Thermo Scientific 60-12 Operating And Service Manual page 30

4.3.3 60-12 ENC
1. Place a DC voltmeter across field terminals 17 (+) and 16 (-) of 60-12 ENC speed
sensor.
2. Depending on Model of scale integrator, reading should be 20, 24 or 30 VDC.
3. If no voltage present, check at integrator terminals (see scale integrator manual).
4. If voltage is present, check field wiring. If no voltage present, repair or replace
integrator.
5. Check output of speed sensor using an oscilloscope or frequency meter. Place meter
across terminals 15 (+) and 16 (-) of speed sensor (channel "A") or terminal 18 (+) and
16 (-) of speed sensor (channel "B").
6. With conveyor stopped, there should be no pulse output.
7. With conveyor running, output frequency should increase with an increase of belt speed.
Amplitude of pulse should be equal to voltage input (see step 2).
8. If no output, repair or replace speed sensor.
18 REC 3016 Rev M