8
ESD5300 Speed Control Unit
09-2020-H
PIB1041
Governors America Corp. © 2020 Copyright All Rights Reserved
The AUXiliary input, Terminal M. directly accepts output signals from GAC load Sharing units, Auto Synchronizers and other governor
system accessories. Consult the applicable GAC publications for details. It is recommended that this connection from accessories be a
shielded cable as it is a sensitive input terminal.
If the GAC Auto Synchronizer is used alone, not in conjunction with a load Sharing Module, a resistor must be installed be-
tween Terminals M and L. If a frequency trim potentiometer is also used, the resistor should be 910 K Ω. If no frequency trim is
used, the resistor should be 1.2M Ω. This is required to match the voltage levels between the ESD5300 speed controller and
the synchronizer.
noTe
The +10 V regulated supply, Terminal l, can be utilized to provide power to GAC governor system accessories. Up to 40 mA of current
can be drawn from this supply. The ground reference for this supply is Terminal G.
10
SYSTEm TROUBlEShOOTINg
If the engine governing system does not function, the fault may be determined by performing the voltage tests described in Steps 1
through 3. Positive (+) and negative (-) refer to meter polarity. Should normal values be indicated during troubleshooting steps, then the
fault may be with the actuator or the wiring to the actuator. Tests are performed with battery power on and the engine off, except where
noted. See your actuator publication for the testing procedure for that actuator.
Hertz
MAG PICKUP
= (RPM x #Teeth)
60sec
RPM =
(Hertz
MAG PICKUP
x 60sec)
#Teeth
conversion formulas
STeP
WIreS
normaL reaD-
InG
ProBaBLe caUSe of
aBnormaL reaDInG
1
D(+)&C(-)
Battery Supply
Voltage
1.
2.
3.
DC battery power not connected. Check for blown fuse
low battery voltage
Wiring error
2
e & F
1.0 V AC RMS min.
while cranking
1.
2.
3.
Gap between speed sensor and gear teeth too great. Check Gap
Improper or defective wiring to the speed sensor. Resistance between 3 and Ground should be 160
to 1200 ohms. See your specific magnetic pickup data for resistance.
Defective speed sensor.
3
l(+)&G(-)
10 VDC,
Internal Supply
1.
2.
Short on Terminal P. ( This will cause a defective unit)
Defective speed control unit
4
A(+)&C(-)
2.0 V less than bat-
tery voltage while
cranking
1.
2.
3.
4.
5.
6.
Starting FUel lIMIT set too low.
IDle set too low.
SPeeD adjustment set too low.
Wiring error to the actuator.
Defective speed control.
Defective actuator.
acceSSorY InPUT
ADDITIONAl FEATURES (CONTINUED)
9
acceSSorY SUPPLY
SYSTem InoPeraTIve
