Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 144 / 182

2301E Digital Control Manual 26641
134 Woodward
Symptom Cause Solution
Prime mover overspeeds
after operating at rated
speed for some time. Prime mover. Check for proper operation of prime mover
fuel system. If actuator moves toward
minimum fuel during overspeed, problem is
in fuel system.
Magnetic pickup and 2301E
control. Check the magnetic pickup output voltage
at speeds above idle
—at least 1.0 Vrms. If
magnetic pickup should fail and the override
failed speed signal circuit is disabled, the
2301E control will call for maximum fuel.
2301E control. Control the prime mover manually at rated
speed. If the Engine Speed reading in the
Display Menu does not match external
indicators, the control is not configured
properly. When the engine speed value is
greater than the speed reference value, the
output voltage should be zero. If speed
range is correct for the application, replace
the control.
Low speed is not
regulated by LOW IDLE
SPEED.
On carbureted prime movers,
the minimum fuel stop rpm
setting will vary with prime
mover temperature. An
improper cold setting may give
interference with the LOW IDLE
SPEED setting when the prime
mover is hot.
The LOW IDLE SPEED setting may be
below the minimum fuel position of the
actuator or prime mover fuel stop. In this
case, the output voltage to the actuator will
be zero.
The engine will be maintained at the
minimum fuel position by the actuator or the
prime mover minimum fuel stop. The
conditions above indicate that the prime
mover minimum fuel position should be
decreased by linkage adjustment (diesel
engine) or low idle set screw (gas engine),
or the LOW IDLE SPEED setting should be
raised. If this action does not correct the
problem, the 2301E control may be faulty.
Prime mover does not
decelerate when Close
for Rated contact is
open. Faulty Close for Rated contact. Check Close for Rated contact, if used, and
the discrete input is programmed for Idle /
Rated Speed.
LOW IDLE SPEED set the same
as rated Check the Speed Settings Menu.
Generator Aux contact is closed. A faulty Close for Rated contact may
remain in the accelerate position with the
contact open.
In general, adjustment of LOW IDLE
SPEED will vary the speed of the prime
mover with the Close for Rated contact in
the decelerate (open) position. Adjustment
of LOW IDLE SPEED should not affect
prime mover speed when the Close for
Rated contact is closed.