiation still is heavily loaded situation; The tachometer signal censorship drafting board that comes from tachometer is run with load or no-load run with differentiation, again by the check-out console feed signals to logic controller, enforcement is to the control of frequency converter, simultaneously by the high pressure control cabinet send the contact switch signal to logic controller to implement controlled condition.

After low frequency drops into, motor is through slowing down and two operation phase of low speed jerking motion: in the decelerating phase, motor is in the dynamic brake state, kinetic energy is recycled to frequency converter to be converted thermal energy consumption through brake unit to braking resistor and falls, incoming frequency instruction by logic controller control frequency converter descends by particular rate, just can make motor obtain suitable lock torque, and descend by the deceleration/decel of velocity diagram requirement; In the low speed jerking motion stage, after motor met the requirements of low speed, because frequency instruction is constant when low frequency, then motor carried out the transition to motoring condition automatically by braking mode, and keeps constant low speed jerking motion.

Advantage of the present utility model mainly is:

One, the reliability height, control can be controlled the braking procedure of motor flexibly easily, and gig is slowed down steadily, and off-position is accurate.

Its two, can alleviate labor intensity of operating personnel, enhance productivity.

Its three, all parameters are used the menu mode setting entirely, and are convenient, flexible, only need by button change correlation parameter.

Its four, have the each fault cause of automatic memory, make things convenient for the staff to safeguard.

Its five, low price, the enterprise by scrap build is accepted easily.

The utility model is described in further detail below in conjunction with embodiment and accompanying drawing.

Fig. 1 is the utility model structural representation.

Fig. 2 is the detection comparator circuit schematic diagram on the check-out console among Fig. 1.

Fig. 3 is the external circuits schematic diagram of frequency converter among Fig. 1.

Fig. 4 is the elementary diagram of logic controller among Fig. 1.

Fig. 5 is the decision circuit schematic diagram to the inner input of logic controller.

Fig. 6 is the sequential schematic diagram of logic controller.

As shown in Figure 1, the utility model comprises the high pressure control cabinet, promotes motor M, speed measuring motor CS and low frequency cabinet.The high pressure control cabinet is delivered to the motor stator side with the three-phase high-voltage power supply through direct-reverse switch ZFC and is carried out high-speed cruising.Voltage transformer TP, digital ac-dc-ac inverter device are housed in the low frequency cabinet, and TP boosts three-phase alternating-current supply after frequency converter output three-phase alternating current LF voltage is sent into the motor stator side by contactless switch 3PN again and slowed down and low speed jerking motion; Digital logic controller, check-out console summation current transformer LH also are housed, control motor and the operation of bont when unloaded or light, heavily loaded in the cabinet.

1 detection comparator circuit of being made up of unidirectional rectifier bridge, phase inverter Uc and comparator Ua, Ub and power discharging transistor 1T, 2T as shown in Figure 2 can be housed on the above-mentioned check-out console, after its tach signal that the load current signal and the speed measuring motor of motor are exported detects relatively, export 2 on-off signals and handle by logic controller.Unidirectional rectifier bridge is made up of diode D6, D7, D8, D10, and D7 positive pole, D8 negative pole connect the lead-in wire 3,4 of current transformer LH respectively, and D8, D10 positive pole meet D6, D7 negative pole and connected to chassis adjustable resistance W8 through resistance R 13.The central contact of W7, W8 connects R7, the K switch 4 of Ub circuit respectively.In the Ub circuit: the Ub negative terminal meets K4 through R10, R9, meets R7 through R8, and R9, R10 serial connection point is through capacitor C 4 ground connection, and R7, R8 serial connection point is through C3 ground connection; The Ub anode is through R12 ground connection; Ub mouth 7 connects altogether with an end and the power tube 2T base stage of W5, W6, and the central contact of W5, W6 connects the Ub negative terminal through D3 positive pole, D4 negative pole respectively, and the 2T emitter is respectively through signal relay 2J, diode 2D positive ground.Ua circuit and Ub circuit are basic identical, and just its K switch 5 connects the Uc mouth, has increased a K switch 2 in addition, and the K2 two ends connect R1, W12 center-point respectively.In the Uc circuit: the Uc negative terminal connects the W9 center-point through R19, connects W11, Uc mouth through C7, connects the W11 center-point through R20; The Uc positive ending grounding; W9 one end connects 637 terminals through R14, through C5 ground connection, and W9 other end ground connection.

