P-OPEN-P4-150PAC-OP150P4運(yùn)動(dòng)控制模塊
對(duì)于致動(dòng)器電流為20至160 mA的控制器，最小燃料定義為：
?正向作用控制的致動(dòng)器電流小于10 mA。
?執(zhí)行器電流大于180 mA，用于反向動(dòng)作控制。
對(duì)于致動(dòng)器電流為40至320 mA的控制器，最小燃料定義為：
?正向作用控制的致動(dòng)器電流小于20 mA。
?反向作用控制的致動(dòng)器電流大于360 mA。
可串聯(lián)連接超越故障轉(zhuǎn)速信號(hào)電路的觸點(diǎn)端子18和端子16（或高壓控制上的端子0）。
暫時(shí)閉合觸點(diǎn)會(huì)覆蓋故障的速度信號(hào)電路，該電路可能需要啟動(dòng)。
由于安裝的多樣性以及系統(tǒng)和部件公差，控制必須調(diào)整到每個(gè)系統(tǒng)以獲得最佳性能。這個(gè)用于設(shè)置和調(diào)整這些電路的電位計(jì)位于上部控件的右角，如圖4-2所示。它們包括：
?額定轉(zhuǎn)速電位計(jì)
?起動(dòng)燃油限制電位計(jì)
?復(fù)位、增益和致動(dòng)器補(bǔ)償
?斜坡時(shí)間和低怠速電位計(jì)調(diào)整額定轉(zhuǎn)速電位計(jì)，以便在額定轉(zhuǎn)速下轉(zhuǎn)換器速度電壓和參考速度電壓相等。
起動(dòng)燃油限制電位計(jì)提供限制燃油架的方法起動(dòng)柴油發(fā)動(dòng)機(jī)時(shí)的位置。電位計(jì)的調(diào)整設(shè)置所需的最大致動(dòng)器位置。此限制位置將自動(dòng)啟用并在速度控制接管時(shí)關(guān)閉。
復(fù)位、增益和執(zhí)行器補(bǔ)償電位計(jì)調(diào)整控制放大器，以適應(yīng)各種類型的原動(dòng)機(jī)系統(tǒng)。這個(gè)復(fù)位調(diào)整會(huì)影響原動(dòng)機(jī)在故障后恢復(fù)時(shí)的反應(yīng)時(shí)間負(fù)載突然變化。由于通過(guò)調(diào)整增益來(lái)控制負(fù)載的突然變化。致動(dòng)器補(bǔ)償補(bǔ)償執(zhí)行器和原動(dòng)機(jī)的時(shí)間系統(tǒng)需要對(duì)來(lái)自控制器的信號(hào)作出反應(yīng)。
原動(dòng)機(jī)從怠速加速到額定轉(zhuǎn)速所需的時(shí)間，以及建議的怠速與緩變時(shí)間和低怠速一起設(shè)置分別為速度電位計(jì)。
For controls with actuator current of 20 to 160 mA, minimum fuel is defined as:
? Actuator current less than 10 mA for forward-acting controls.
? Actuator current greater than 180 mA reverse-acting controls.
For controls with actuator current of 40 to 320 mA, minimum fuel is defined as:
? Actuator current less than 20 mA for forward-acting controls.
? Actuator current greater than 360 mA for reverse-acting controls.
A contact to override the failed-speed-signal circuit can be connected in series
with terminal 18 and terminal 16 (or terminal 0 on high voltage controls).
Temporarily closing the contact overrides the failed-speed-signal circuit, which
may be required for start-up.
Because of the variety of installations, plus system and component tolerances,
the control must be tuned to each system for optimum performance. The
potentiometers for setting and adjusting these circuits are located in the upper
right corner of the control as shown in Figure 4-2. They include:
? the RATED SPEED potentiometer
? the START FUEL LIMIT potentiometer
? RESET, GAIN, and ACTUATOR COMPENSATION
? RAMP TIME and LOW IDLE SPEED potentiometers
The RATED SPEED potentiometer is adjusted so that at rated speed, the
converter-speed voltage and the reference-speed voltage are equal.
The START FUEL LIMIT potentiometer provides a means of limiting the fuel-rack
position when starting diesel engines. Adjustment of the potentiometer sets the
maximum actuator position desired. This limit position is automatically enabled
prior to start-up, and is turned off when speed control takes over.
RESET, GAIN and ACTUATOR COMPENSATION potentiometers adjust the
control amplifier to accommodate various types of prime-mover systems. The
RESET adjustment affects prime mover reaction time when recovering after a
sudden load change. The magnitude of the speed change resulting from a
sudden change in load is controlled by adjusting the GAIN. ACTUATOR
COMPENSATION compensates for the time the actuator and prime mover
system takes to react to signals from the control.
The time taken by the prime mover to accelerate from idle to rated speed, and
the recommended idle speed, are set with the RAMP TIME and LOW IDLE
SPEED potentiometers respectively.
