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Current check in servomotor

Created by: sagar k. at: 8/23/2011 9:20 AM (9 Replies)

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8/23/2011 9:20 AM	Rate (0)
sagar k. Posts: 25 Rating: (0)	We have using 840D controller with PCU 50, 6 axes is controlled form it.Servomotor axes-3Nos & Proportional valve (hydraulic) axes- 3Nos.Now we want to check current of servomotor which connected from-1) POWER SUPPLY MODULE LT-MODULINT.160A, (6SN1123-1AA00-0EA2) 2) MICROPROCESSOR MODULE, (6SN1118-0DJ21-0AA1). & 3) Servomotor motor details is- 1FK7105-5AF71-1EA0,So please explain how to check full load current of this motor during running.ThanksSagar k.
sagar k. Posts: 25 Rating: (0)
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8/23/2011 10:21 AM	Rate (0)
Ekalavya Posts: 2964 Rating: (484)	Hello.... On your Servcie Display you have some thing called Smooth Current actual value...check this tells you the motor utilization. Regards, Prakash
Ekalavya Posts: 2964 Rating: (484)
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8/24/2011 6:04 AM	Rate (0)
PISCEAN 2010 Diamond Expert Joined: 4/23/2010 Last visit: 11/23/2024 Posts: 8092 Rating: (881)	Hello, Check this. Menu select>start up>machine data>drive MD>Select related axis>search = 1719 = Actual motor current rms. Deep.

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8/29/2011 12:31 PM	Rate (0)
sagar k. Posts: 25 Rating: (0)	Sir Thanks for replay I was checked parameter 1719 (current absolute actual value) 1) Motor disable current value is :- MD1719 = 0 A 2) Normal auto running operation- MD1719 = 15.64 A 3) Maximum loadding condition value is:- MD1719 = 63.56 A &. Parameter 1708 (smoothed current actual value) 1) Motor disable current value is :- MD1708 = 0 % 2) Normal auto running operation- MD1708 = 13.55 % 3) Maximum loadding condition value is:- MD1708 = 53.25 % But my problem is that which is motor running current ifMD1719 shown 63 A current max, & MD1708 shown 53 %, Motor actual current on motor nameplate is In- 16 A, Io- 32 A. (23 Nm)
sagar k. Posts: 25 Rating: (0)
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8/29/2011 1:20 PM	Rate (0)
PISCEAN 2010 Diamond Expert Joined: 4/23/2010 Last visit: 11/23/2024 Posts: 8092 Rating: (881)	Hello, The data of motor, based on MLFB no (1FK7105-5AF71-1EA0) you have specified is as below. 48 Nm, In= 18A, Power=8.17 Kw, RPM = 3000. When you move the axis, check MD1719 which shall display the actual value of current in RMS. Hope this helps. DEEP.

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8/29/2011 1:59 PM	Rate (0)
sagar k. Posts: 25 Rating: (0)	Thanks sir (DEEP) Yes you are currect motor details is :- 48 Nm, In= 18A, Power=8.17 Kw, RPM = 3000. So what will be the maximum current of this motor. Sagar k.
sagar k. Posts: 25 Rating: (0)
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8/29/2011 3:04 PM	Rate (0)
PISCEAN 2010 Diamond Expert Joined: 4/23/2010 Last visit: 11/23/2024 Posts: 8092 Rating: (881)	Hello, Servo motor current depends upon lot many factors. However please find attached here with the data sheet of the said motor. From the sheet you can understand the max current applicable at correspondence duty cycle. Hope this will help you. DEEP. Attachment Data sheet 1FK7105.pdf (162 Downloads)

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8/31/2011 8:05 AM	Rate (0)
sagar k. Posts: 25 Rating: (0)	Sir, It is possible to fail (motor winding over heat problem)servomotor because of over loading during clamping (travel to fixed stop), there is any current limit protection in parameterisation in that perticular axis. BecauseWe have increasing motor torque during clamping operation for proper positioning of job. Thanks sagar
sagar k. Posts: 25 Rating: (0)
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8/31/2011 9:13 AM	Rate (0)
PISCEAN 2010 Diamond Expert Joined: 4/23/2010 Last visit: 11/23/2024 Posts: 8092 Rating: (881)	Hello, I have never seen any servo motor failed because of winding failure due to overload.By Siemens,it is so superbly built & have protection features that it will not burnt because of overloading or temperature increase. It is well protected from drive side with current & torque limits. For temperature rise, motor has inbuilt thermister to sense winding temperature which in turns protects motor from thermal heating. (All this is true provided, proper engineering of motor & drive designe is worked out & implemented. Also entry of coolant or some foreign fluid which in turn may short winding & may cause motor failure. But I am sure that for this manufacturer or designer should not be held resposbile.) Please see the file attached here with for thermal motor protection. DEEP. Attachment Servo motor thermal protection..pdf (186 Downloads)

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8/31/2011 2:47 PM	Rate (0)
sagar k. Posts: 25 Rating: (0)	Thank you sir
sagar k. Posts: 25 Rating: (0)
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