2.Auxiliary Contact Block Description
The auxiliary contact block is mounted on the side of the overload. Its' function is to sense an overload trip, thereby triggering a safety fault which will disable the drying cycle. A motor fault message will appear on the display of the Telemecanique XBT unit.
a. Auxiliary Contact Block Replacement
1)Discontinue electrical service to the dryer.
2)Remove the thermal magnetic starter (TMS) from the din rail by pulling the tab on the bottom of the contact block and lift upward.
3)Remove the two (2) wires going to the auxiliary contact block and label for correct reinstallation.
4)There are two (2) types of auxiliary contact blocks...one style has a screw and the other style has a clip. In both styles, disassembly and assembly is recommended with the thermal magnetic starter (TMS) in the "STOP" position.
a)To remove the style that has the screw from the TMS, simply remove the screw.
b)To remove the style that has the clip, simply push the clip and twist the auxiliary contact block to remove.
5)To install new auxiliary contact block, reverse Step # 4 thru Step #2.
6)Reestablish electrical service to the dryer.
3.Varistor (MOV [Metal Oxide Varistor]) Description
The varistor (MOV) is used to suppress any inductive electrical spikes produced by the energizing and coil voltage.
a) Varistor (MOV [Metal Oxide Varistor]) Replacement
1)Discontinue electrical service to the dryer.
2)Loosen the screws marked A1 and A2 on the contactor.
3)Verify that no additional wires were inadvertently removed.
4)Reverse above procedure to install new varistor.
43
