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The motor is being run with Mentor II drive with a seperate field controller and we can only can give current value in the parmeters which adjusted voltage itself to maintain the set current till base speed. If the motor is running above base speed(which is usually the case) a sudden increase...

It varies from 240 to 278 depending upon the field winding temperature. In the morning I have figure it out that 16 amperes were actually the rated current by the following procedure. I set the current at 16 amperes and gradually increasing the motor rpm and measuring both field current and...

dear Waross we have this motor having 950kw, armature voltage 600 dc, field voltage on nameplate is 250vdc, the motor is being run with Mentor II drive with field current controller the field current was set to 16 amperes by the time of its commissioning some 15 year ago.And recently we were...

thank you for this information it sure has helped me in determining the rated field current of the above motor.Which I have calculated as 18.5 amperes while earlier it was set at 16 amperes and sure was one of the reasons for producing less than the rated torque.But I still want to be sure if it...

Thank you but at what temperature? As the impedence increases with temperature.We may have different reading at different temperature so what is the standard temperature in determining field impedence?

Good afternoon everyone I need to determine the rated field current of a seperately excited dc motor? while the field voltage mentioned on the name plate is 250 volts dc. Below are the Motor's Nameplate Data. Rotor rated voltage:600 dc Base speed:500 Rpm Rated current:1632 amperes Rated Power...

thanks a lot for your guidance let you know when through with the suggested procedure.

thanks Skogsgurra for your reply the motor is more than 15 years old and probably that is the reason i could not get the required information can you tell me from where i can get Instruction GEH-709 indicated in the nameplate information above? It seems to me that the motor is not being utilized...

We have a bar rolling mill where a dc motor of following specs is being used while the drive for the same is Mentor II (M1850). General Electric Direct current motor No. 2321820 Type MCF HP 1250 RPM 500/910 Form_______ Volt 600 Amp 1632 Exc Volt 250 Wound______ Commutator 55OC Insulation...

Dear all we have a separately exited dc motor in our bar rolling mill with following nameplate in formations. The nameplate of finish mill Dc motor is as follows:   General Electric Direct current motor No. 2321820 Type MCF HP 1250 RPM 500/910 Form_______ Volt 600 Amp 1632 Exc Volt 250...

Dear guys The problem have been resolved by changing a minor alteration in the control circuit earlier we were interrupting the ready command of the phase control unit which in turn interrupt the output currrent.And now we are interrupting the reference command of the drive which has resolved...

Should we include a line reactor to limit the current spikes?

I have a similar machine in my plant and a couple of weeks ago an SCR module was burnt on that machine and I replaced the same module I am using in the above machine & there is no such issue.So I checked its snubber circuit may be we have not calculated it correctly.

I have a similar machine in my plant and a couple of weeks ago an SCR module was burnt on that machine and I replaced the same module I am using in the above machine & there is no such issue.So I checked its snubber circuit may be we have not calculated it incorrectly.

There is an snubber circuit on the SCRs but later I have not checked if they are intact

Dear Guys I am working on Magnetic particle inspection machine where the maximum out put current is 3000 ampere at approximately on 15 volts ac while the input voltages are 400 volts two wire.The same is being done with a transformer where the prim voltage is 400 and the output voltages are 15...

a very valid point by Krsh.

may be you have forgotten to auto tune the inverter which usually cause drawing large currents.

thanks, it is for measuring the dc motor current,yes the voltage level is relatively high i,e 700 volts and we will take the neccessary precautions. regards

Dear guys how many devices can be connected to a dc shunt for protection and monitoring without too much compromising on accuracy, assuming the input impedences are very high? The dc shunt specs are 100mv at 3000 amperes. regards