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WARNING
Hazardous voltage.
Can cause severe injury or death.
Operate generator set only with all guards and
electrical enclosures in place.
Grounding generator set. Hazardous voltage can
cause severe injury or death. Electrocution is possible
whenever electricity is present.
breakers of all power sources before servicing equipment.
Configure the installation to electrically ground the
generator set and electrical circuits when in use. Never
contact electrical leads or appliances when standing in
water or on wet ground, as the chance of electrocution is
increased under such conditions.
WARNING
Rotating parts.
Can cause severe injury or death.
Do not operate generator set without all guards,
screens, and covers in place.
Exposed moving parts can cause severe injury or
death. Keep hands, feet, hair, and clothing away from
belts and pulleys when unit is running. Replace guards,
covers, and screens before operating generator set.
2
Moving rotor.
Open main circuit
The governor system consists of
isochronous governor, an electro-mechanical stepper
motor, and a magnetic pickup. Electrical pulses are
supplied by the magnetic pickup to the isochronous
governor (control unit) each time one of the ring gear teeth
passes the pickup. The control unit compares the
frequency of these pulses to a preset reference and
provides a signal to the stepper motor which controls the
carburetor throttle position and the engine speed. This is a
closed-loop system and typically provides steady-state
speed regulation of ± 0.25%.
The factory sets the electronic governor and the governor
usually requires no further adjustment. If the unit operates
erratically, check the following items before readjustment.
D Check the carburetor for dirt, grime, or
misadjustment. Also, check the idle-adjustment
screw. The screw should not prevent the throttle
plate from completely closing. Also, check the
throttle linkage for any binding, dirt, damage, etc.
D Check electrical connections— check the stepper
motor, controller box, and governor connector
(inside the controller) for clean and tight
connections.
D Check electrical ground connections— a good DC
ground must be provided to the controller
assembly and governor circuit.
D Check for a good positive 12-volt DC supply. Also
check if the positive voltage supply is unstable or
below 8-volts DC making the control unit function
erratically.
D Check magnetic pickup connections. Poor
connections may cause the signal to be erratic.
As long as this erratic signal is being sent, the unit
will not shut down due to loss of pickup.
D Check for dirt buildup on magnetic pickup— metal
filings or caked-on dirt/grease may decrease the
output signal of the magnetic pickup.
D Check for a loose coupling screw.
D Check for stepper motor/throttle shaft coupling
wear— if the roll pin wore the slot of the stepper
motor coupling, loosen coupling screw and move
coupling so that roll pin is positioned at a point in
stepper motor coupling without wear. Tighten
coupling screw.
an electronic
SB-555 5/96
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