GAC ESD5151 Посібник із швидкого старту - Сторінка 2

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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 clockwise 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 avail-

able with the internal control. Droop level requirements

above 10% are unusual.

If droop levels experienced are higher or lower then these

required, contact the GAC for assistance.

After the droop level has been adjusted, the rated engine

speed setting may need to be reset. Check the engine 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 sys-

tem accessories, GAC accessories are directly connected to

this terminal. 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 M ohm resistor should be con-

nected 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 frequen-

cy range, a jumper wire or frequency trim control may be

required between Terminals G and J. This increases the fre-

quency range of the speed control to over 7000 Hz.

Accessory Supply

The +10 volt 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.

Wide Range Remote Variable Speed Operation

Simple and effective remote variable speed can be obtained

with the ESD5100 Series speed control unit.

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 corre-

sponding potentiometer value. (Refer to TABLE 1.) 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 Dia-

gram 1

To maintain engine stability at the minimum speed setting, a

This document is subject to change without notice.

Caution: None of GAC products are flight certified controls including this item.

small amount of droop can be added using the DROOP ad-

justment. At the maximum speed setting the governor per-

formance will be near isochronous, regardless of the droop

adjustment setting.

Contact GAC for assistance if difficulty is experienced in ob-

taining the desired variable speed governing performance.

TAblE 1 VARIAblE RANGE pOTENTIOMETER VAlUE

SpeeD RAnge

900 Hz

2,400 Hz

3,000 Hz

3,500 Hz

3,700 Hz

DIAGRAM 1 pOTENTIOMETER WIRING

*Select proper potentiometer value from Table 1

SYSTEM TROUblEShOOTING

Insufficient Magnetic Speed Signal

A strong magnetic speed sensor signal will eliminate the

possibility of missed or extra pulses. The speed control unit

will govern well with 0.5 volts RMS speed sensor signal. A

speed sensor signal of 3 volts RMS or greater at governed

speed is recommended. Measurement of the signal is made

at Terminals C and D.

The amplitude of the speed sensor signal can be raised

by reducing the gap between the speed sensor tip and the

engine ring gear. The gap should not be any smaller than

0.020 in (0.45 mm). When the engine is stopped, back the

speed sensor out by 3/4 turn after touching the ring gear

tooth to achieve a satisfactory air gap.

Electromagnetic Compatibility (EMC)

EMI SUSCEPTIBILITY - The governor system can be ad-

versely affected by large interfering signals that are conduct-

ed through the cabling or through direct radiation into the

control circuits.

All GAC speed control sensors contain filters and shielding

designed to protect the unit's sensitive circuits from moder-

ate external interfering sources.

potentiometeR VAlue

1 K

5 K

10 K

25 K

50 K

PIB1000 C