User's Manual

044-05156 Rev C 38
Charger Capacity
Time
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Battery Voltage
Constant Current
Stage
Absorpation Mode Float Mode
Battery Recharge Cycle from Full Discharge
(1.75 V/Cell) to 100% Charge
Recharge Time 4 x 4KW Modules
G3S-1900-125 MCPA Load Time to 80% Recharge (Hours)
1 MCPA 52.8 0.38
2 MCPA 105.6 0.36
3 MCPA 158.4 0.35
4 MCPA 211.2 0.38
5 MCPA 264 0.38
6 MCPA 316.8 0.42
The batteries meet: UL, NEBS, and EUROBAT requirements and have a 10 year plus classification compliance.
They have also been tested in accordance with BS6290 Part 4. Two 600A fuses (Bussmann PN: TPL-CZ), located
in the LVD, protect the batteries.
4.8.2.1 Battery Heater
The battery heater is a thin, sheet-like element located between metal panels directly beneath the batteries. The
battery heater receives 240 volts AC (400 W) directly from the AC panel circuit breaker through a temperature
sensitive relay. The AC contacts of the relay close when the ambient temperature in the battery compartment drops
below 0 °C (32 °F) allowing the heater to warm the compartment. The heating pad is turned off when the thermostat
reaches 10 °C (50 °F). A separate temperature probe is placed in the battery compartment that is used by the LVD
to adjust the charge voltage, and is independent of the battery heater.
The battery heater generates 400 watts (1367 BTUs) of heat and has a maximum surface temperature of 200 ºC or
392 ºF.
4.8.3 Power Plant Monitoring
A controller card in the LVD monitors the performance of the rectifiers. When each rectifier’s sense line is
connected to the LVD, the rectifier is slaved to the control card for the final output voltage. Therefore, both the
sense line and +27 Vdc bus between the LVD and the rectifier must be connected for the rectifier to supply the
correct voltage to the system. The LVD control module may control up to 6 rectifier modules and adjusts rectifier
output to the recommended battery float voltage for a given temperature.
The LVD controller ensures that the rectifier outputs are balanced and monitors the rectifiers for failures. A
potentiometer located on the front plate of the controller sets the float voltage at 25°C (77°F). The factory preset is
27.6 Vdc. Failures are reported to the SIM.