The CRM stands for Master Control Relay as it is a general E-stop by the look of it, the PACR appears to be part of a Proximity switch or a batch counter or a combination of both?
MOV is Metal Oxide Varistor, it will increasingly conduct as the voltage rises above the normal coil voltage, this has the effect of suppressing the back emf from the coil, the same way a diode works on DC coils.
Normally the E-stop circuit is trouble shot by reference your meter to neutral (#2) and work back along the E-stop string to find out where the 120v stops, this will detect open limit switches etc.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.