MICROMASTER

Parameter adjustments to overcome high starting torque of pump motor

Thread Starter: Shane Byars   Started: 7/20/2012 1:48 PM   Replies: 2

  7/20/2012, 1:48 PM

Shane Byars Joined 7/17/2012 Last visit: 2/4/2013 Posts: 1 Rating:  (0)

(0)  We are attempting to use a MM440 to drive a PD lobe pump. This pump has a characteristic high starting torque as compared to a centrifugal. When starting the pump motor the output shaft cogs and does not make one complete revolution. We then performed a "Motor Identification" via Starter and noted changes in Parameters 350 and 352 after the routine. We then modified P320 from 0 to 50, P346 from 0.117 to 1.0 and P1312 from 0 to 150. After doing this the motor would turn the pump. The parameter adjustments were suggestions from a Siemens tech support rep. What precisely is the proper way to commision a MM440 for operation with a high torque starting load? We have reviewed section 6 of the MM440 guide and followed these procedures. The motor is 2HP/2.5A rated inverter duty. Using a Fluke clamp ammeter we see an output of around 2.6A. The AOP indicates an output of 2A. What exactly is the "Magnetization current"?

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  7/20/2012, 2:06 PM

Marcjan Joined 4/22/2010 Last visit: 5/24/2013 Posts: 3213 Rating:  (295)	(0)  Shane Byars wrote:  What exactly is the "Magnetization current"? That is the  No Load current measured by the drive in autotune mode. Regards, Marcjan            Problem solved? Please let us know! Please no technical questions by PM, use the forum!
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  8/14/2012, 9:19 AM

sparten Joined 8/2/2011 Last visit: 5/21/2013 Posts: 96 Rating:  (4)	(0)  what is value of parameter p1300??????if possible then for pump app. make it p1300=2.....then after your problem not solve thrn try to run drive in SLVC mode p1300=20 make speed optimization p1960=1.........
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