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6RA70 -SPEED VARIATION AT ARMATURE VOLT 220V

12/21/2012 5:37 AM	Rate (0)
eshwar Posts: 46 Rating: (0)	Hello Every one please guide me iam facing speed varation problem in 6ra70 dc drive iam using 6ra70 dc converter simoreg 400amps, field current 25 amps , for 75kw dc motor rated armature amps 188amps, filed current 5.9amps, i have setted all commission parameters including load reduction at p076 for both armature current and filed current and done current optimization, and i have run the motor, the speed is smooth upto 210v armature dc voltage, upto 600rpm the motor is smoothly running but after speed increasing above 650 rpm the motor speed varies, as well as current variation, i have setted p 225 and p 226 parameter but drive is not setting so please guide me regards eshwar
eshwar Posts: 46 Rating: (0)
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12/21/2012 11:25 AM	Rate (0)
PISCEAN 2010 Posts: 8092 Rating: (884)	Hello, Have you carried out Speed optimisation? What type of feedback device is used? tachogenerator or pulse encoder? Does motor runs in field weakning mode? Please provide complete motor name plate details. Please can you provide following parameter values, P076.001, P067, P076.002, P078.001, P78.002, P100..to ... P109, P083, P741, P083, P140
PISCEAN 2010 Posts: 8092 Rating: (884)	Last edited by: PISCEAN 2010 at: 12/21/2012 11:59 AM
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12/21/2012 12:54 PM	Rate (0)
eshwar Posts: 46 Rating: (0)	dear sir, i have done optimisation p051- 25 by locking the motor and also speed optimisation p051-26 during optimisation no fault detected. iam using tachogenerator as feedback motor name plate details 75kw dc motor, armature amps-188, field amps- 6.1 amps, rpm- 1500 rpm, armature voltage- 440V field voltage- 220V P076.001 - 40.0 P067 -1 P076.002 - 33.3 PO78 - 400 P100 - 188 P101 - 440 P102 - 6.10 P103 - 0.00 P104 - 1500 P 105 - 0.1 P106 - 5000 P107 - 0.1 P108 - 1500 P109 - 0 P083- 1 P741 - 75.00 P140 - 0 Iam using tacho generator rated 4000rpm/ 200v. i have not check filed weakening mode because it is not necessary i just want to run the motor at 1500 rpm.
eshwar Posts: 46 Rating: (0)
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12/21/2012 2:40 PM	Rate (0)
nik_ant Posts: 24 Rating: (1)	Try to optimise it manually!
nik_ant Posts: 24 Rating: (1)
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12/22/2012 5:28 AM	Rate (0)
eshwar Posts: 46 Rating: (0)	dear nik can u please guide me how to optimise manually
eshwar Posts: 46 Rating: (0)
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12/28/2012 1:47 PM	Rate (0)
eshwar Posts: 46 Rating: (0)	dear sir, ihave tried manual optimization, but same problem so please guideme.
eshwar Posts: 46 Rating: (0)
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1/2/2013 8:35 AM	Rate (0)
PISCEAN 2010 Posts: 8092 Rating: (884)	Hello Eshwar, P105 & P107 values set in your case are default values = 0.1A Please check. Those are wrong values. Can you attach the motor nameplate details here so as to help you to identify the correct values. Moreover from the data provided by you P076.001 works out to be 47% & P076.002 works out to be 24.4% Please check & confirm. Also P 109=0, you have deactivated speed depedent current limit. P103= 0 i.e. minimum field current. Can you attach complete parameter list along with motor & converter nameplate details? Hope this helps you.
PISCEAN 2010 Posts: 8092 Rating: (884)	Last edited by: PISCEAN 2010 at: 1/2/2013 8:39 AM
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