Section 4 - Field Testing and Troubleshooting
29
Interconnect Cable is Damaged: Open
Disconnect the interconnect cable at both ends. Then short the two conductors
together at one end and measure the resistance of the cable at the other end. If
the cable is open circuited, replace the cable.
4.2 Fault Indication #2
Cause/Solution
Unusually low vibration with non-machine related low level, broadband
noise.
Sensor signal is not isolated, is shorted to the case or has noise coupled to the
signal.
Use the following procedure:
Step 1: Measure the resistance between the “A” terminal pin and the sensor
case. Repeat the resistance measurement from the “B” terminal pin to the sensor
case. Resistance should be 1M
Ω
or greater.
Step 2: Inspect and/or clean sensor connector to remove foreign debris.
Step 3: Repeat resistance measurement of step 1. Replace sensor if resistance is
not 1M
Ω
or greater.
4.3 Fault Indication #3
Cause/Solution
Monitor is indicating transducer is OK (not-OK indicator is off), but there
is no vibration signal.
Sensor wiring is mis-wired or faulty Velomitor® Sensor.
Use the following procedure:
Step 1: Measure the bias voltage of the sensor at the monitor terminals.
Normally the voltage should be around 12 volts reference to the “B” terminal. If
the voltage is outside the specification limits (like 7 volts for the 330530) the
transducer wiring is most likely reversed.
Step 2: At the monitor input terminal reverse the wiring connection between “A”
terminal and “B” terminal.
Step 3: Retest the sensor as described in Step 1. If the voltage level is still outside
the specification limits then the Velomitor® Sensor is most likely at fault.
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