Technical Support
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1.Analysis and Resolution:
1) ROTOR FDBK S
Lifting: This fault occurs during the motor torque detection process before the device gives the gate opening signal.
Translation: There are no relevant instructions for the translation mechanism.
2) ROTOR FDBK Q1
This fault occurs during the operation of lifting 1, 2, 3 gears or forward translation 1, 2, 3 gears.,2,3 gears or forward translation 1, 2, 3 gears.
3) ROTOR FDBK Q2
This fault occurs during the operation of lifting or forward electric braking.
4) ROTOR FDBK Q3
This fault occurs during the electric operation of descending unloaded 1, 3 gears or reverse translation 1, 2, 3 gears.,2,3 gears or reverse translation 1, 2, 3 gears.
5) ROTOR FDBK Q4
This fault occurs during the reverse braking of descending or reverse translation.
2.Possible Causes:
1) Forward Contactor - KM1Cannot engage.
●Connection failure of the contactor coil's connecting wire, measure the voltage at both ends of the coil to determine.
●Intermediate relay failure (when used), measure the voltage at both ends of the coil to determine.
●Relay board failure output, measure the voltage from Thyromatdevice 10to 16 points.
●This fault may trigger RFB & CURNT LOSSfault.
2) Reverse Contactor - KM2Cannot engage.
●Connection failure of the contactor coil's connecting wire, measure the voltage at both ends of the coil to determine.
●Intermediate relay failure (when used), measure the voltage at both ends of the coil to determine.
●Relay board failure output, measure the voltage from Thyromatdevice 10to 15 points.
●This fault may trigger RFB & CURNT LOSSfault.
Note: Forward and reverse contactors with mechanical interlock can also easily trigger rotor feedback faults due to mechanical interlock failures.
3) Connecting motor rotor resistance and Thyromatdevice 17, 18 terminal cable looseness. Measure the resistance between Thyromat device 17 and 18 terminals, it should be less than 5 ohms.
Warning: In some cases, a low reading on the multimeter may be misinterpreted as a cable short circuit, refer to 4).
4) Rotor feedback cable short circuit.
To confirm that the short circuit phenomenon is not caused by low resistance readings (i.e., resistance close to 0 ohm) disconnect the rotor feedback cable at the rotor resistance connection end, the resistance value measured at this time should be in the megaohm range, and the resistance will gradually increase during measurement (due to the capacitance connected between terminals). If the reading is still close to 0 ohm, it indicates a cable short circuit. If the cable is still connected at terminals 17 and 18, and the reading is infinite, replace the control board, as the board has been damaged internally.
5) Control board failure
The cause of the fault may be a problem with the control board. When confirming that the problem is not due to any of the above reasons, we recommend replacing the control board. Ensure that the parameters from the original control board have been input into the replacement control board, if the fault still occurs, it may be caused by the following reasons:
6) Thyristor triggering failure
When the lifting 1to 4gear command is given, measure the voltage at Thyromat device terminals 17 and 18. Due to the fault system reporting a fault with a 2-second delay in a new cycle, any voltage signal reading must be completed quickly within this time. If a voltage signal is read during this time, the thyristor triggering circuit may be in working condition. The working state of the triggering circuit can be further confirmed by measuring the three-phase output voltage of Thyromat, and the measured readings should also be quickly recorded. If it is confirmed that the triggering circuit is working abnormally, we recommend replacing the triggering board.
If the three-phase output measurement is normal, or if the triggering board is replaced and the problem persists, then the issue may be related to the failure of the control box motherboard, in which case the entire device should be replaced.
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