4-4 Power Wiring
MN762
Unexpected faults may occur due to excessive charging current required for motor cable capacitance. If you use long
motor leads and experience unexpected trips due to current overload conditions and are not sure how to correctly size and
connect the optional load reactors, please contact your Baldor District representative. Baldor is always glad to assist.
4.4.7 M-Contactor Connections
If required by local codes or for safety reasons, an M-Contactor (motor circuit contactor) may be installed. However,
incorrect installation or failure of the M-contactor or wiring may damage the control. If an M-Contactor is installed,
the control must be disabled for at least 200msec before the M-Contactor is opened or the control may be damaged.
M-Contactor connections are shown in Figure 4-3.
CAUTION:
If an M-Contactor is installed, the control must be disabled for at least 200msec before the M-Contactor
is opened. If the M-Contactor is opened while the control is supplying voltage and current to the motor,
the control may be damaged. Before the control is enabled, the M-Contactor must be closed for at least
200msec.
Figure 4-3 Motor Connections and Optional Connections
*
Optional components not provided with control.
Baldor
Control
*
AC Motor
Note 1
*
Optional
Load
Reactor
Note 1
A1
B1
C1
A2
B2
C2
U
V
W
U
V W
G
Note 3
*
Optional
RC Device
Electrocube
RG1781-3
* M Enable
*
M-Contactor
To Power Source
(Rated Coil Voltage)
M=Contacts of optional M-Contactor
GND
*
Optional M Contactor Connections
Note 2
See Recommended Tightening
Torques in Table 4-1.
M
M
Notes: 1. Metal conduit should be used. Connect conduits
so the use of Load Reactor or RC Device does not
interrupt EMI/RFI shielding.
2. See Line/Load Reactors described previously in
this section.
3. Use same gauge wire for ground as for U, V and W.
4.5 Motor Over-Temperature Sensing
The Baldor VS1MX drive provides motor overload protection in accordance with the National Electrical Code (US).
• Where a Motor Over-Temperature Sensing device is not connected or not utilized, Thermal Overload Memory Retention
must be enabled by setting P-46 = 1.
• Where a Motor Over-Temperature Sensing device is utilized and connected to the drive, the connection must be carried
out according to the information shown in Figure 8-2.
