Bently Nevada 3300/50, Руководство по эксплуатации, Страница: 87 / 122

Tachometer Maintenance
124 I Test Alerts (Zero Speed Tach.)
M O M
PROX I M I TOR A
j g = 1 -
a
PROX I M I TOR 8
KEYPHASOR O R G E A R
1. Disconnect the COM and IN wiring from the Transducer
A and B terminals on the Signal Input Module.
2. Connect a function generator output to an oscilloscope
input. Adjust the function generator output until a sine or
square wave having sufficient amplitude t o trigger the
tachometer is displayed.
a Disconnect the function generator from the oscilloscope
input and connect it to the XDCR A and B terminals on the
Signal Input Module.
4. Adjust t h e function generator frequency until t h e
Tachometer displays an RPM reading below the over speed
setpoint or above the under speed setpoint and over the
Zero Speed setpoint.
5. Press the RESET switch and verify that the TRIGGER OK
LEDs are on, and the RPM Alert and Zero Speed Alert
LEDs are off.
83871.01 •
CAUTION
Tests will exceed Alert set
point levels causing Alerts
to activate. This could result
in r e l a y contact s t a t e
change. S e e B y p a s s
Section 18.
A\WARNING
High Voltage present
could c a u s e s h o c k ,
bums or death.
Do Not touch exposed
wires or terminals.
e
T A CHOL1ET ER
M I U M M M M I M I
3600
PFM
ZERO SPEED
ENABLED
WA R N I N G
• • 1 0 . 0
V I N M M I ' M a w s
fle NMI g a • • • •
P O W =
SEE mANUAL
• 0%6
0 . . i > 1 6 • 0
0 0 B . 0 m
E I N . E r i T E : ]
A
I M P T I M M T e t A M O R M M
42
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