Question about Danfoss Sundstrand-sauer-danfoss Sundstrand Hydraulic Pump
I have 4 Danfoss FC202 VFT drives and they behave the same during commissioning time with following problems:
(1)When stating the drive from digital input with a preset reference (40Hz)the drive starts up, frequecy and voltage ramping up, but the voltage just stop ramping up at around 30Hz, and over-current alarm occurs. The drive keeps running but stays at that voltage and frequency, cannot get to speed reference.
If i stop the drive and re-start it a few time, then it will go through that locking voltage and running at speed successfully.
(2)The same thing happens when i start the drive with speed reference from DeviceNet. In this case, the speed reference is varied (PID controlled from PLC) and never have a succesful start like the fixed speed as (1)
Can yo give me an advice on this since changing the ramping up time does not help.
I didn't see what these drive application was for. Is it for a fan or pump?
I assume you've entered all the motor data, FLA, RPM Voltage, KW etc. If you have three of these you must have experience with these drives. I've only used these drives on fans, and once on a pump.
Have you tried the Automatic Motor Adaptation ? (AMA) Have you programmed the PID start speed? Read the note about this feature as I think you have to have min speed set at 0 .I know you said you tried changing the ramp up time. If this is on a pump, the ramp up time may be too slow causing the motor to draw too much current when it's pumping way down on the pump curve. People would have a tendancy to make the ramp up time loonger, to make the load easier to start, however the torque requirement on a slower speed could be so high, the motor is overloading. I'd like to know what you find out, pleas post your solution. Have you contacted Danfoss or your local rep?
Posted on Jul 07, 2010
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Posted on Jan 02, 2017
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