PLUG-ORIFICE 8S9094 - Caterpillar

Adjustments On Utility Voltage Sensor Circuit Board
Utility Voltage Sensor Circuit BoardThe Utility Voltage Sensor circuit board mounts easily adjustable potentiometers for Voltage Dropout Sensor setting, Voltage Pickup Sensor setting, and Line Interrupt Delay Timer. Voltage Dropout Sensor - Establishes the normal power source voltage at which generator startup signal will occur. The adjustable potentiometer is factory set to about 80% of the Voltage Pickup Sensor setting; it may be reset to any voltage between 75-95% of the Pickup Sensor setting by simply turning the adjustment knob to the desired percentage. Voltage Pickup Sensor - Establishes the normal source voltage at which re-transfer back to that power source and generator shutdown will be initiated. The Sensor is factory set to approximately 90% of the rated normal source voltage; it may be reset to any voltage between 85-95% of the nominal rated normal source voltage. Line Interrupt Delay Timer - Establishes the time interval between dropout of normal source voltage below the Voltage Dropout setting and generator startup signal. The timer is factory set to about five seconds; it may be reset to any time interval between 0.1 and 10 seconds. On earlier units, the Dropout and Pickup potentiometers allow settings that are outside the limits that are given above. Adjust the earlier units to the settings given above. On later units, the Dropout and Pickup potentiometers have stops which do not allow settings that are outside the limits that are given above. Establishment of a time delay between normal source dropout and generator startup is necessary, to prevent false starts that might be caused by transient voltage dips.Microprocessor Based Control Circuit Board Adjustments
Adjustments On Microprocessor Based Control Circuit Board
(1) Engine Warmup Timer Bypass Switch. (2) Transfer On Exercise Selector Switch. (3) Test Jumper For Accelerated Exercise Test. (4) Set Exercise Time Switch. Also see the subject The 7-Day Exercise Cycle For Microprocessor Based Controls in the Operating Instructions section. Engine Warmup Timer Bypass Switch (1) - Following automatic generator startup, transfer to the standby power source will not occur until (a) the generator engine has warmed up for a fixed setting of about 30 seconds, and (b) generator AC output voltage and frequency have reached approximately 80% of the nominal rated values.If desired, the circuit board's Engine Warmup Timer may be bypassed by means of this bypass switch. Transfer to standby will then occur as soon as standby voltage and frequency reach 80% of rated voltage. To bypass the Timer, move Switch 1 away from its OFF position (toward the number 1). To place the Warmup Timer back into operation, set the switch to OFF. Transfer on Exercise Selector Switch (2) - On the circuit board, locate the switch identified by the words "XFR ON EX." If it is desired to transfer the load to the standby source during the exercise cycle, set Switch 2 away from the OFF position (toward the number 2). For no transfer during the exercise cycle, set the switch to OFF. Selecting the Day