Failure analysis of Mitsubishi Frequency Converter OC1 and OC3
Published:2023-01-10 16:21:09
Many times when Mitsubishi frequency converter presents OC (overcurrent problem), it is caused by the following reasons. Take A500 series frequency converter as an example:
1) Caused by improper parameter setting, such as too short time setting.
2). Caused by external factors, such as motor winding short circuit, including interphase short circuit, short circuit to the ground, etc.
3) Inverter hardware faults, such as Hall sensor damage, IGBT module damage, etc.
In maintenance, sometimes excluded these reasons may still be to solve the problem, OC fault still exists, of course, the replacement of the control board is not the solution to the problem, then we can consider whether there is a problem in the drive circuit. The detection circuit of Mitsubishi A500 inverter is quite powerful. As long as there is a problem at any of the above detection points, it may alarm and fail to operate normally. In addition to the general drive circuit includes the drive power supply, drive optocoupler isolation, drive signal method circuit, but also includes the output signal feedback circuit. The detection direction primarily includes several components of the Mitsubishi drive circuit.
-
202303-08Cause of frequent trip of Schneider leakage switch
1. Bad deviceEach pile lead wire is not firmly connected, long-term loose, will cause the pile head heat, oxidation, burn the outer insulation of the wire, and announce the spark and coke taste, the f···
-
202302-13Mitsubishi PLC source type and leakage type difference
Mitsubishi PLC split source type (PNP) or leak type (NPN), the following is their difference1: Leaky logic: When current flows out of the signal input terminal, the signal changes to ON, indicating le···
-
202307-07The alarm code cause and diagnosis method of the cabinet air conditioner of Rittal
Alarm code: A01System message: Open the cabinet doorAir conditioning cause: The opening and closing position is incorrectDiagnostic method: Check the transition position of the door and, if necessary,···
-
202304-21Fault detection methods for Omron relays
Fault detection Method One1. You can first check whether the voltage of the Omron relay is high or low. Generally, the maximum voltage is between 180V and 240V.Fault detection Method two2. In addition···
-
202303-03MCGS touch screen 485 communication precautions
1. Variables in the real-time runtime cannot simultaneously add channels and use functions to send data.2. In the parent device of the universal serial port, COM port indicates 232 or 485. In touch, C···
010-64225983
+8613811814778
info@zhongpingtech.com
Building 26, Liyuan Community, Chaoyang District, Beijing, China