TheDude_Abides
Member
We've got a powerflex 40 running a 7.5hp blower motor. I have the parameters set for a ramp up time of 8 seconds and a coast to stop at 10 seconds. The operators know not to change the pot and that its to remain at 36.1hz. Faulted out on 2nd shift. The start circuit is fed off the power supply of the drive running through a set of NO contacts on an ice cube relay with a 120v coil. The switch is a maintained two position. No start/stop. Just an On/off. The On/off switch controls the coil on the relay. The relay controls the 24v to the drive for the start circuit as well as the 120v for the coil on the blower contactor where a diode is installed to protect the relay. The overload is set at 15 amps, I also have a set of fuses local to the blower in a disconnect at 15amps as well.
I know this is probably more info than is needed but as an electrician I like to see the whole picture when troubleshooting. Any ideas on what would cause this? I don't have a surge suppressor installed in the panel. But if it says that its a bus over voltage then it doesnt sound like a control circuit problem.
The manual says: Monitor the AC line for high line voltage or transient conditions. Bus overvoltage can also be
caused by motor regeneration. Extend the decel time or install dynamic brake option
I know this is probably more info than is needed but as an electrician I like to see the whole picture when troubleshooting. Any ideas on what would cause this? I don't have a surge suppressor installed in the panel. But if it says that its a bus over voltage then it doesnt sound like a control circuit problem.
The manual says: Monitor the AC line for high line voltage or transient conditions. Bus overvoltage can also be
caused by motor regeneration. Extend the decel time or install dynamic brake option