M-Contactor
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.
Caution: If an M-Contactor is installed, the control must be disabled at least 20msec 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 me damaged.
A motor circuit contactor provides a positive disconnect of the motor windings from the control. Opening the M-Contactor ensures that the control cannot drive the motor. This may be required during certain manual operations with the load (like cleaning cutting knives etc.). Figure 2-3 shows how an M-Contactor is connected to the H series control.
Figure 2-3 Typical Connections for M-Contactor
Stop/E-Stop
See recommended tightening torques for terminal connectors.