Induced Voltage in Control cable
Induced Voltage in Control cable
(OP)
We are planning to use LV motor starter of a certain make which has an electronic unit utilising 24VDC as the control voltage. Now we have long lengths of control cable from MCC to Local Control station with control cable running parallel to the 600V power cable. Is there any calculation to show the limiting length of control cable before induced voltage cause spuriuos operation of starter? Also if VFD driven motors also have power cables running in the same tray, will this aggravate the problem? I believe using twisted shielded pair control cable may mitigate the problem. Is spatial seperation also required? I believe a certain IEEE code on induced voltages in cables has been archived!





RE: Induced Voltage in Control cable
VFD leads always need to be run in seperate conduit, even if you have two vfd for two motors, run the wiring for each motor seperate. Or you can use shielded multiconductor cable and put these in the tray and this should work.
If your using tray, you can get the trays that have a metal seperation for low voltage and high voltage. I have used these before for separating 24vdc and 480vac and have been successful with the results (no noise problems).
RE: Induced Voltage in Control cable
RE: Induced Voltage in Control cable