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  • Users: mash98
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  1. mash98

    Determining Field current of seperately excited Dc Motor

    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...
  2. mash98

    Optimizing DC drive Bar rolling application

    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...
  3. mash98

    required detail specs of GE 950 kilo watts dc motor

    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...
  4. mash98

    high inrush current during turning off

    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...
  5. mash98

    Measuring devices connect to a Dc Shunt

    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
  6. mash98

    Large DC Motor Tripping current

    Dear guys we have a dc motor with the following Specs. Rated KW: 1000 Rated Volt: 700 Rated Ampere: 1700 Frequent Max Current: 225%/Min of rated(mentioned on original electrical Drawing) E Max current: 275%/Min of rated(mentioned on elect drawing) RPM : 30/80 Exitation : Seprate Rated...
  7. mash98

    Maintenance Manual Of Siemens Simoreg

    Dear guys we have a an old lathe machine fitted with siemens's Simoreg dc drive with following model/type. Type 6RA 2625-6MV30-0. Recently we are having problem in the drive and unfortunately its maintenance manual has been lost. Can somebody help me in getting its maintenace manual on the net...
  8. mash98

    Replacing A High speed Dc Air circuit breaker with VCB

    Dear guys we have a dc motor with a capacity of 1000 kw with following specs. - Rated Voltage : 700 vdc - Rated current : 1700 Amperes - Type : Seperately excited -Drive System : Motor generated set( sure its an old system but nevertheless useful) with 4th quadrant control, the motor...
  9. mash98

    REGENERATIVE ENERGY WHILE BRAKING BY VDF

    Dear guys yesterday I have seen an equipment which sends back the regenerrative energy while braking through VFD back into the system, although it is very common in 4th quadrant dc drive application but strangely the same is not very popular in vfd.Can you guys tell me about the pros and cons of...
  10. mash98

    Modification in my shearing machine Magnet

    Dear guys we have a 50 kg magnet on our shearing machine.The electrical statistics of the same are as under. - Voltage 400 3phase 50 hz connected in delta. - Peak current 160 amperes( measured by clamp meter with peak holding option) which is for some very short time i.e for some milliseconds I...
  11. mash98

    Runnig a 230volt motor on 4oo volts

    Dear guys we have some motors which were originally winded on delta with a rated voltage of 230 vlots 3 phase but our winder has changed the motor's internal connection to star( using the same original winding wire) so we can run the same on 400 volts to meet our system requirements.The motors...
  12. mash98

    Changing ac voltage to dc voltage in mgnetic coil

    Dear guys we an electromagnet with ac coil having 400 volts/50 hertz while the same magnet draws one ampere current.This magnet consist of six coils connected in star.The Dc impedence of each coil is 9.5 ohms.Now I intent to connect the above same six coils in series so I will get roughly 57...
  13. mash98

    Gen Size For A 100 Hp motor

    We have a 275kva stand by generator and it doesn't start a 100hp pump motor having DOL starter.Can I connect the motor directly to the generator and than start it? as I have read somewhere that this method can be successful if any member have an experience of such starting kindly let me know...

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