14
3 Operation
3.1
Starting the A75D(E)
All equipment is shipped from the factory fully checked and adjusted based on the customer order. Do not
make any adjustments unless the equipment has been powered-up and the settings have been determined to
be incorrect.
Factory Settings
The factory settings of the A75D(E) are based on the customer order, unless otherwise specified all units are set
at the factory with the following settings.
Float Voltage:
2.17 Volts/Cell (V/C) for Lead Acid (LA)
2.25
V/C
for
Valve
Regulated
Lead
Acid
(VRLA)
1.40
V/C
for
Nickel
Cadmium
(NC)
Equalize Voltage:
2.33
V/C
for
LA
2.27 V/C for VRLA
1.55 V/C for NC
Low DC Voltage:
1.98 V/C for LA
Low DC Current:
0.5 Amps
Current
Limit:
105% or nominal output current
High DC Voltage:
2.45 V/C for LA
High Voltage Shutdown:
2.50 V/C for LA
Battery End of Discharge:
1.75 V/C for LA
Equalize Timer Mode:
Mode 0
Equalize Time:
Eight Hours
3.1.1 Checking the Installation
Before attempting to start up the A75D(E) check and verify that all connections are correct. Check that all
terminations and contacts are tightened securely. Check that the transformer is set for the correct voltage and
that the input frequency matches the nameplate or the charger. Check that the battery/load voltage matches
the DC output voltage on the nameplate of the charger.
3.1.2 Starting/Stopping the A75D(E)
Once proper connections are established energize the power supply by turning on the unit’s AC breaker (the DC
breaker should be off). This will charge the capacitors inside the unit and eliminate heavy arcing when the
batteries are connected. After about 30 seconds, turn on the DC breaker. When shutting down the A75D(E)
switch off the DC breaker first and then switch off the AC breaker.
3.1.3 Start-Up
Sequence
Upon powering up the A75D(E) a test sequence is activated. This test flashes all of the units LEDs and
activates all alarms. The LCD will display the model and software number.
