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Handleiding Generac QT15068AVSNA Generator

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Handleiding

ENGINE PROTECTIVE DEVICES

The Stationary Emergency Generator may be required to operate

for long periods of time without an operator on hand to monitor

such engine conditions as coolant temperature, oil pressure or

rpm. For that reason, the engine has several devices designed to

protect it against potentially damaging conditions by automatically

shutting down the unit when the oil pressure is too low, the coolant

temperature is too high, the coolant level is too low, or the engine

is running too fast.

NOTE:

Engine protective switches and sensors are mentioned here for

the reader's convenience. Also refer to the applicable control

panel manual for additional automatic engine shutdown infor-

mation.

COOLANT TEMPERATURE SENSING

An analog Water Temperature Sender (WTS) is located in the

engine's cooling system. This sender is connected to the panel

and allows the panel to monitor and display the temperature of the

coolant system.

The WTS is a resistive device whose resistance changes based

on coolant temperature. The resistance of the sender results in a

voltage being developed across the sender. As the Coolant tem-

perature increases, the resistance will decrease, causing the volt-

age to decrease. This changing voltage is converted to 4-20mA

signal by a signal conditioner module. The corresponding 4-20mA

signal is read by the control panel and displayed as the coolant

temperature.

The control panel will monitor and display the coolant temperature

anytime the DC input to the control panel is present.

If the temperature exceeds approximately 140° C (284° F), the

engine shutdown will be initiated. The generator will automatically

restart and the display will reset once the temperature has returned

to an operating level.

LOW COOLANT LEVEL

A Low Coolant Level (LCL) sensor is placed in the generators cool-

ant system. This sensor allows the panel to detect a Low Coolant

Level condition.

The LCL is a resistive device whose resistance changes rapidly

based on the presence or absence of coolant.

The resistance of the LCL results in a voltage being developed

across the LCL. This voltage changes as the resistance changes.

This changing voltage is converted to 4-20mA signal by a signal

conditioner module. The corresponding 4-20mA signal is read by

the control panel and displayed as the low coolant level.

If the level of the engine coolant drops below the level of the low

coolant level sensor, the engine shutdown will be initiated.

OIL PRESSURE SENSING

An analog Oil Pressure Sender (OPS) is used for monitoring the

engine oil pressure. This sender allows the control panel to mea-

sure and display the Engine oil pressure.

The OPS is a resistive device, whose resistance changes based

on engine oil pressure. The resistance of the sender results in a

voltage being developed across the sender. As the oil pressure

increases, the resistance will decrease, causing the voltage to

decrease. This changing voltage is converted to 4-20mA signal by

a signal conditioner module. The corresponding 4-20mA signal is

read by the control panel and displayed as the oil pressure.

The control panel will monitor and display oil pressure anytime the

DC input to the control panel is present.

Should the oil pressure drop below the 8 psi range, the engine

shutdown is initiated. The unit should not be restarted until oil is

added. Turn the AUTO/OFF/ MANUAL switch to the OFF position,

then back to AUTO to restart.

OVERCRANK SHUTDOWN

When the control panel receives a start signal, it initiates the pro-

grammed starting sequence. The start sequence consists of the

number of crank attempts, the length of each crank attempt, and

the rest time between each crank attempt. If the engine has not

started by the end of the final crank attempt, an Overcrank alarm

is generated, the control panel will sound the alarm and display the

message "Failed to start".

OVERSPEED SHUTDOWN

A speed circuit controls engine cranking, start-up, operation and

shutdown. Engine speed signals are delivered to the circuit board

whenever the unit is running. Should the engine over speed above

a safe, preset value, the circuit board initiates an automatic engine

shutdown. Contact the nearest Authorized Dealer if this failure

occurs.

RPM SENSOR LOSS SHUTDOWN

If the speed signal to the control panel is lost, engine shutdown

will occur.

DC FUSE

This fuse is located inside of the control panel. It protects the panel

wiring and components from damaging overload. Always remove

this fuse before commencing work on the generator. The unit will

not start or crank if the fuse is blown. Replace the fuse with one of

the same size, type, and rating. (See the exploded views and parts

lists at the end of this manual for replacement part number.)

4-1

EngProt002 Rev. D 06/10

Engine Protective Devices

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