31.42 Overcurrent fault limit
Dear Sir,
We have ACS880-37 dive controlling 275 kW pump, the VFD tripped suddenly, while we were troubleshooting, we found two blown fuses (800 A) on the VFD incomers, we tested the motor windings and the cables and every thing was ok.
My question is, what could have caused this problem, I mean that the VFD should protect itself from overload, so it is not possible that the drive consumed 800 A.
another question, I tried to put an Overcurrent limit of 500 A on the other pumps that are being controlled by similar VFDs, i set the parameter "31.42" to 500A, but the VFD gave 2310 Error (Directly after i press start) every time i tried to start it except for one time.
Than you in advance.
Abdelrazzaq Hiasat
We have ACS880-37 dive controlling 275 kW pump, the VFD tripped suddenly, while we were troubleshooting, we found two blown fuses (800 A) on the VFD incomers, we tested the motor windings and the cables and every thing was ok.
My question is, what could have caused this problem, I mean that the VFD should protect itself from overload, so it is not possible that the drive consumed 800 A.
another question, I tried to put an Overcurrent limit of 500 A on the other pumps that are being controlled by similar VFDs, i set the parameter "31.42" to 500A, but the VFD gave 2310 Error (Directly after i press start) every time i tried to start it except for one time.
Than you in advance.
Abdelrazzaq Hiasat
Asked 4 months ago
Voted best answer
1
Hi,
How did you see the parameter 31.42 - I can't find such in list of parameters?
Overcurrent trip limit is fixed/pre-programmed protection function of the drive and it should not be changed.
In case you managed to put some overcurrent limit to 500A, it is too small for 275kW (which voltage). Most probably during startup the output current is going over that limit and the drive trips due to overcurrent protection. For 273kW motor at 400V the nominal current should be somewhere 460-490A, so starup current much more.
I don't believe your input fuses are blown due to overload, if your drive is working after replacement of the fuses. You better check for phase unbalance, phase loss or other external reason. My be momentary overvoltage?
How did you see the parameter 31.42 - I can't find such in list of parameters?
Overcurrent trip limit is fixed/pre-programmed protection function of the drive and it should not be changed.
In case you managed to put some overcurrent limit to 500A, it is too small for 275kW (which voltage). Most probably during startup the output current is going over that limit and the drive trips due to overcurrent protection. For 273kW motor at 400V the nominal current should be somewhere 460-490A, so starup current much more.
I don't believe your input fuses are blown due to overload, if your drive is working after replacement of the fuses. You better check for phase unbalance, phase loss or other external reason. My be momentary overvoltage?
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