INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –
THREE PHASE
Page 6 of 20
GENERAL
The LaMarche models A75D and A75DE are SCR battery chargers. These models are designed with a
LCD Digital Display. The A75DE is designed as a battery eliminator and can be operated with or without
batteries connected.
The LaMarche model A75D/A75DE series battery charger is a solid state unit utilizing SCR technology. It
has +/- 0.5% regulation from no load to full load over the specified input voltage, frequency and ambient
temperature range.
The A75D/A75DE series is offered with DC output voltages of 24, 48 or 130VDC with output currents
from 25 to 500 Amps. These chargers may be powered with 208, 240, or 480VAC. The current limit is
factory set at 105% and is adjustable from 50 to 110%.
OUTPUT RATINGS
DC VOLTAGE
The A75D/A75DE series battery chargers provide separate voltage adjustments for floating or equalizing
lead or nickel cadmium cells. The float or equalize mode of operation is selected by pressing the equalize
button on the display which is located on the front of the battery charger.
The factory settings are as follows:
Float Voltage
Equalize Voltage
2.17 volts/cell (lead)
2.25 volts/cell (VRLA)
2.33 volts/cell (Lead)
2.27 volts/cell (VRLA)
1.40 volts/cell (NC)
1.55 volts/cell (NC)
VOLTAGE RANGE
Float
Equalize
Lead Acid
NiCad
24V
23 – 29.5
24 - 31
11 – 13L
17 – 20N
48V
46 - 57
48 - 61
22 – 26L
33 – 39N
130V
115 - 140
123 - 145
53 – 62L
83 – 93N
Note:
Typical cell ranges are based on the following:
Lead Acid 2.17 V/C Float, 2.33V/C Equalize
NiCad 1.44 V/C Float, 1.55V/C Equalize
OUTPUT CURRENT
See Input Current Chart
REGULATION
Steady State output voltage remains /- 0.5% of rated voltage for any load current from no load
to full load and for input voltages 10% / -12%.
FILTERING
A75D – NO FILTERING
A75DE - 100 mv RMS, with or without a battery connected
