| Speed Adjustment | This is a 0 to 5 K ohm, 10 turn potentiometer. With |
| Potentiometer | power off, remove the red, black and white pot |
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| leads from the motor control board at terminals |
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| P1,P2, and P3. With a digital multimeter, check the |
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| ohm reading across the red lead (P3) to the black |
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| lead (P1). This reading should be 5 K ohms ± 5% |
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| as the pot is rotated from low to high. Place the |
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| meter leads on the red lead (P3) and on the white |
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| lead (P2). Rotating the pot. slowly, from low to high, |
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| the meter reading should show an even transition |
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| from 0 to 5 K ohms ± 5%. There should be no dead |
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| or open spots through out the 10 turns of the pot. |
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| Check all three leads to ground. There should be |
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| no continuity to ground. If any of the above checks |
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| fail, replace the pot. |
| DC Motor Control Board | Check for 120 VAC input to the control board at |
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| terminals L1 and L2. If not present, check the |
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| conveyor switch and wiring back to 3 amp fuse and |
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| then back to power source if necessary. If 120 VAC |
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| is present at L1 and L2, check the VDC output at |
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| terminals A+ and |
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| check the 4 amp and the 1 amp fuses on the |
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| control board. If 120 VAC is present at terminals L1 |
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| and L2, but DC voltage is not present at A+ and |
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| providing the 1 amp and 4 amp fuses are good, |
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| replace the board. If DC voltage is present at A+ |
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| and |
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| as follows. |
| Conveyor Gear Motor | If DC voltage is present at A+ and A- and the motor |
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| does not run, first check the mini breaker and then |
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| the conveyor. Refer to the next possible cause. |
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| Check the leads to the motor for evidence of any |
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| shorts or opens, and each lead to ground. If the |
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| motor fails the above tests, replace motor. Remove |
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| dust cover from the top of the motor and rotate |
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| motor shaft to determine if there is a locked rotor or |
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| a locked gear box (use care so encoder disc is not |
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| damaged). |
| Conveyor | Check for any mechanical |
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| improper adjustment. Also check for worn bearings. |
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| The Installation and Operations Manual shows |
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| proper conveyor belt adjustment. A conveyor belt |
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| that is over tightened will cause excessive bearing |
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| wear and sometimes, irregular speed. |
Conveyor speed | Power Supply | Check power supply at the DC control board for the |
varying or intermittent |
| 120 VAC at board terminals L1 and L2. If voltage is |
|
| not present, check main circuit breakers. |
34 | Impinger I |
