Baldor MicroFlex, Installation Manual

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3-18 Basic Installation MN1919
3.5.1 Motor circuit contactors
If required by local codes or for safety reasons, an M-Contactor (motor circuit contactor) may
be installed to provide a physical disconnection of the motor windings from the MicroFlex (see
section 3.5). Opening the M-Contactor ensures that the MicroFlex cannot drive the motor,
which may be necessary during equipment maintenance or similar operations. Under certain
circumstances, it may also be necessary to fit a brake to a rotary motor. This is important with
hanging loads where disconnecting the motor windings could result in the load falling. Contact
your local supplier for details of appropriate brakes.
CAUTION : If an M-Contactor is installed, the MicroFlex must be disabled at least
20ms before the M-Contactor is opened. If the M-Contactor is opened
while the MicroFlex is supplying voltage and current to the motor, the
MicroFlex may be damaged. Incorrect installation or failure of the
M-Contactor or its wiring may result in damage to the MicroFlex.
Ensure that shielding of the motor cable is continued on both sides of the contactor.
3.5.2 Motor power cable pin configuration - Baldor BSM rotary motors
Figure 8 shows the pin configuration for a typical Baldor motor cable, part number
CBL025SP-12:
Signal name Motor / cable pin Motor cable wire color
Motor U 1 Black, labeled ‘1’
Motor V 4 Black, labeled ‘2’
Motor W 3 Black, labeled ‘3’
Earth/ground 2 Green/Yellow
Thermal switch A Green
Thermal switch B White
Brake C Blue
Brake D Red
Cable connector end view
(female)
1
B
A
3
2
4
Motor power connector
(male)
1
B
A
3
2
4
C
D
C
D
Note:
Not all motors
are fitted with
a brake so
pins C and D
might not be
connected.
Figure 8 - Baldor motor power cable pin configuration