•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.
BP1620, BP1628 & BP1640 Granulators | Page 23 BP1600 |
