Monarch NICE7000 - Wiring When Using the Special Contactor; Independent Contactor + Relay NC Contact

NICE7000 User Manual 5 System Commissioning and Functions
- 91 -
Due to the poor quality of the contactor and the wiring of adding the auxiliary contact, the
residual current of the controller is still high when the outputs UVW are shorted at abnormal
stop. This results in an over-current fault and may damage the controller or motor.
Monarch recommends two schemes which have better effect.
1) Special contactor with shorting PMSM stator function
2) Independent contactor + Relay NC contact
1) Special contactor with shorting PMSM stator function
The MG-BF series contactor produced by Tianjin the Second Relay Factory is used. This
contactor provides the shorting PMSM stator function itself, featuring safety, reliability and
easy wiring.
Figure 5-9 Wiring when using the special contactor
Y1
M1
102
132
U
V
W
NICE7000
M
SW: RUN contactor
SW
Motor
U
V
W
1 2
3 4
5 6
Safety circuit
C
R
2) Independent contactor + Relay NC contact
An independent contactor for implementing the shorting PMSM stator function is used.
The shorting PMSM stator function is implemented via the relay NC contact.
On the coil circuit of the RUN contactor, an NO contact of the contactor is connected in
serial, to ensure that output short circuit does not occur when the parameter setting is
incorrect.
The following gure shows wiring of this scheme.