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System Service
B-45.
BATrERY TEST. The battery test certifies that the backup capability of the power supply
is functioning normally. The system must be halted before performing this test. Proceed as follows:
a. On the rear panel of the power supply, momentarily press the BATTERY TEST toggle switch.
b. The CROWBAR/BATT TEST indicator should light and the BATTERY STATUS indicator
should flash at a 2-Hertz rate. Allow the battery to discharge for 3 to 5 minutes.
c.
Return the power supply to normal operation by pressing the RESET pushbutton on the power
supply front panel.
d. The BATTERY STATUS indicator flashes at a O.5-Hertz rate until the battery is fully charged.
Then the indicator remains continually lit.
B-46.
HP 30311A ADJUSTMENTS
The following adjustments should be performed after replacing a power supply or after replacing a
circuit board or battery pack within the power supply.
B-47.
BATrERY (FLOAT) VOLTAGE ADJUSTMENT. Float voltage must be adjusted whenever
a battery pack is replaced.
CAUTION
The replacement battery pack must be at a stable known ambient
temperature before the adjustment is performed. For a change in
ambient temperature, the settling time for the pack is 4 to 6
hours. Failure to observe this precaution may considerably
degrade the backup time and/or shorten the life of the battery
pack.
Adjust the float voltage
as
follows:
a. Power down the system by placing the corresponding UPPER or LOWER 128K MEMORY DC
POWER switch on the System DC Control Panel to STANDBY and place the corresponding HP
30311A Power Supply power switch off (down).
b. Remove the power supply from the cabinet and place on a suitable support.
c.
Remove the top cover from the power supply.
d. Connect the digital voltmeter between the +16.45V test point on the control board (figure B-7)
and a common ground point on the edge of the control board.
NOTE
Allow the digital voltmeter to warm-up before taking any
measurements.
B-32
JAN 1977
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