Circuit on the check-out console is to be the circuit of core with the comparator from the above, after its tach signal that the load current signal and the speed measuring motor of motor are exported detects relatively, export 2 on-off signals and handle by logic controller, with judge at this moment bont for example the ore bucket of mining hoist operate in underloading or empty bucket-shaped attitude.Its unloaded testing process: the direct current forward voltage by tachogenerator output is sent into check-out console through 637, No. 633 terminals, becoming sky that inverse feedback voltage and W12 send here the given positive voltage that struggles against behind phase inverter Uc compares, its deviate is sent into comparator Ua, when lifting ore, and the operation of motor bringing onto load, rotating speed is lower, so feedback voltage is less than giving constant potential, deviation voltage be on the occasion of, No. 1 pin of Ua is exported negative voltage, aerotron 1T ends, and relay 1J does not work.When the sky bucket is not carried the ore deposit, empty load of motor operation, speed is higher, thus feedback voltage greater than giving constant potential, deviation voltage is a negative value, No. 1 pin output positive voltage of Ua, aerotron 1T conducting, relay 1J gets electric adhesive, its open contact is controlled the incoming signal of Logo.Its underloading testing process: when high-speed cruising,, determine underloading or heavy duty by detecting stator load current size.Because heavy duty electric current is 70A-80A, so if electric current is then thought underloading when 35A-40A is following.Detect to such an extent that the stator alternating current becomes d. c. voltage signal by rectifier bridge and takes out feedback end and the constant voltage power suspply-15V deliver to the comparator that amplifier Ub forms through W8 and compare through the given side voltage that W7 sends here by two utmost point transformer 4LH, when load current during greater than 40A, feedback end voltage is greater than given side voltage, Ub input deviation value is for just, No. 7 pin voltages of Ub output are for negative, aerotron 2T ends, and relay 2J does not work.When load current during less than 40A, feedback end voltage is less than given side voltage, and Ub input deviation value is for negative, and No. 7 pin voltages of Ub output are being for just, aerotron 2T conducting, and 2J gets electric adhesive, and its open contact closure is at the input end increase control signal of Logo.

Frequency converter of the present utility model is digital ac-dc-ac inverter device, has brake unit and braking resistor, can be at four-quadrant operation, can be under the output frequency of low frequency 2-4HZ, and run with load when voltage is 240-480V.Frequency converter of the present utility model can adopt a day intrinsic safety river VS-616G5A type product, and it is circumscribed with power circuit and control circuit.

As shown in Figure 3, in the power circuit: be provided with three-phase alternating current input voltage circuit, its A, B, C phase line are equipped with fast melting fuse 1RD, 2RD, 3RD respectively, phase lost protector 1QJ, pizo-resistance 1YR are housed between A, B phase line, phase lost protector 2QJ and pizo-resistance 2YR, 3YR are housed between B, C phase line, the A line passes winding 1LH, the 2LH of current transformer LH, and B, C line pass winding 2LH, the 3LH of LH, and the mouth of triple line meets frequency converter pin R, S, T respectively; Be provided with 1 braking circuit of being made up of brake unit DB, braking resistor DBR, DB pin P, N connect wiring pin 3, the zero line pin of frequency converter respectively, and the DBR cross-over connection is between pin P, the B of DB; Be provided with three-phase alternating current frequency conversion voltage by frequency converter pin U, V, W output.Control circuit is the circuit of instruction motor brake snub and low speed jerking motion, specifically: be provided with the forward and backward command circuit, be connected to frequency converter pin 1,2 respectively, and connect frequency converter pin 11 through forward operation relay DZJ, inverted running relay DFJ one end by debugging change-over swith ZHK respectively, DZJ, the DFJ other end and switch Q2, Q3, Q4, test rope relay YSJ one end and connect altogether and connect frequency converter pin 11 through the lock relay GZJ that works; Being provided with just changes heavily loaded deceleration instruction circuit, is connected to frequency converter pin 3, and connects the Q2 other end through DZJ, drops into relay PCJ through DZJ, DFJ, low frequency and connects frequency converter pin 7; Being provided with just changes empty bucket deceleration instruction circuit, is connected to the other end of frequency converter pin 4,8 and Q4, YSJ; Being provided with just changes frequency conversion semi-load and carries the hammer frequency instruction, is connected to frequency converter pin 6, and through the Q1 of parallel connection, the other end that DZJ meets Q3; Frequency converter pin 7,8 connects is respectively just changeing heavily loaded frequency instruction, just change empty bucket frequency instruction circuit; Frequency converter pin 20 is the instruction of 30C output emergency protection; Frequency converter pin 18 is through switch pin 20, and connecting to neutral line N.

