3200 Series Granulators 63”and 84”
357563
•
08/22/2019
27
Using and Ohmmeter to Test the Interlock Switches
Use the following procedure to test the interlock switches using an ohmmeter:
1.
Turn the main power off, remove the line fuses, and tag the machine as out of service.
2.
Using the wiring diagram in Section 7-7, locate the interlock switch terminal strip in the
open/close control panel. The wires for the upper chamber interlock switch are
numbers 3 and 5. The wires for the screen cradle interlock switch are numbers 1 and 3.
3.
Connect an ohmmeter across each interlock switch terminal or across all interlock
switch terminals (wire numbers 1 and 5).
4.
Switch the ohmmeter resistance to the lowest scale. When the interlock actuator
bolts are in place and properly activating their switches, the ohmmeter should read
zero resistance. When either or both actuator bolts are withdrawn, the ohmmeter
should read infinite resistance.
5.
Loosen one actuator bolt 3 to 4 turns. If the meter reads infinity before the bolt can
be completely removed, the interlock is working. If the meter reads zero resistance
when the actuator bolt is completely removed, the interlock is not working.
6.
Replace the first actuator bolt tested before testing the next one.
Manually Testing the Interlock Switches
With the cutting chamber and screen cradle closed and the power on, use the following
procedure to manually test the interlock switches:
1.
Push the start button to start the granulator
2.
Retract the screen cradle interlock actuator screw by turning it counterclockwise.
Make sure that the end of the actuator screw is visible and clear of any contact. The
granulator should stop. If the granulator does not stop, the interlock is not working.
3.
Engage the screen cradle interlock actuator screw by turning it clockwise, and
restart the granulator.
4.
Retract the cutting chamber interlock actuator screw by turning it counterclockwise.
Make sure that the end of the actuator screw is visible and clear of any contact. The
granulator should stop. If the granulator does not stop, the interlock is not working.
5.
Engage the cutting chamber interlock actuator screw by turning it clockwise.
