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Procedure 9-4 (continued)
Adjusting the LVD unit
Step
13
14
15
16
17
Set the LVDR threshold to –50.5 V dc
18
19
Return the BIP shelf to normal operation
20
21
22
23
24
25
AccessNode Modular Business Package VTBM Ring User Guide P0904244 Issue 1.0
Action
Slowly turn the LVD ADJ potentiometer clockwise until the LVD ALM LED
illuminates. Then go to step 17.
If the LVD ALM LED illuminates before reaching −42.5 ± 0.2 V dc, continue to
turn the TEST ADJ potentiometer counterclockwise until the voltage reading
reaches –42.5 V dc.
Slowly turn the LVD ADJ potentiometer counterclockwise until the LVD ALM
LED extinguishes.
Slowly turn the LVD ADJ potentiometer clockwise until the LVD ALM LED
illuminates.
Slowly turn the TEST ADJ potentiometer clockwise until the LV ALM LED
extinguishes.
CAUTION
Risk of service outage
If you switch the BYPASS/NORMAL switch back to
NORMAL position before the LVD and LVR potentiometer
adjustments are fully verified, you may cause a loss of
power to the load.
Continue to adjust the TEST ADJ potentiometer clockwise and monitor the
digital multimeter and the LVD ALM LED until the LVD ALM LED extinguishes
or –50.5 V dc is reached.
If the LVD ALM LED
does not extinguish before reaching –50.5 V dc
extinguishes before reaching –50.5 V dc
Slowly turn the low-voltage reconnect (LVR) potentiometer counterclockwise
or clockwise until the LVD ALM LED extinguishes.
Set the LVD BYP/NORMAL switch to the NORMAL position.
Ensure that all circuit breakers on the BIP are in the OFF position.
Ensure that all circuit breakers on all the rectifiers are in the ON position.
Turn the circuit breakers on the dc distribution unit to the ON position.
Verify that the system float voltages are set to the battery manufacturer's
requirement.
Note: Johnson control battery float voltage is –54.5 ± 0.1 V dc.
Go to Procedure 9-5, "Adjusting the load sharing."
—end—
Replacing the low-voltage disconnect unit 9-15
Then go to
step 19
step 20
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