Crompton Controls 3DPM1CHS/10 - Manual (Page 14)

14
Fault finding
Check power to L1 L2 supply to module - volt meter check 1.
Supply to terminal 17 control fuses and wiring - volt meter check 2.
Relay closed internally linking 17 to 18 module fault if doesn’t close
- volt meter check 3.
Check voltage signal to B2 – fed from auxiliary contact block on the
main contactor - volt meter check 4.
Application of voltage causes no change however removal of voltage
triggers the braking.
Check voltage on 28 to ensure internal relay operating - volt meter
check 5.
Wiring from M1 M2 to motor – Isolate supply test with meter on
resistance across M1 M2 when operating the BC brake contactor by
hand should be able to measure the winding resistance - resistance
check 6.
Motor connections for star delta.
DC injection fuse.
Faulty contactor.
Wiring fault.
Module fault.
If semiconductor fuses are not fitted and high currents result from
earth faults.
If voltage setting is too large for the motor impedance.
If Interlocks incorrectly wired and AC and DC contactors operate at
the same time.
Initially check for loose connections and physical damage
Not Starting
Brake contactor
not operating
Brake Contactor
operating
but not braking
Module tracks
can be damaged