How can resolve problem F0027 PU LOST Fault in ABB ACSM1 Drive ?
Cause : Connection between the JCU Control Unit and the power unit of the drive is lost.
Check the connections between the JCU Control Unit and the power unit.
If the JCU is powered from an external supply,
ensure that parameter 95.01 CTRL UNIT SUPPLY is set to (1) External 24V
I have same issues. I have checked all connections and they are properly fit. I checked the voltage on the JCU, it is 26v and I set the parameters on the HMI too. But same issues keep coming up. Pls what can I do?
@stephens-victor please share drive name plate pic and also share condition of fault coming contineously or come after some time
@stephens-victor check drive optical cable first, if cable faulty then this fault comes
- @click2electro I have changed the optical cable. Initially the drive was showing short circuit but after cleaning the igbt, the short circuit error stopped popping up. Afterwards the PU lost is coming up
@stephens-victor may be your optical incorrectly, try to interchange or check connection
This is the optic terminal of the JCU with number label. I followed same label on the JINT. Still same challenge
@stephens-victor there are 3 possible reasons
1. Either optical cable connect incorrectly or faulty.
2. May be JINT board faulty.
3. May be JRIB board faulty.
