TP-6881 7/15 103Section 5 Component Testing and Adjustment
5.16 Continuity Checks
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving parts.
WARNING
Short circuits. Hazardous voltage/current can cause
severe injury or death. Short circuits can cause bodily injury
and/or equipment damage. Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
Testing live electrical circuits. Hazardous voltage or
current can cause severe injury or death. Have trained and
qualified personnel take diagnostic measurements of live
circuits. Use adequately rated test equipment with electrically
insulated probes and follow the instructions of the test
equipment manufacturer when performing voltage tests.
Observe the following precautions when performing voltage
tests: (1) Remove all jewelry. (2) Stand on a dry, approved
electrically insulated mat. (3) Do not touch the enclosure or
components inside the enclosure. (4) Be prepared for the
system to operate automatically.
(600 volts and under)
To further check generator set components, disconnect
the battery and remove wiring harness plugs from the
controller circuit board. Use an ohmmeter to check the
continuity of the components listed in Figure 5-37. Also
see Section 7, Wiring Diagrams.
Figure 5-37 gives resistance readings for functional
components. A zero reading on the ohmmeter indicates
continuity. No ohmmeter reading indicates very high
resistance or an open circuit. A measurement that
varies significantly from the value shown in the table
indicates a faulty component; replace faulty
components.
Note: Disconnect the generator set battery before
performing continuity checks to prevent damage
to the ohmmeter.
For rotor and stator resistance and continuity checks,
see Section 5.4, Stator, and Section 5.5, Main Field
(Rotor).
Component
Ohmmeter
Connections
Ohmmeter
Scale
Generator Set
State
Ohmmeter Readings for
Operative Components
P1 wiring harness P1-2 and ground Rx1 OFF Less than 1 ohm (continuity)
Any other reading indicates a poor
ground connection.
P2-6 and P2-7 (stator
leads 11 and 44)
Rx1 OFF Less than 1 ohm (continuity). If no
continuity, check wiring.
P2-3 and P2-4 (stator
leads 55 and 66)
Rx1 OFF Less than 1 ohm (continuity). If no
continuity, check wiring.
Controller wiring P1-1 and battery positive
(+)
R x 100 OFF Less than 1 ohm (continuity). If no
continuity is found, check wiring.
Auxiliary winding breaker
(20-amps)
P2-3 and stator lead 55 R x 100 OFF Less than 1 ohm (continuity). If no
continuity is found, check for an open
circuit.
Low oil pressure (LOP)
switch *
Lead 13 and ground
(engine block)
R x 100 OFF Less than 1 ohm (continuity). No
continuity indicates a faulty switch
and/or wiring.
Temperature sensor
(OTS) *
P1-9 and P1-10 R x 1000 OFF 180--2500 ohms, depending on en-
gine temperature. See Sec-
tion 5.12.2. Less than 1 ohm or an
open circuit indicates faulty wiring or
a faulty sensor.
* See Section 5.12.2, Fault Shutdown Switches
Figure 5-37 Continuity Checks
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