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ESD2100 Electronic Speed Control Unit
09.06.16
PIB 1022
D
INSTABILITY
INSTABILITY SYMPTOM
PROBABLE CAUSE OF
ABNORMAL READING
Fast Periodic
The engine seems to jitter
with a 3Hz or faster irregulari-
ty of speed.
1.
2.
3.
Remove the E1 to E2 jumper. Readjust GAIN and Stability afterward.
Jumper between E4 and E5 may be removed to further stabilize the system.
Turn off other electrical equipment that may be causing interference.
Slow Periodic
An irregularity of speed below
3Hz.
1.
2.
3.
Readjust the GAIN and STABILITY
Adjust the DEAD TIME COMPENSATION by adding a capacitor from posts E2 to E3 (negative on E2).
Start with 10 mfds. and increase until instability is eliminated.
Check fuel system linkage during engine operation for:
a. binding
b. high friction
c. poor linkage
Non-Periodic
Erratic Engine Behavior
1.
2.
Increasing the GAIN should reduce the instability but not totaly correct it.
If this is the case, there is most likely a problem with the engine itself.
Check for:
a. engine mis-fi rings
b. an erratic fuel system
c. load changes on the generator set
voltage regulator.
If throttle is slghtly erratic, but performance is fast, then removing the jumper from E4 to E5 will tend to
steady the system.
720 Silver Street,
Agawam, MA 01001 USA
www.governors-america.com
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 VAC 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 small-
er 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.
INSUFFICIENT MAGNETIC SPEED SIGNAL
