Saturn_Europa
Senior Member
- Location
- Fishing Industry
- Occupation
- Electrician Limited License NC, QMED Electrician
I am helping a colleague at a different facility troubleshoot a problem with a Flottweg Decanter. Its a remote facility with its own power generation.
The drive specifics:
ACS880 -01-124A-5
3PH, 380-500V
124A
75KW/100HP
FRAME 6
VAR jumpers to Ground have been pulled.
Attached drawings do not show line reactor. But there's one installed.
The original drive failed during operation. The electrician onsite, megged out the motor, which passed. The drive is powered thru its own fuses, thru a contactor that is latched in by a safety relay, then thru a line reactor.
The UDC + and UDC- are connected to a Power Ohm breaking module (with an external resistor) and UDC + and UDC - are connected to a 684 DC to 24 DC converter to a redundancy module for the 24v control voltage (Ive only seen this set up in Flottweg panels).
He installed a spare VFD that he had onsite. It would not power up. He checked voltage at the input side of the drive. 485v AC phase to phase and 278, 280 and 286 phase to ground.
The onsite electrician, checks the line reactor and everything looks good. Does an electrical tightening of the cabinet. Checks out the contactor then gets out the other brand new spare VFD.
He hooks it up to temporary power, the VFD powers up and he programs it. Then he installs it in the cabinet and only hooks it up to incoming line power. No control wiring and the UDC not hook up to the power ohm or anything else. Drive does not power up. Checks voltage at terminals. Voltage is good.
He takes the drive out and installs it on temporary power. The drive will not power up. He checks the charging resistor on the VFD and it reads OL. He puts a scope on the power in the cabinet and everything is good. Pulls out smaller Leeson VFD for a different application he has and installs it in the cabinet. It powers up.
The electrician onsite then gets a spare from my facility. Its a very new spare and has not been in storage for long. He installs it with all control power, load and line and breaking resistor hooked up. It powers up. He programs it and gets everything buttoned up. When the power is cycled the drive is dead and will not work.
The decanter has burned thru 4 drives.
Power tests good.
Line reactor test good.
Fuses are good.
Contactor doesnt chatter and pulls in once.
I am not onsite.
The only thing I can think of is that the line reactor is bad and he cant id the problem with it with a multimeter and a megger and its frying the drives for some reason.
I think the next step is to replace the contactor, the fuses, and the line reactor.
Has anyone ever seen anything like this?
The drive specifics:
ACS880 -01-124A-5
3PH, 380-500V
124A
75KW/100HP
FRAME 6
VAR jumpers to Ground have been pulled.
Attached drawings do not show line reactor. But there's one installed.
The original drive failed during operation. The electrician onsite, megged out the motor, which passed. The drive is powered thru its own fuses, thru a contactor that is latched in by a safety relay, then thru a line reactor.
The UDC + and UDC- are connected to a Power Ohm breaking module (with an external resistor) and UDC + and UDC - are connected to a 684 DC to 24 DC converter to a redundancy module for the 24v control voltage (Ive only seen this set up in Flottweg panels).
He installed a spare VFD that he had onsite. It would not power up. He checked voltage at the input side of the drive. 485v AC phase to phase and 278, 280 and 286 phase to ground.
The onsite electrician, checks the line reactor and everything looks good. Does an electrical tightening of the cabinet. Checks out the contactor then gets out the other brand new spare VFD.
He hooks it up to temporary power, the VFD powers up and he programs it. Then he installs it in the cabinet and only hooks it up to incoming line power. No control wiring and the UDC not hook up to the power ohm or anything else. Drive does not power up. Checks voltage at terminals. Voltage is good.
He takes the drive out and installs it on temporary power. The drive will not power up. He checks the charging resistor on the VFD and it reads OL. He puts a scope on the power in the cabinet and everything is good. Pulls out smaller Leeson VFD for a different application he has and installs it in the cabinet. It powers up.
The electrician onsite then gets a spare from my facility. Its a very new spare and has not been in storage for long. He installs it with all control power, load and line and breaking resistor hooked up. It powers up. He programs it and gets everything buttoned up. When the power is cycled the drive is dead and will not work.
The decanter has burned thru 4 drives.
Power tests good.
Line reactor test good.
Fuses are good.
Contactor doesnt chatter and pulls in once.
I am not onsite.
The only thing I can think of is that the line reactor is bad and he cant id the problem with it with a multimeter and a megger and its frying the drives for some reason.
I think the next step is to replace the contactor, the fuses, and the line reactor.
Has anyone ever seen anything like this?
