Relay Mode Switch; Setpoint Adjustment - GE Bently Nevada 1900/27 Operation And Maintenance Manual

1900/27 Vibration Monitor Operation and Maintenance Manual

3.3 Relay Mode Switch

The Relay Mode switch lets you inhibit relays by placing the monitor in bypass.
The Relay Mode switch has two positions, Normal and Bypass. Table 3.3
describes the behavior of the Relay Mode switch.

3.4 Setpoint Adjustment

Adjust the Alert and Danger setpoints by using the adjustment screws recessed
in the front panel of the monitor. The adjustment range for the Alert and Danger
setpoints is 2.54 to 50.8 mm/s (0.1 to 1.9 in/s). Use the LCD display to view the
setpoint value while adjusting it.
Place the monitor in bypass while adjusting the setpoint so the relays will not
activate accidentally. With the monitor placed in bypass, the Alert or Danger LED
will come on when the corresponding setpoint is adjusted below the vibration
level. If the monitor is taken out of bypass with one or both of these LEDs on, the
corresponding relays will activate as soon as the monitor is taken out of bypass.
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Table 3.3: Relay Mode Switch
SWITCH SETTING EFFECT ON RELAYS
Relays react to an alarm
condition
Relays do not react to an alarm
condition and the Bypass LED
comes on. Alert and Danger
LEDs continue to track alarm
conditions in a nonlatching
manner. If relays are activated
before the switch is set, they will