Multiquip MQP40IZ Battery System — Battery Charger, Battery Charger Introduction, Operation

BATTERY SYSTEM — BATTERY CHARGER

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.

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.

Figure 19. LC Battery Charger

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

Table 23. Standard Factory Setting

Float (12V — 24V)	13.3 — 26.6
Boost (12V — 24V)	14.0 — 28.0

INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07) — PAGE 57