Ce-niehoff-co C709/C725 Troubleshooting Guides Manual de usuario descargar pdf (Pagina 4)

Page 4

TG64B

Section C: Advanced Troubleshooting

A2-329 Regulator

DESCRIPTION AND OPERATION

A2-329 Regulator with OVCO is attached directly to the

outside of alternator. Regulator setpoint has flat temper-

ature compensation. Voltage setpoint is 28.0 ±1.0 V and

14.0 ±0.5.

OVCO (overvoltage cutout) will trip at any of the

following conditions:

• 14 V side trips at voltage higher than regulator

setpoint that exists longer than 3 seconds of reading

voltage above 16 V. OVCO feature detects overvoltage

and reacts by disabling the alternator field circuit.

This turns off alternator. OVCO circuit will reset by

either:

— Restarting engine (regulator regains control of

alternator output voltage) OR

— System voltage on both 14 and 28 volt batteries

falling below 11 V. OVCO will automatically reset.

• 28 V side trips at voltage higher than regulator

setpoint that exists longer than 3 seconds of reading

voltage above 32 V. OVCO feature detects overvoltage

and reacts by disabling the alternator field circuit.

This turns off alternator. OVCO circuit will reset by

either:

— Restarting engine (regulator regains control of

alternator output voltage) OR

— System voltage on both 14 and 28 volt batteries

falling below 11 V.

Troubleshooting

Shut down vehicle and restart engine. If alternator

functions normally after restart, a “no output condition”

was normal response of voltage regulator to overvoltage

condition. Inspect condition of electrical system, includ-

ing loose battery cables, both positive and negative. If

battery disconnects from system, it could cause overvolt-

age condition in electrical system, causing OVCO circuit

to trip.

If you have reset alternator once, and electrical system

returns to normal charge voltage condition, there may

have been a one time, overvoltage spike that caused

OVCO circuit to trip.

If OVCO circuit repeats cutout a second time in short

succession and shuts off alternator field circuit, try third

restart. If OVCO circuit repeats cutout a third time, go to

Chart 3a or 3b, page 7.

1 2 3 4 5 6 7 8

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