As shown in Figure 4, can adopt Siemens LOGO230R type product in the logic controller, its Q1, Q2, Q3, Q4 link to each other with Q1, Q2, Q3, Q4 among Fig. 3, and they are respectively just to change underloading to promote, just changeing that heavy duty promotes, hammer is carried in counter-rotating, just changeing unloaded lifting output switching signal; 1JC, DZJ, 2J, 1J, PCJ one end are connected in L+, and its other end meets low frequency input timing commencing signal I5, forward lifting starting point incoming signal I4, underloading lifting incoming signal I3, empty bucket lifting incoming signal I2, low frequency input incoming signal I1 through switch respectively; L+ meets 220V and exchanges.

For above-mentioned logic controller is used by oneself better, specially imported 1 decision circuit as shown in Figure 5 to its inside, this circuit is by delay unit, form with door, NAND gate, not gate and binary pair.Delay unit is: B04, B05, B11, B14, B17.With door be: B02, B09, B13, B16, B18, B20.NAND gate is: B03, B07.Not gate is: B06, B08, B10, B12, B19.Binary pair is: B00, B01, B15.

The sequential of above-mentioned logic controller as shown in Figure 6, wherein 1JC and 1J, 2J are respectively the relay contact of high pressure control cabinet and 2 relay contacts on the check-out console, all the other symbolic significances are the same.

Claims (6)

1, a kind of digital high-tension boost machine low frequency drags electric controller, comprise the high pressure control cabinet, promote motor M, speed measuring motor CS, the high pressure control cabinet is delivered to the motor stator side with the three-phase high-voltage power supply through direct-reverse switch ZFC and is carried out high-speed cruising, it is characterized in that being provided with the low frequency cabinet, voltage transformer TP is housed in the cabinet, digital ac-dc-ac inverter device, three-phase alternating-current supply is boosted TP after frequency converter output three-phase alternating current LF voltage, sending into the motor stator side by contactless switch 3PN again slows down and low speed jerking motion, digital logic controller also is housed in the cabinet, check-out console summation current transformer LH, control motor and bont are unloaded or light, operation during heavy duty.

2, electric controller according to claim 1 is characterized in that frequency converter adopts a day intrinsic safety river VS-616G5A type product, and it is circumscribed with power circuit and control circuit.

3, electric controller according to claim 2 is characterized in that described power circuit, is provided with three-phase alternating current input voltage circuit, is connected to frequency converter pin R, S, T; Be provided with 1 braking circuit of being made up of brake unit DB and the braking resistor DBR that is attached thereto, DB pin P, N connect wiring pin 3, the zero line pin of frequency converter respectively; Be provided with three-phase alternating current frequency conversion voltage by frequency converter pin U, V, W output.

4, electric controller according to claim 2; it is characterized in that control circuit is the circuit of instruction motor brake snub and low speed jerking motion; frequency converter pin 1,2 connects its forward and backward instruction respectively, and pin 3 connects just changes heavily loaded deceleration instruction, and pin 4 connects just changes empty bucket deceleration instruction; pin 6 connects and just changes frequency conversion semi-load and carry the hammer frequency instruction; pin 7 connects just changes heavily loaded frequency instruction, and pin 8 connects just changes empty bucket frequency instruction, and pin 11 is public ground; pin 18 connecting to neutral line N, the instruction of pin 30C output emergency protection.

5, electric controller according to claim 1, it is characterized in that being equipped with on the check-out console 1 detection comparator circuit of forming by unidirectional rectifier bridge, phase inverter Uc and comparator Ua, Ub and power discharging transistor 1T, 2T, after its tach signal that the load current signal and the speed measuring motor of motor are exported detects relatively, export 2 on-off signals and handle by logic controller.

6, electric controller according to claim 1, it is characterized in that logic controller adopts Siemens LOGO23OR type product, and the decision circuit that 1 of input is formed by delay unit, with door, NAND gate, not gate and binary pair in it, output signal after the signal conditioning that this circuit comes check-out console and high pressure control cabinet is made the frequency size of frequency converter and the setting command signal of acceleration and deceleration.

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