3200 Series Granulators 63”and 84”
357563
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08/22/2019
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5-7 Testing and Adjusting Zero Speed Sensor
The zero speed sensor detects the motion of the rotor assembly The sensor is interlocked to
the control circuits of the hydraulic cylinders. If the rotor is turning, then the hydraulic
cylinders should not operate. If the hydraulic cylinders are able to operate before the rotor
has come to a complete stop, the zero speed sensor is not working.
The sensor has a green light, which is lit to indicate that the power to the sensor is on. There
is a red light on the sensor amplifier located in the control console. When the rotor is in
motion, the red light is lit. If the rotor is stopped, the red light is not lit.
Testing the Zero Speed Sensor
Use the following procedure to test the zero speed sensor:
1.
Press the Start button to start the granulator.
2.
When the machine reaches full speed, press the Stop button to stop the granulator.
3.
Open the cutting chamber as directed in Section 3-4.
4.
Re-start the granulator.
5.
When the machine reaches full speed, press the Stop button to stop the granulator.
6.
Open the screen cradle as directed in Section 5-5.
The hydraulic cylinders should NOT operate until the rotor has come to a complete stop. If
the system operates before the rotor stops, release the button on the selector switch and
return the switch to its Off position. Turn off and lock out the power and have a mechanic
and electrician adjust the sensor position.
Adjusting the Sensor Position
If the rotor is in motion and the red light is off, check the sensor position. If the green light is
off at all times, or if adjusting the sensor does not correct the sensor operation, then check
the control circuit logic between the open/close control panel, the safety switches, the zero
speed amplifier, and the zero speed sensor. Refer to the wiring diagram in Section 7-7.
Use the following procedure to adjust the zero speed sensor position:
1.
Disconnect and remove the sensor wire from the control console.
2.
Remove the sensor from the drive guard. Measure from the outside surface of the
zero speed sensor mounting plate to the flywheel. Deduct 1/8” from the
measurement. Using this dimension, measure from the end of the sensor and set
the locknut at this point.
3.
Thread the sensor into the hole and lock it in position. Turn the rotor assembly
slowly by hand to be sure that there is no interference between the sensor and the
rotating members. Complete the wiring between the sensor and the control
console.