Issue:
Recommended motor cables to use for Voltage spikes.
Product Line:
Altivar Drives
Environment:
All
Cause:
Voltage harmonics and transients.
Resolution:
Electrical phenomena on drive input is completely different than the output. On line cable,voltage harmonics is less than current harmonics
,and on drive output ,voltage harmonics is higher than current harmonics (low distortion of motor current , high distortion of voltage due to drive PWM).
For the output ,impact on copper wire is low (if section is correctly define conforming to current),but it is important to have a good isolation property for cable.
It is advice to used 1kV cable ,but it is also important to have good hi pot feature too (ie 4kV).In fact,PWM of drive generate a high dv/dt signal (about 5kV/µs) ,
with a possible overshoot / overvoltage on motor side due to signal reflection (overvoltage can be higher than 2 times of DC bus voltage) due to motor cable length.
This overvoltage can be seen by to motor terminal ,and by motor cable too.Dv/dt value will generate earth current due to earth/wire capacitance of cable (mainly with shielded cable).For motor cable
,we recommended some kind of cable like :for shielded cable : "GORSE" (GUOSTV-LS/LH) or "PROFLEX" (EMV2YSL CY) ; for unshielded cable : "GORSE" (H07 RN-F4GXX) or "BELDEN" (2950X).
It should be a good point to see with cable manufacturer to have the best referency of motor cable to operate with drive.
Recommended motor cables to use for Voltage spikes.
Product Line:
Altivar Drives
Environment:
All
Cause:
Voltage harmonics and transients.
Resolution:
Electrical phenomena on drive input is completely different than the output. On line cable,voltage harmonics is less than current harmonics
,and on drive output ,voltage harmonics is higher than current harmonics (low distortion of motor current , high distortion of voltage due to drive PWM).
For the output ,impact on copper wire is low (if section is correctly define conforming to current),but it is important to have a good isolation property for cable.
It is advice to used 1kV cable ,but it is also important to have good hi pot feature too (ie 4kV).In fact,PWM of drive generate a high dv/dt signal (about 5kV/µs) ,
with a possible overshoot / overvoltage on motor side due to signal reflection (overvoltage can be higher than 2 times of DC bus voltage) due to motor cable length.
This overvoltage can be seen by to motor terminal ,and by motor cable too.Dv/dt value will generate earth current due to earth/wire capacitance of cable (mainly with shielded cable).For motor cable
,we recommended some kind of cable like :for shielded cable : "GORSE" (GUOSTV-LS/LH) or "PROFLEX" (EMV2YSL CY) ; for unshielded cable : "GORSE" (H07 RN-F4GXX) or "BELDEN" (2950X).
It should be a good point to see with cable manufacturer to have the best referency of motor cable to operate with drive.
發佈於: 施耐德電機Taiwan
