Bently Nevada 3300/46, Operation Manual

Page: 5 / 86

Ramp Differential Expansion Monitor Maintenance
12 T e s t OK Limits Cont.
6. Verify that the OK relay changes state (de-
energized). Note : all other channels in the
rack must be OK or bypassed in order for the
relay to change state.
7. Decrease the power supply voltage (less
negative) to -9 Vdc and verify that the OK LED
comes back on and the OK relay energizes (if
the Non-latching Not OK jumper is installed).
Press the RESET switch on the System
Monitor to reset latching Not OKs.
8. Gradually decrease the power supply voltage
(less negative) until the OK LED goes off
(lower limit). Verify that the lower OK limit is
within the lower OK voltage range (reference
Table 8 ).
9. Verify that the OK relay deenergizes.
10. When finished, disconnect the power supply
and multimeter and reconnect COM and IN
wiring to the channel A terminals on the Signal
Input Relay Module. Verify that the OK LED
comes on and the OK relay energizes (if the
Non-latching Not OK jumper is installed).
Press the RESET switch on the System
Monitor to reset latching Not OKs.
11. Repeat steps 1 through 10 for channel B.
1.11.111\
TABLE 8. OK Voltage Limits
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1 1 • 1 1 : 1
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011-FE:ENT I At_
ExpANSIC'; MONITOR
Transducer Type L o w e r OK Voltage Limits
Upper OK Voltage Limits
11 m m
14 mm
25 35, d 50 mm
-3.25 Vdc to -3.35 Vdc
-1.65 Vdc to -1.75 Vdc
-1.30 Vdc to -1.40 Vdc
-19.68 Vdc to -19.88 Vdc
-18.20 Vdc to -18.40 Vdc
-12.40 Vdc to -12.60 Vdc
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