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Procedure 10-1 (continued)
Checking and adjusting rectifier voltages
Step
Adjust the Equalize voltage
2
3
4
5
6
Adjust the float voltage to -54.5 ± 0.1 V dc
7
8
9
10
11
AccessNode Modular Business Package VTBM Ring User Guide P0904244 Issue 1.0
Action
Ensure that the ac and the dc circuit breakers on all rectifiers are in the OFF
position (see Figure 10-1).
Turn the rectifier 1 FLT potentiometer 2 turns counterclockwise.
Turn ON the dc then the ac circuit breakers on rectifier 1.
Hold the FLOAT/EQL momentary switch to EQL for local equalize and
measure the equalize voltage at the test points labeled V+ and V- on the
rectifier.
Adjust the EQL voltage by turning the EQL potentiometer clockwise to
increase the EQL voltage or counterclockwise to reduce the EQL voltage to
the recommended value (see Table 10-1).
Note: Johnson Control battery equalize voltage is -55.0 ± 0.1 V dc.
Change the EQL/FLT switch on rectifier 1 to the FLT position (see
Figure 10-1).
Note: The EQL/FLT switch on the rectifier must be in the FLT position when
adjusting the float voltage.
Slowly adjust the FLT potentiometer clockwise to raise the float voltage or
counterclockwise to lower the float voltage to the recommended value (see
Table 10-1).
Note: Johnson Control battery float value is -54.5 ± 0.1 V dc.
Turn OFF the ac then the dc circuit breakers on rectifier 1.
Repeat step 2 through step 9 for each rectifier installed.
Turn ON the ac then the dc circuit breakers on all rectifiers.
—continued—
MBP routine maintenance 10-3
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