Ecu-Electronic Control Unit; Setting/Changing Engine Speed - Westerbeke 6.5 MCG Service Manual

ELECTRONIC CONTROL UNIT (ECU)
DESCRIPTION
The ECU (Electronic Control Unit) is factory programmed
and requires no adjustment. No adjustments in the field can
be made to the programming other than engine speed for 50
or 60 hertz operation. The ECU controls starting, engine
operation, safety shutdown features and stopping the engine.
The 1 0 pin communications port is used by the factory to
input the operating program into the ECU. This connection
can be used with available Diagnostic Software Kit #055410
to monitor the operation of the Low CO system and also
with the same software to troubleshoot operating faults and
change engine operating speed for 50 or 60 hertz operation ..
The ECU is normally programmed for 60 hertz operation
unless specified otherwise. If it is necessary to change the
hertz setting of the ECU, the available software has to be
used to change this program setting in the ECU.It can not be
done any other way. ·
Setting/Changing Engine Speed
The engine speed can be set for generator operation at either
60Hz (1800 rpm) or 50Hz (1500 rpm). Once the AC voltage
output fo! the generator has been reconfigured as described
in the BC Generator section of this manual, proceed as
follows:
1. Open the control box on the generator. Shut OFF the DC
breaker on the control.
2. Access the opening on the ECU by removing the plug.
Connect your laptop (with the software installed) using
the communications cable included in the kit to the ECU
and tum the laptop ON.
NOTE:
The arrow on the communications cable
connecting plug for the ECU must face the harness
connections for the ECU.
3. Tum the DC breaker to the ON position. ·
4. Using the ECll software, start communications. Follow
the HELP menu instructions for HELP US using the
PC Interface. Program the ECU for the hertz that the
generator is being converted to.
NOTE:
The PC lnteiface can be left conected to confirm
proper rpm during testing. Always stop the generator
and turn OFF the DC breaker before disconnecting the
communications cable from the ECU.
5. Start the generator and monitor the AC output voltage.
Adjust the voltage as needed using the voltage adjustment
pod on the voltage regulator.
6. With the speed/hertz verified and the AC output voltage
adjusted, close the AC breaker and load test the generator.
CONTROL BOX
ELECTRONIC CONTROL UNIT
(ECU)
52
REPLACING THE ECU
Remove the control box cover. Before attempting to remove
the ECU, disconnect its power by removing the fuse from
the front of the
contr~l
panel. With the engine harness
connections unplugged, unscrew the four side screws and
remove the ECU from itS holder.
INSTALLING THE NEW· ECU
To install the new ECU, reverse the above procedure.