Carrier 69UG15 manual Battery Charger, Operating Controls and Instruments, Introduction

The rotor is, in effect, the secondary of a rotating current transformer induction frequency converter. The exciter rotor output voltage is applied to the generator field windings by a three--phase, full wave rotating silicon rectifier unit. The response time of the excitation system is very fast as the exciter stator carries an alternating current corresponding to the load current that appears immediately on the exciter primary. An increase in load current will cause an immediate increase in the exciter secondary output voltage, which is rectified and applied to the generator field windings. The inherent compounding characteristics of the excitation system provide excellent voltage regulation even under heavy overload conditions.

FIELD
	SHUNT
	SERIES
STATOR
GENERATOR	STATOR
	L
	O
	A
	D
	ROTOR
RECTIFIER	EXCITER
ASSEMBLY
Figure 1-5 A--C Generator Circuit Diagram

CAUTION

Observe proper polarity when installing the battery or connecting a battery charger. The negative battery terminal must be grounded. Reverse polarity may damage the charging system. When charging the battery in unit, isolate the battery by disconnecting the negative battery terminal first, then the positive. Once the battery has been charged, connect the positive battery terminal first, then the negative.

1.6 BATTERY CHARGER

The solid state battery charger (see Figure 1-2) is located to the left of the radiator. The charger is powered by the generator, and this input is protected by a circuit breaker located on the control panel. The battery charger produces a tapered charge (25 amps maximum) and is designed not to overcharge the battery.

1.7OPERATING CONTROLS AND INSTRUMENTS

1.7.1 Introduction

Components required for monitoring and controlling the unit are located in the control box, on the control panel (see Figure 1-6) and on the receptacle box (see Figure 1-1).

1.7.2Control Panel and Related Components a. Gauges and Senders

1.Oil Pressure Gauge (see Figure 1-6, Figure 1-7, Figure 1-8)

The purpose of this gauge is to observe normal operating engine oil pressure. Normal oil pressure is 35 to 60 psig (3.3 to 5.2 kg/cm2).

2. Oil Pressure Sender (see Figure 1-4)

This device senses engine lube oil pressure and transmits a signal to the oil pressure gauge. The oil pressure sender is located on the oil filter housing.

3.Water Temperature Gauge (see Figure 1-6, Figure 1-7, Figure 1-8)

The function of this gauge is to observe water operating temperature. The gauge is connected to the water temperature sender.

4. Water Temperature Sender (see Figure 1-2)

This device senses engine water temperature and transmits a signal to the water temperature gauge.

5. Low Coolant Sensor (see Figure 1-2)

This device senses the coolant level inside the radiator and will complete a conductive circuit as long as the probes remain immersed in coolant. When the coolant level falls below the probes, a signal will be sent to the auto restart module, shutting down the engine and all 12--volt circuitry.

6. Auto Restart Module

Auto start/restart is provided to simplify the start--up process and provide an automatic restart feature that will automatically attempt to restart the unit in the event of shutdown. Four LEDs are used to indicate shutdown from overcrank, overspeed, low oil pressure, and high water temperature. A fifth LED is used to indicate the unit is running. Refer to Table 1-2 for system preset values.

The auto restart function will perform a series of six attempts to restart the unit and make three attempts within each series. Once the function has completed all 18 attempts, the unit will automatically lock out future crank attempts. Refer to Table 1-3 for detailed information on auto restart sequencing.

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