INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –
THREE PHASE
Page 14 of 20
ALARM CONNECTIONS
Form “C” contacts are provided which indicate an AC power failure and Summary Alarm. The AC failure
contacts energize on alarm, the summary contacts de-energize on alarm. There is a 5 second delay on
alarm. The contacts are rated at 60Va at 125 Vdc or AC. All relay contacts are shown in the de-energized
state on schematics. The AC failure alarm is shown in non-alarm state on the schematic. The Summary
alarm is shown in alarm state on the schematic. Customer alarm connections should be made
accordingly.
OPERATION
START UP
When all connections have been made, verify that they are correct!
Apply the correct AC voltage to the input terminals.
Verify the output voltage, output current, and the alarm and status lights to be sure the unit is operating
properly.
If the unit is not operating correctly check the connections again and read “TROUBLE SHOOTING”.
ADJUSTMENTS
CURRENT LIMIT ADJUSTMENT
The current limit adjustment is factory set at approximately 105% of rated DC output current. The
adjustment provides a means of changing the rectifier current limit between 50-110% of rated output.
Turning the adjustment, which is located on the unit front panel, clockwise lowers the current limit;
turning counterclockwise raises the current limit.
CAUTION: CURRENT LIMIT MUST NOT EXCEED 110%. OF RATED OUTPUT CURRENT.
FLOAT ADJUSTMENT
The float adjustment is factory set at 2.17 volts/cell (Lead), 2.25volts/cell (VRLA) or 1.4 volts/cell (N.C.).
Turning the adjustment, which is located on the front door of the unit, clockwise raises the float voltage
(the F/E switch must be in the float position).
The adjustable range is as follows:
2.12-2.3 volts/cell +/- .1 Volts (Lead) (VRLA)
1.39-1.45 volts/cell +/- .1 Volts (N.C.)
EQUALIZE/SELECT SWITCH:
This switch is located on the unit front panel.
EQUALIZE ADJUSTMENT
The equalize adjustment is factory set at 2.33 volts/cell (Lead), 2.27 volts/cell (VRLA) or 1.55 volts/cell
(N.C.). Turning the adjustment, which is located on the front panel of the unit, clockwise raises the
equalize voltage (the F/E switch must be in the equalize position).
The adjustable range is as follows:
2.25-2.4 volts/cell +/- .1 Volts (Lead) (VRLA)
1.5 - 1.6 volts/cell +/- .1 Volts (N.C.)
In the equalize position, the rectifier will maintain the battery at the voltage level preset by the “Equalize”
potentiometer adjustment and at the same time maintain the load up to the rectifier’s rated output.
