a, the roadway magnetic starter power supply pilot circuit is disconnected, or the control line is broken, causing the roadway magnetic starter to not be powered;
b. The control power transformer is damaged or the output power air switch is damaged;
c. The rectifier bridge on the relay board of the coal mining electrical control box is damaged, and the 24VDC power supply for the main controller is not;
d, the operation display station or the keypad is damaged, the "Reset" button cannot be reset;
e, the central processing unit (CPU) of the main controller is dead or unable to work;
f, the motor temperature protection circuit is open;
g, the master does not work.
Method of exclusion:
a. Identify faults and repair or replace components according to conventional inspection methods;
b. Repair or replace the transformer;
c. Check the bridge rectifier on the relay board and replace the rectifier bridge when damaged.
d. After the determination, replace the button board or operate the display station;
e, open the isolation switch to re-power;
f. Check the temperature control circuit with a multimeter according to the relevant parts displayed on the display screen;
g. Check the power supply for the main controller.
Second, the coal mining machine can not rise and fall failure analysis and elimination
a. The operation display station has a bad communication or the operation keypad is damaged;
b, the master controller is faulty;
c, solenoid valve or relief valve can not work properly;
d, the oil level of the fuel tank is too low or the filter is blocked;
e, increase the safety valve pressure setting value is low or damaged;
f, increase the hydraulic pump damage;
g, the hydraulic system enters too much air or the injected oil is unqualified.
Method of exclusion:
a. Connect the relevant line or replace the keyboard;
b. Replace the main controller or auxiliary board;
c. Observe the indicator light on the solenoid valve. When the power is turned on, the light is on. If it is not on, check the power supply line. Otherwise, check the suction force of the solenoid valve and the valve core to repair or replace the valve.
d. Require the addition of qualified hydraulic oil or cleaning oil filter;
e, re-adjust or replace;
e. Replace the hydraulic oil pump;
f. Exhaust or replace the hydraulic system.
3. Analysis and elimination of automatic sinking failure after the shearer drum is raised
a, the hydraulic lock is not tight or the spool is stuck;
b, the pipeline is damaged or the joint is loose;
c. Increase the fluid before and after the cylinder.
Method of exclusion:
a, repair or replacement;
b. Tighten or replace the pipeline;
c. Replace the cylinder.
Fourth, the analysis and elimination of the shearer failure
a, the operation display station is not reset or the main controller is faulty;
b, the time delay relay is off or the air switch is off;
c. The 36VAC power supply for the vacuum contactor coil is not turned on;
d. The output power of the traction transformer is too high or too low.
e, the inverter controller data failure, according to the fault prompted by the programmer to deal with;
f, 20VDC and 115VAC power supply for the inverter controller;
g, the inverter is faulty, K1 does not pull.
Method of exclusion:
a, re-power and reset, replace the main controller when several tests are not reset;
b. Press the relay or close the air switch;
c. Check the control power supply to make it within the allowable range;
d, adjust the voltage or replace the damaged parts;
e, the inverter parameters are wrong, correct the data;
f. Replace the auxiliary power box fuses FU5 and FU6 fuses;
g. Check the inverter circuit according to the fault content of the programmer.
Five, power transistor failure and detection method
First disconnect the load motor wiring and check with a digital multimeter. The shape of the transistor IGBT is shown in Figure 9-13 and the IGBT schematic Figure 9-14. Use the multimeter diode file to measure the parameters between the collector (C) and the emitter (E). For static detection: the positive electrode is connected to the emitter E, and the negative electrode is connected.
When the electrode C is used, the good transistor display value should be between 0.28 and 0.8V DC; if the positive electrode is connected to the collector C and the negative electrode is connected to the emitter E, the good transistor should display a reading of 1 (overflow), that is, C and E. Cutoff or a rising number. For dynamic detection: When the negative pole is connected to the positive pole of B, the C and E readings should be between 0.38 and 0.65V. The IGBT module does not allow the base B to open during operation or it will damage the IGBT module.
Six, the common fault analysis of the inverter
1, current failure 200% CURRENT
The reasons may be: A, the acceleration time is too short; B, the motor wiring is short-circuited between phases, grounding; C, the load is too large; D, the power module is damaged.
2, voltage failure LOW l ink VOLT low DC line voltage A, check rectifier module; B, FU4, R1, R2.
Low line voltage fault LOW LINE VOLT: This fault can occur if the line voltage value is lower than 85% of the normal voltage. FU2 blown
HI LINE VOLT line voltage high fault may be caused by: A, deceleration is too fast; B, input voltage is higher than 10% of normal voltage; C, incorrect parameters are input during programming.
3, the temperature is too high
The reason why the temperature rise of DRIVE OVERTMP inverter is too high may be: A, poor heat dissipation; B load is too heavy; C, inverter and motor wiring are imaginary; D, temperature switch is unqualified.
MOTOP OVERTMP indicates that the motor is overheated due to: A, the thermal plug is open or the temperature protection circuit is open; B, the load is too large; C, the motor load parameter setting is incorrect. 4000 overheating
DB OVER TEMP indicates that the brake temperature rise is too high. The reason may be: A, the power supply voltage is too large; B, too frequent speed conversion; C, the load is too large.
4, charging failure
The following aspects can be checked: A. Check the continuity of the insurance; B. Check the rectifier bridge: C. Measure the quality of the charging resistor. If it is burnt, replace the main control board. Co nTACTOR OPEN contact disconnected / CHARGING FLT charging fault.
5, communication failure COMM0-5
Analysis: A. Is the connection plug between the main control board and the console plugged in; B. Is the communication wiring too close to the power cable; C. If the remote operation is used, the shielding layer is grounded; D. If above If the situation does not exist, replace the controller or motherboard.
6, the charging light is not bright
Analysis: A. Check if the input line is connected well. B. When the inverter is in the stop state, the DC voltage reading is 20V; C. The inverter controller is in good condition.
7, the motor does not turn fault
Analysis: A, the wiring on the motor is intact; B, whether the wiring between the motor and the inverter is open; C, whether the plug connector of the control cable is tight.
8, the motherboard failure DATA FAULT data failure, replace the frequency conversion master
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