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  1. fiaz1404

    fault 7583 on Abb drive ACS-880

    There is a fault 7583 on Abb drive ACS-880. Aux code of fault is 0000 2E0B.DC fuses have been checked according to recommendation of manual, Fuses are OK. What are other possible causes of this fault. Fault description is attached
  2. fiaz1404

    variation in speed and amperes of Siemens perfect harmony drive

    Thanks to LioneIHutz and all participants in this discussion. I did auto-tuning and didn't face problem since more than a month.
  3. fiaz1404

    variation in speed and amperes of Siemens perfect harmony drive

    Automatic cell bypass feature is optional in perfect harmony drive; this feature is not available in our installation. When this problem rises, there is no any alarm or fault message appears on the drive HMI
  4. fiaz1404

    variation in speed and amperes of Siemens perfect harmony drive

    Thanks all for your valuable inputs This drive is receiving one fixed analogue input as speed reference from central control station which is only changeable manually by operator. There is no any PID control involve in operating station. There are two types of internal PID control loops...
  5. fiaz1404

    variation in speed and amperes of Siemens perfect harmony drive

    Dear itsmoked, 1. It is Induced draft fan which is responsible for flow of necessary gases from kiln to exhaust fan in cement plant. 2. I will check if drive is running a PID 3. if drive is running on PID,What are the possible causes of PID loop out of tune?
  6. fiaz1404

    variation in speed and amperes of Siemens perfect harmony drive

    We have ID fan equipped with 2000kw, 207 amp motor which is controlled by Siemens perfect harmony drive. Normal operational current is 110 amps and speed is 810rpm. We are facing a problem that drive amperes and speed suddenly start to vary from 75 amps to 160amps while speed varies between 800...
  7. fiaz1404

    Over current tripping on ABB ACS850 frequency drives

    Three ABB ACS850 drives installed in our facility for different applications started to trip with over current(different occasions). After ruling out the possibilities of over current due to load issues, defective motor and cables, we found that value of measuring parameter 01.07(DC-voltage) is...
  8. fiaz1404

    MED Voltage Motor - Rotor amps

    1: I think it is due to mixing of carbon brush grade; below I will try to create a scenario. In case if we replace some worn brushes with grade other than original. Suppose new brushes have high conductivity comparing to original brushes, then these new brushes will carry more current than...
  9. fiaz1404

    Oscillating current in 6300KW wound rotor motor for ball mill

    We have 6300KW, 13800V, 1194 rpm Slip ring SIEMENS MOTOR used for cement grinding ball mill. Recently while mill was in operation we noticed that current started to oscillate from 280 Amp to 320 Amp. We also observed the voltage oscillation ranging from 13.6 KV & 14 KV. Current is absolutely...
  10. fiaz1404

    soft starter tripping issue

    Try to start the motor in coupled condition with load
  11. fiaz1404

    bearing damage of 3500kw motor

    Sorry for delay in reply, Waross, Bearing was completely filled with grease when it was replaced last month, yesterday it was first time greased after bearing replacement. Electricpete, Motor rpm: 895 Motor weight 24000 kg Grease type shell alvania rl3 Freq...
  12. fiaz1404

    bearing damage of 3500kw motor

    Hello, We have 3500kw motor, NDE bearing#NU1048. Today motor NDE bearing was lubricated with approximately 40 grams grease. Type of grease was as per motor manufacturer recommendation. After twenty minutes of greasing, smoke was observed from bearing and motor was stopped immediately. We...
  13. fiaz1404

    increasing the V/F ratio

    thanks to all experts for their value able replies. fiaz ahmed
  14. fiaz1404

    increasing the V/F ratio

    waross, thanks so much for explaining well to solve the issue mechanically, again thanks. i am still stuck on v/f ratio increase because of current decrease in dol motors when supply voltage increas in plant, this decrease is upto limited increase in supply voltage. when voltage increase...
  15. fiaz1404

    increasing the V/F ratio

    before posting my question on this fourm i have idea to increase voltage or decrease the frequency in motor parameters but now I will try combination of three things 1. increase of voltage or decrease freq of motor parameters in drive. 2. increase the rated current up to 105 %. 3. increase the...
  16. fiaz1404

    increasing the V/F ratio

    yes lionel,s idea is ok as we have margin in winding temp of motor. motor insulation class is F and max winding temp during last year was 108°c. I think we can go up to class B temp rise, 130°c safely while vfd is 185 amp rated. But i want to go for v/f change option because our plant...
  17. fiaz1404

    increasing the V/F ratio

    Dear experts, We have ID fan for cement plant operation, designed for 1070 rpm and required power is 1593 kw(data is taken from fan name plate).Calculated torque requirement for this fan is approximately 14280 NM . This fan is driven by 6.6kv, 60 Hz, 1600kw, 164amp and 1196 rpm motor...
  18. fiaz1404

    broken edges of carbon brushes

    waross i have checked the wiring, it is ok.
  19. fiaz1404

    broken edges of carbon brushes

    please see attached image, where red high lighted brushes are being broken frequently.http://files.engineering.com/getfile.aspx?folder=6d82e37d-a637-483a-b62b-8ee4a9ab6b72&file=raw_mill_motor_slip_ring.JPG
  20. fiaz1404

    broken edges of carbon brushes

    we have four 3300kw, 13.8kv siemens slipring motors in a cement plant, in previous maintenance shutt down one motor was dismantled due to low stator resistance. we take out rotor from stator for stator cleaning, after cleaning motor was assembled and put the motor in service. after 15 days we...

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