defcon.klaxon
Lifetime Supporting Member
Hey guys,
Today I've had some VFD faults occur with some pumps as I've been doing some testing. I'm trying to figure out the cause and think I might have found it, but I'm looking for a sanity check.
The VFDs I'm working with are GE AF-600 models. The fault code I'm getting when the pumps are at 100% speed is "Output Frequency at Maximum Limit". If I back the speed down a bit, the fault goes away.
I went through the parameters for the motor; motor voltage is 460V, current is 18.5A, horsepower is 15, all that looks good. The odd thing is the "base speed" setting, though. Right now the base speed on both VFDs is set to 1728 RPM. I don't exactly know where that number came from, I'm not the one who set up the VFD. If I check the nameplate on the motor itself, there's an HP field that says 1175. On the bottom half of the nameplate under a big title of "Inverter Duty" it states that the Hz range of the pump is 6-60 and the RPM is 120-1200.
I'm thinking in the VFD, my min speed should be 6 Hz instead of 0, and the base speed shouldn't be 1728 RPM, it should be 1175 or maybe 1200. Does this sound reasonable to anyone? Am I way off base?
Thanks!
UPDATE: drive two's max frequency is set to 120Hz, while drive one's max frequency is 60Hz. Base frequency of both pumps is 60Hz. drive two isn't having issues at full speed, so is that 120Hz setting correct in this application? Should I make max frequency a slightly higher number rather than double the base frequency?
Today I've had some VFD faults occur with some pumps as I've been doing some testing. I'm trying to figure out the cause and think I might have found it, but I'm looking for a sanity check.
The VFDs I'm working with are GE AF-600 models. The fault code I'm getting when the pumps are at 100% speed is "Output Frequency at Maximum Limit". If I back the speed down a bit, the fault goes away.
I went through the parameters for the motor; motor voltage is 460V, current is 18.5A, horsepower is 15, all that looks good. The odd thing is the "base speed" setting, though. Right now the base speed on both VFDs is set to 1728 RPM. I don't exactly know where that number came from, I'm not the one who set up the VFD. If I check the nameplate on the motor itself, there's an HP field that says 1175. On the bottom half of the nameplate under a big title of "Inverter Duty" it states that the Hz range of the pump is 6-60 and the RPM is 120-1200.
I'm thinking in the VFD, my min speed should be 6 Hz instead of 0, and the base speed shouldn't be 1728 RPM, it should be 1175 or maybe 1200. Does this sound reasonable to anyone? Am I way off base?
Thanks!
UPDATE: drive two's max frequency is set to 120Hz, while drive one's max frequency is 60Hz. Base frequency of both pumps is 60Hz. drive two isn't having issues at full speed, so is that 120Hz setting correct in this application? Should I make max frequency a slightly higher number rather than double the base frequency?
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