MVME5500輸出卡件
檢查執行器連桿與燃油控制任何空轉、束縛或超載。驗證燃料是否穩定適當值的壓力。
按照適當的執行機構檢查執行機構手冊原動(dòng)機不工作正確地原動(dòng)機可能導致速度變化。手動(dòng)控制發(fā)動(dòng)機至確定原動(dòng)機是否不穩定，或調速器控制。驗證調整是否正確燃料控制連桿的。
輸入電壓低
檢查電源電壓，至少應為低壓控制裝置上的20 Vdc和90 Vdc在高壓控制上為88 Vac。速度設定控制不調節速度。故障額定速度或速度微調電位計。
用跳線(xiàn)替換速度微調進(jìn)行檢查并與主速度一起設置速度電位計。原動(dòng)機未接收燃料as州長(cháng)要求的。
如果致動(dòng)器的電壓最大（最小對于反向作用），目視確定
致動(dòng)器軸處于最大位置。如果是否則，指示執行器故障，或
連桿或燃油系統受限。速度設置不相等。確保所有機組的速度設置為“否”負載相同。
負載增益電壓不相等。原動(dòng)機在單機組配置，必須設置負荷增益在6.0VDC下。參見(jiàn)中的“負載增益調整”
斷路器輔助觸點(diǎn)或者下垂觸點(diǎn)斷開(kāi)。
檢查輔助斷路器和下垂聯(lián)絡(luò )。檢查來(lái)自的18至40 Vdc低壓控制上的端子14至15。
高壓控制只能測量從14號端子到18號端子，如果接近
超馳故障：速度信號觸點(diǎn)不存在關(guān)閉
負載感應和定相不當。執行第3章中的定相程序。之間的循環(huán)電流發(fā)電機。
請參閱相應的電壓調節器手冊原動(dòng)機維持恒速（等時(shí)）。
致動(dòng)器。如果致動(dòng)器有球頭備份，驗證
其液壓調速器部分，速度
設置和速度降調整為：正確設置（參見(jiàn)適用的調速器手動(dòng)）。
原動(dòng)機。如果僅在滿(mǎn)負荷點(diǎn)附近出現下降，原動(dòng)機可能不是產(chǎn)生燃料所需的動(dòng)力
控件或正在過(guò)載。要么是
如果燃油控制處于最大值，則指示位置
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
20 Vdc on low voltage controls and 90 Vdc
or 88 Vac on high voltage controls.
Speed-setting
control does not
regulate speed.
Faulty RATED SPEED or Speed
Trim potentiometer.
Check by replacing Speed Trim with jumper
and setting speed with main speed
potentiometer. Prime mover not receiving fuel as
called for by the governor.
If voltage to actuator is maximum (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, LOAD GAIN must be set
at 6.0 Vdc. See “Load Gain Adjustment” in
Chapter 3.
Circuit breaker auxiliary contact
or droop contact is open.
Check auxiliary circuit breaker and droop
contacts. Check for 18 to 40 Vdc from
terminal 14 to 15 on low voltage controls.
NOTE
High voltage controls can only be measured
from terminal 14 to 18 if the close to
override failed speed signal contact is not
closed.
Improper load-sensing phasing. Perform phasing procedure in Chapter 3.
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 droop occurs near the full-load point only,
it is possible the prime mover is not
producing the power called for by the fuel
control, or is being overloaded. Either is
indicated if the fuel control is at maximum
position.
