Baldor VS1MXS51, Installation & Operating Manual

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4-4 Power Wiring MN762S
4.4.6 Long Motor Leads
The wire leads that connect the motor to the control are critical in terms of sizing, shielding and the
cable characteristics. Short cable runs are usually trouble free but fault-monitoring circuitry can
produce numerous faults when long cables are used. Refer to Table 4-1 for maximum cable lengths.
Baldor recommends adding an optional load reactor to the output of the control. The load reactor and/
or common mode choke should be placed in close physical proximity to the control.
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.