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BP1620, BP1628 & BP1640 Granulators Page 23 BP1600
• For granulators equipped with conveyors, fans, etc., test
their operation also by pressing the appropriate
pushbutton. Check fan outlets for proper airflow.
• For granulators with emergency stop pushbuttons, test
the buttons to insure all motion stops.
• With the granulator running, loosen the handknob on the
front access doors and screen chamber to verify the
safety interlock switch shuts the machine off. If the hand
knob is completely loose and the power does not
disconnect, the interlock switch is not working and the
cause of the malfunction must be determined.
Alternate Procedure for testing interlock switch operation
1. Depress the stop/start push button to shut down the granulator
2. Disconnect and lockout the main power supply to the granulator as required by
OSHA’s Lockout/Tag out requirements.
3. Using the wiring diagram supplied with your granulator or by tracing the wires
from the interlock switches, locate the interlock switch wire numbers on the
terminal strip in the control panel. They will usually be marked #1 & #3, #3 & #4
and #4 & #5 etc. depending on how many switches are used on your machine.
4. Connect the leads of and ohm meter across each interlock switch or across all
interlock switches (wires #1 and #5). Set the ohm meter on the lowest resistance
scale. When the interlock actuator bolts are in place and properly activating the
switch, the ohm meter will read zero resistance.
5. Loosen the actuator bolt of each interlock switch (usually about 3 or 4 turns) one
at a time, until the ohm meter reads infinite resistance. If the meter reads infinity
before the bolt can be completely removed, the interlock is working. If the
actuator bolt can be completely removed and the resistance DOES NOT read
infinity, the interlock is not working and the complete mechanism including the
switch must be removed and disassembled to determine the cause of the
malfunction.
If testing determines that an interlock is not working, BE SURE TO SHUT
DOWN THE GRANULATOR, PULL IT OUT OF SERVICE AND LOCKOUT
THE MAIN POWER before removing the front cover, opening the hopper or
attempting to gain access to the interlock switches. The interlock switches and
mechanisms can be accessed by removing the belt guard on the right side of the
granulator. In some cases, it may be necessary to remove or slide back the
flywheel to completely remove the interlock switch assembly.