GAC ESD-5550 Series Technische Informationen - Seite 5
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Technical Information
Speed Droop Operation
Droop is typically used for the paralleling of engine driven generators.
Place the optional external selector switch in the DROOP position. DROOP is increased by CW
rotation of the DROOP adjustment control. When in droop operation, the engine speed will
decrease as engine load increases. The percentage of droop is based on the actuator current
change from engine no load to full load. A wide range droop is available with the internal control.
Droop level requirements above 10% are unusual.
If droop levels experienced are higher or lower then these required, contact for assistance.
After the droop level has been adjusted, the rated engine speed setting may need to be reset.
Check the engines speed and adjust that speed setting accordingly.
Accessory Input
The AUXiliary Terminal N accepts input signals from load sharing units, auto synchronizers, and
other governor system accessories. It is recommended that this connection from accessories be
shielded as it is a sensitive input terminal.
If the auto synchronizer is used alone, not in conjunction with a load sharing module, a 3 0 resister
should be connected between Terminals N and P.
This is required to match the voltage levels between the speed control unit and the synchronizer.
When an accessory is connected to Terminal N, the speed will decrease and the speed adjustment
must be reset.
When operating in the upper end of the control unit frequency range, a jumper wire or frequency
trim control may be required between Terminals G & J. This increases the frequency range of the
speed control to over 7000 Hz.
Accessory Supply
The +10 VDC regulated supply, Terminal P, can be utilized to provide power to GAC governor
system accessories. Up to 20 mA of current can be drawn from this supply. Ground reference is
Terminal G. Caution: a short circuit on Terminal P could damage the speed control unit.
Wide Range Remote Variable Speed Operation
Simple and effective remote variable speed can be obtained with the ESD-5550/5570 Series
control unit using an external potentiometer.
A single remote speed adjustment potentiometer can be used to adjust the engine speed
continuously over a specific speed range. Select the desired speed range and corresponding
potentiometer value. (Refer to Table 4.) If the exact range cannot be found, select the next higher
range potentiometer. An additional fixed resistor may be placed across the potentiometer to obtain
the exact desired range. Connect the speed range potentiometer as shown in Diagram 1.