Resetting The Monitor; Buffered Transducer Output; Initiating A Monitor Self Test - GE Bently Nevada 1900/27 Operation And Maintenance Manual

1900/27 Vibration Monitor Operation and Maintenance Manual

3.5 Resetting the Monitor

Use reset to unlatch a latched relay or to stop a flashing LED. You can reset the
monitor by pushing the Reset switch on the front panel or by pressing a remote
reset button that is connected to the remote reset terminals.
Remote reset can be accomplished by wiring a normally opened, momentarily
closed switch or button to the remote reset terminals. The remote reset contact
can be 33 m (1000 ft) from the monitor. The remote reset feature of the 1900/27
lets you reset the monitor without opening the enclosure containing the monitor.

3.6 Buffered Transducer Output

Use the buffered transducer output to obtain the raw integrated transducer
signal. The sensitivity of the buffered transducer zero to peak output is 500
mV/mm/s (19.7 mV/in/s).
The buffered transducer output coaxial connector is located on the front panel of
the monitor. Use this connector to attach diagnostic equipment such as an
oscilloscope or a recorder to the buffered velocity signal.

3.7 Initiating a Monitor Self Test

Self test is initiated by moving switch 6 of the 6-position Configuration switch to
the on position. Once the self test begins, move the switch back to the off
position. Self test lasts approximately 30 seconds.
When self test begins all the LEDs and numerical segments of the LCD turn on to
visually verify that they operate properly. During self test the relays stay in the
state they were in at the start of self test. During self test the power supplies are
checked, the signal path is verified, and the alarm detection circuitry is tested.
If any part of self test fails, an error code is displayed on the LCD. Error code E1
corresponds to a power supply circuit failure. Error code E2 is a signal path or
alarm detection circuit failure. Error code E3 occurs when the monitor is NOT OK.
The monitor checks errors E1 and E3 continuously, not just during self test. Error
E2, a signal path failure, can only be checked during self test, and will remain on
until the monitor is reset even if the failure no longer exists.
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