Kohler EKOZD Series Service page 158

When replacing the current transformer or stator
assembly, install the current transformer according to
the generator reconnection decal on the generator set,
or see the wiring diagrams. Observe the correct current
transformer position when installing the stator leads.
The current transformer dot or HI mark position and the
stator lead direction are essential for correct component
function. The dot or HI mark should face toward the
stator.
See the full wiring diagram in Section 17
Figure 9-8 Current Transformers
Two styles of current transformers are used. Round
(doughnut) styles have black/white leads with no
mounting provisions. The square styles have two #8-32
studs/nuts for connecting the leads and four notches in
the base for mounting.
A current transformer contains a coil of wire that induces
a secondary voltage/current from the primary or stator
lead passing through the center. The number of coil
turns inside the current transformer determines the
ratio. Replacement current transformers must have the
same ratio as the original.
9.6.2 Testing
Use an ohmmeter to check the current transformer.
Perform this test with the current transformer
disconnected from the generator set. A resistance
reading of infinity or 0 ohms suggests an open or shorted
current transformer that needs replacement. Consider
any other resistance reading acceptable.
158 Section 9 Component Testing and Adjustment
9.7 Engine Pressure and
9.7.1
Use this section to test engine sensors (switches or
senders) installed by the generator set manufacturer on
the engine. Refer to the respective engine service
manual for testing sensors installed by the engine
manufacturer.
Use the following tests to determine if the engine sensor
installed by the generator set manufacturer is functional.
All sensors should have part numbers stamped on the
metal housing. In cases where the number is illegible or
missing, refer to the respective generator set parts
catalog for the corresponding part number. The user
must determine the sensor part number in order to
determine the sensor specifications which are found in
.
Section 1, Specifications.
ADV8672-
The sensors can be installed on the generator set
provided the leads are disconnected and a temperature
or pressure gauge is available to determine the engine
values. Otherwise, remove the sensor after draining the
respective engine fluid (oil or coolant) and test using a
separate pressure or temperature source.
The resistance of the oil pressure and water
temperature sender output signals varies as the
respective pressure and temperature change. Use the
resistance change for verification of sender function.
Disconnect all leads from the sender before checking
resistance. If the sender functions and the gauge does
not function, check the engine wiring harness, leads,
and connectors before replacing the display board.
Some generator sets may have senders/switches
incorporated with the engine ECM (electronic control
module). Identify engine ECM senders/switches by lead
designations listed in the following testing information.
Refer to the wiring diagrams for additional lead
identification information. Use the engine service
manual for troubleshooting ECM senders/switches.
9.7.2
The sensors referenced in this section typically provide
the following controller inputs:
D
D
D
D
D
D
D
Temperature Sensors
General
Sensor Types
High engine temperature shutdown switch
High engine temperature warning (prealarm) switch
Low oil pressure shutdown switch
Low oil pressure warning (prealarm) switch
Low water temperature warning switch
Oil pressure gauge sender (see Section 9.7.5)
Coolant temperature gauge sender (see Section 9.7.6)
TP-6953 7/19