Bently Nevada 3300/50, Operation Manual

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Tachometer Maintenance
1 2 4 1 Test Alerts (Zero Speed Tach.) (Cont.)
6. Adjust t h e function generator frequency until t h e
Tachometer displays an RPM reading above the RPM Alert
over speed setpoint or below the RPM Alert under speed set
point.
7. Verify that the RPM Alert LED turns on (Flashing if the first
out option is selected), and that the RPM Alert relay has
changed state. (The Relay will not change state if the Alert 1
Relay has been Bypassed. See section 18.)
8. Press the RESET switch on the System Monitor and verify
that the RPM Alert LED remains on steady.
9. Short the Zero Speed Enable contacts on the Signal Input
Module.
10. Slowly adjust the function generator frequency until the
Tachometer displays an RPM reading below the Zero Speed
Alert setpoint. (The Zero Speed Alert provides protection
against rapid ramp-down. A Zero Speed Alert will not occur
if the RPM value is bought down too fast. If this occurs, the
TRIGGER OK LED(s) will go out to indicate this condition.)
11. Verify that the Zero Speed Alert LED turns on (Flashing
if the first out option is selected).
12. Verify that the Zero Speed Alert relay has changed state.
(The Relay will not change state if the Alert 2 Relay has been
Bypassed. See section 18.)
13. Press the RESET switch on the System Monitor and verify
that the Zero Speed Alert LED remains on steady.
14. Adjust t h e function generator frequency until t h e
Tachometer displays an RPM reading below the RPM Alert
over speed setpoint or above the RPM Alert under speed
setpoint and above the Zero Speed Alert setpoint.
15. Press the Reset switch on the System Monitor and verify
that the RPM and Zero Speed Alert LEDs go off.
16. Connect all field wiring.
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