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INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07) — PAGE 57
Battery Charger Introduction
The following section will cover the optional battery chargers
offered for Industrial Generators with 12 or 24 Volt systems.
MQ Power battery chargers offer accurate, completely
automatic charging of lead-acid and nickel-cadmium
batteries. The battery charger's output voltage automatically
adjusts to changing input, load, battery and ambient
conditions. The result is fast battery charging without
overcharging and consequent loss of battery electrolyte.
Standard features include AC line compensation, precision
voltage regulation, current limiting, automatic dual-rate
charging, ammeter and temperature compensation.
Auto Boost Feature
After a battery has been discharged or when AC power is
restored following a power failure, the charger operates in
the high-rate constant current mode until the battery voltage
rises to the preset boost level. Once this boost level is
reached, the charger operates in constant voltage boost
mode until the battery's current acceptance falls to less than
70% of the charger's rated output. The charger then reverts
to the lower float voltage, where it operates until another
battery discharge or AC failure occurs.
Temperature Compensation
All batteries have a negative temperature coefficient. The
battery charger is equipped with temperature compensation
to assure correct charging in all conditions. Float voltage
increases slightly as ambient temperature decreases, and
decrease as ambient temperature increases.
Current Limiting & Overload Protection
The charger is electronically current limited. When the
charger is operating into a fully discharged battery, or is
otherwise overloaded, charging voltage reduces so that the
charger's rated output power in watts is not exceeded. The
charger will operate satisfactorily into a short circuit
indefinitely. In addition, AC and DC fuses are used for
overload protection.
Indicators and Adjustments
The battery charger has a 2.5" scale DC ammeter located
on the outside of the battery charger aluminum enclosure.
There is also an internal adjustment for float voltage. This
also adjusts the boost voltage which is set at 5% higher
than the float voltage.
Figure 19. LC Battery Charger
Operation
Apply AC power to the charger (Figure 19). The charger
should start immediately. The charger will automatically
recharge and maintain the battery with no further attention
from the user.
BATTERY SYSTEM — BATTERY CHARGER
Table 23. Standard Factory Setting
Float (12V — 24V) 13.3 — 26.6
Boost (12V — 24V) 14.0 — 28.0
Table 22. LC Battery Charger Specifications
Input Voltage 115VAC ±10%
Input Frequency 57-63Hz
Output Voltage 12 or 24VDC (nominal)
Float Voltage Adjustable
Boost Voltage 5% Above Float Voltage
Maximum Output Current 3.0 Amps
Output Voltage Regulation ±1%
Operating Temperature Range -10°C to 50°C
Humidity Range 5% to 95% Non-condensing
Housing Clear Anodized Aluminum