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Test Procedures
153
CHAPTER
9: TEST PROCEDURES
Test procedure for motor encoders
An encoder can be checked for proper operation by following these steps.
1.
Open the main electrical enclosure.
2.
Turn the disconnect switch on.
3.
Push the “ON” button located on the door to engage power.
4.
While turning the shaft of the motor very
slowly, observe the LEDs (Light Emitting
Diodes) on the Amplifier Board. The 8 encoder
LEDs are labeled BELT Phase A, BELT Phase
B, H/S Phase A, H/S Phase B, NEEDLE Phase
A, NEEDLE Phase B, TWISTER Phase A, and
TWISTER Phase B. As you turn a motor, its
encoder LEDs should be turning “ON” and
“OFF”. Only one of the LED's should toggle at
any given time. However, the motor must be
turned very slowly in order to observe this
sequence because each LED turns “ON” and “OFF” 500 times per motor
revolution. Note: If an encoder lead is broken or disconnected that LED will be
“ON” all the time.
5.
If both encoder LED's are blinking as you rotate the motor and they do not always
blink at the same time, you can be well assured that the encoder is working
properly.
The following test procedures may require that tests are
made with the electrical enclosures open and power
turned “ON”. These tests should only be conducted by
authorized personnel who are aware of the electrical and
mechanical hazards present.
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