Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 146 / 182

2301E Digital Control Manual 26641
136 Woodward
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
(continued). Prime mover may not be receiving
fuel as called for by the actuator
voltage. Check actuator linkage to fuel controlling
mechanism for any lost motion, binding, or
excessive loading. Verify a steady fuel
pressure of proper value.
Check actuator per appropriate actuator
manual.
Prime mover not operating
properly. Prime mover may be causing speed
variations. Control engine manually to
determine if instability is in prime mover or
governor control. Verify proper adjustment of
fuel control linkage.
Input voltage low. Check supply voltage. It should be at least
18 Vdc.
Prime mover does not
share load with other
units. Prime mover not receiving fuel as
called for by the governor. If voltage to actuator is maximum (~7 Vdc)
(minimum for reverse acting), visually
determine if actuator shaft is at maximum
position. If it is not, an actuator problem is
indicated, or the linkage or fuel system is
restricted.
Unequal speed settings. Be sure that speed settings of all units at no
load are identical.
Unequal load gain voltages. With the prime mover operating in single unit
configuration, verify calibration of KW Input
in Service Menu T
Circuit breaker auxiliary contact or
droop contact is open. Check auxiliary circuit breaker and droop
contacts (if used and programmed for).
Improper load sensing phasing. Perform phasing procedure in Chapter 4.
Circulating currents between
generators. Refer to appropriate voltage regulator
manual.
Prime mover does not
maintain constant speed
(isochronous). Actuator. If actuator has a ballhead backup, verify that
its hydraulic governor section, speed setting,
and speed droop adjustments are properly
set (see the applicable governor manual).
Prime mover. If the droop occurs near the full-load point
only, it is possible the prime mover is not
producing the horsepower called for by the
fuel control, or is being overloaded. Either is
indicated if the fuel control is at maximum
position.