Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 145 / 182

Manual 26641 2301E Digital Control
Woodward 135
Symptom Cause Solution
Prime mover will not
stabilize at rated no load
speed. The instability
may occur at no load or it
may vary with load
Control may be erratic. 2301E control. Adjust GAIN, RESET, and ACTUATOR
COMPENSATION as desc
ribed in “Adjust
for Stable Operation” and “Dynamic
Adjustment” in Chapter 4.
Speed reference controls. Check display menu. The speed reference
value should be constant. If speed
reference is erratic, check remote input (if
used), intermittent raise/lower contact
inputs. The speed bias sum at no load
should be constant.
Improper linkage adjustment. Make sure that actuator moves
approximately 2/3 of its travel from no load
to full load. Be sure linkage is linear on
turbine, diesel, and fuel-injected prime
movers. Be sure linkage is non-linear on
carbureted prime movers. Refer to actuator
manual for proper installation.
Necessary external wires not
properly shielded.
Electrical noise, caused by wiring
carrying an ac voltage, stray
magnetic fields from transformers,
etc., can be picked up by
improperly shielded wire. Noise
will cause instability if picked up by
lines associated with the amplifier
summing point such as external
speed trim, paralleling lines, droop
contact, magnetic pickup lines,
and synchronizer input. The following tests will isolate noise and
interference.
Verify that the switchgear frame, governor
chassis, and prime mover have a common
ground connection. Temporarily remove the
battery charger cables from the control
battery system.
If the prime mover operation is significantly
improved by these modifications, replace
the wiring one at a time to locate the source
of the trouble.
External wiring may require additional
shielding or rerouting from high-current
lines or components.
If the problem cannot be resolved by these
checks, it will be necessary to remove the
2301E control from the switchgear.
Temporarily mount it next to the prime
mover and connect only a battery, magnetic
pickup, and actuator to the control (use a
separate battery placed next to the prime
mover).
If stability occurs when the control is
mounted next to the prime mover, return the
control to the switchgear. Run new
magnetic pickup, actuator, and battery
power lines. Shield all wires to the control.
Route all wires through conduit or an outer
shield. Tie the outer shield to system
ground at end opposite of the control.