Section 4 - Field Testing and Troubleshooting
Interconnect Cable is Damaged: Shorted
Visually inspect the interconnect cable for apparent damage. Disconnect the
interconnect cable at both ends and measure the resistance among the three
conductors of the interconnect cable. If intermittent or shorted, replace the cable.
Interconnect Cable is Damaged: Open
Disconnect the interconnect cable at both ends. Short two conductors together
at one end at a time and measure the resistance of the cable at the other end. If
open circuited, replace the cable.
Cable conductors are switched
With the accelerometer and the interconnect cable connected to the monitor
measure the DC voltage across terminals "IN" and "COM" for the 3300 Monitoring
System and "SIG/A" and "COM" for the 2201 and 3500 Monitoring Systems. The
voltage should be between -8.0 and -9.0 Vdc. If it is not, check for proper
connections.
4.2 Fault Indication #2 Cause/Solution
4.2.1.1 M o n i t o r showing vibration on the front panel when the machine is off line.
Noise is coupled to the Accelerometer signal.
Check that the shield wire is connected to earth or chassis ground.
Check that the accelerometer and the machine case are properly grounded.
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Summary of Contents for Bently Nevada 330400
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