Technical Support
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Analysis and Resolution:
1. Fault Code:
1) CURNT FDBK S
For the lifting mechanism, this fault occurs during the motor torque detection process before the device gives the gate opening signal; there is no relevant explanation for the translation mechanism.
2) CURNT FDBK Q1
This fault occurs during the operation of lifting 1, 2, 3 gears or the forward operation of the translation.、2、3gears or during the forward operation of the translation.
3) CURNT FDBK Q2
This fault occurs during the operation of lifting electric braking or forward braking of the translation.
4) CURNT FDBK Q3
This fault occurs during the electric operation of the mechanism in the descending no-load 1 gear or during the reverse operation of the translation.、2、3gear or during the reverse operation of the translation.
5) CURNT FDBK Q4
This fault occurs during the descending reverse braking or reverse braking of the translation.
2. Possible Causes:
Users can use a clamp-type ammeter (analog or digital) to assist in fault detection.
Initial Steps:
1) Press the "MENU" button on the control panel to enter the current transformer (CTs) interface.The third line on the LCD display shows the values of CT1, CT2, CT3.
2) The fourth line will show that all three phases are 0A.Given the forward lifting 1 gear or forward 1 gear of the translation, if the fault still exists, then the contactor will remain engaged for 2 seconds before the system reports the "CURNT FDBK S" fault.
3) Compare the readings of the clamp-type ammeter during this period with the readings on the display.
4) If the clamp-type ammeter shows 0A, then the display will naturally also show 0A..6)
5) Is the forward contactor engaged?If so, then the occurrence of the fault may be due to:
● Confirm that U, V, W three-phase thyristors are working properly.
Thyristor trigger circuit fault, replace the trigger board.
All three-phase thyristors are open circuit, replace them.Motor stator cable open circuit fault.Motor stator winding open circuit fault.
All three-phase thyristors are open circuit, replace them.If not: then the occurrence of the fault may be due to:
All three-phase thyristors are open circuit, replace them.Control power loss, confirm that the voltage between Thyromat control terminals 10 and 11 is normal.
All three-phase thyristors are open circuit, replace them.Measure the voltage of the corresponding forward contactor:
All three-phase thyristors are open circuit, replace them.7)
If there is voltage in the initial stage (2 seconds), then the contactor has a mechanical fault or coil fault. If there is no voltage in the initial stage (2 seconds), then check the voltage between Thyromat terminals 10 and 15 and between 10 and 16. If there is no voltage, replace the relay board.
All three-phase thyristors are open circuit, replace them.8)If the clamp-type ammeter has a reading, and the forward contactor is engaged, but the display shows 0A, then the problem may lie in the current conversion circuit.
All three-phase thyristors are open circuit, replace them.9)
Confirm that the CT plug is installed correctly. 10)Confirm that all 4 CT cables (red, yellow, blue, and green) are connected to the CT plug.11)
When giving the device forward and reverse 1 to 4 gear commands, measure the AC voltage output of the CT. The voltage value measured on any CT should be < 5V, and the values should be roughly equal. Generally, there should not be a situation where 3 CTs fail simultaneously. 12)
Unplug the CT plug and measure the DC voltage of the green cable against the other three-phase cables. When giving the device 1 to 4 gear commands, Thyromat will report the "CURNT FDBK S" fault after a delay of 2 seconds, so to measure the voltage values of all three phases, this process may need to be repeated several times. 13)
If no voltage is detected in any phase test, it indicates that the current transformer is faulty and needs to be replaced. 14)If the voltage is normal in the test (< 5VDC), then the problem may lie in the wiring between the control panel and the control board, or the control board itself is faulty. It is generally much more convenient to replace the control board than to first open the control panel and remove the wiring.
11) 当给装置正、反向1 至4档的指令时，测量CT输出的交流电压，在任何一个CT上测得的电压值应该都< 5V，并且值都应该大致相等。一般不应该有3个CT同时出现故障的情况。
12) 拔下CT插头，测量绿色电缆与其他三相电缆的直流电压。当给装置1至4档的指令时，Thyromat会延迟2 秒后报出“CURNT FDBK S”故障，因此，为了测量所有三相的电压值，这个过程可能需要反复进行数次。
13) 如果在任何一相测试中都没有检测到电压，那么说明电流转换器存在故障并需要更换。
14) 如果测试中电压正常(< 5VDC)，那么问题可能出在连接控制面板和控制板的排线上，或者控制板故障。首先更换控制板会比先打开控制面板移除排线方便的多。
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