330500 Velomitor Sensor, 330525 Velomitor XA Sensor, 330530 Radiation Resistant Velomitor Sensor Operation Manual
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4. Field Testing and Troubleshooting
Use the following procedure to test an installed Velomitor® Sensor and isolate a
suspected malfunction. The Velomitor® Sensor is a hermetically sealed unit with
no adjustments or field repairable components. If you determine that the
Velomitor® Sensor is not functioning properly, return it to a factory authorized
repair center for further evaluation and disposition.
When the Velomitor® Sensor is used with a Bently Nevada monitoring system,
the system indicates a sensor fault when the monitor's OK LED goes OFF. A fault
may be due to a sensor malfunction or a malfunction in the field wiring. Before
troubleshooting a suspected problem: first check to make sure that the sensor
has been correctly installed, all connections are secured and in the proper
locations. If the sensor is properly installed, use the following steps to help identify
the problem.
4.1 Fault Indication #1
Cause/Solution
Bently Nevada Monitor OK LED is off
Monitor Power is off.
Check that the monitor power supply is plugged in and power is on.
Interconnect cable is disconnected, connected loosely, or connected to the
wrong monitor.
Verify that the sensor is connected to the correct monitor and to the correct
monitor terminals. Check that the screws are tight.
Interconnect cable is not connected, connection is loose at the sensor, or
sensor is open/shorted.
Verify that the sensor is connected either visually or by measuring the DC bias
voltage between terminals “A” and “B” on the monitor (with the cable connected
to the sensor and monitor). The absolute value should be 12±3 Vdc. If the
measured DC bias voltage is not within the values indicated and the interconnect
cable has been verified not to be a problem (by using the next two steps), then the
sensor may be damaged.
Interconnect Cable is Damaged: Shorted
Visually inspect the interconnect cable for apparent damage. Disconnect the
interconnect cable at both ends and measure the resistance between the two
conductors, "A" to "B". If the measurement is intermittent or shorted, then replace
the cable.
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