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FAN ON -OFF

5/19/2012 11:07 AM	Rate (0)
ALGUDKAR RAO Posts: 621 Rating: (10)	Hi all here is MM440 vfd is control wiring and all done the on command is given through HMI but im get confusing if i stop the command and speed referance AI 4-20ma.if i remove one cable from AI without giving any on command why VFD is fraction of second fan is ON and OFF.why can any one having this idea regards algudkar
ALGUDKAR RAO Posts: 621 Rating: (10)
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5/19/2012 11:22 AM	Rate (0)
sparten Posts: 205 Rating: (11)	Hi algudkar, tell me what is frame size of your mm440 vfd?????
sparten Posts: 205 Rating: (11)
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5/20/2012 2:31 PM	Rate (1)
Graeme Platinum Expert Joined: 6/4/2008 Last visit: 8/5/2025 Posts: 1518 Rating: (327)	Hi, are you sure that you are giving the full OFF command, removing a wire from the Analog input can make it go to full scale before either fault occurs, or internal OFF command is issued. I will try this on my MM4, so I will stop the drive using ON/OFF1 (P840), disable?? the analogue setpoint, (P1070) and then remove a wire from the analogue input (Does it matter which?) What I don't get is that Nothing (NOTHING) should start the drive (or Fan) until the ON/OFF1 command is edge triggered. The Fan only runs when pulses are enabled. Regards, Graeme

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6/30/2015 1:26 PM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4759 Rating: (122)	New question published by PhilSiemens1 is split to a separate thread with the subject MM440, Fan problem. Best regards Min_Moderator

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