94 Section 5 Decision-Makerr 550 Controller TP-6356 4/12
b. Scroll down to the TEMP SENSOR display.
c. Select temperature sensor part number that
matches installed temperature sensor using the
right arrow key. See Figure 5-10 for additional
identification information. When correct display
is shown, press YES and ENTER.
Note: For coolant temperature s ensors
GM31045-1 or GM31045-2, choose the
GM31045X display.
d. Installation is complete. Place the controller
master switch in the OFF/RESET position.
e. Temporarily disconnect power to the controller
by removing the F2 fuse located on the
interconnection circuit board for 10 seconds
and then replace the fuse.
Note: The generator set controller must have
the power supply disconnected and then
reconnected before the microprocessor
will accept the change.
f. At the next scheduled generator set exercise
period or at this time, start the generator set by
placing the generator set master switch in the
RUN position.
Verify that the engine water temperature
reading is valid and no water temperature
warning/shutdown faults occur. Refer to the
generator set operation manual and engine
operation manual for operation information and
temperature values.
When testing is complete, stop the generator
set by placing the controller master switch in
the OFF/RESET position.
5.5 Controller Circuit Board
Failures
(Units Using RS-232 Communications)
Adapted from Service Bulletin SB-640.
The generator set manufacturer has received reports of
controller failures using the RS-232 communication port
in some types of installations. The incidents reported
occurred where the generator set is installed outdoors
and the RS-232 connects to a remote communication
device. The controller failure may be linked to areas
experiencing frequent lightning strikes.
If controller circuit board replacement is needed, verify if
the unit has some type of external communication using
the RS-232 port. If RS-232 communication is used,
verify physical damage to circuit board components,
particularly integrated circuits U28, U55, and U58. See
Figure 5-13.
b-361590-D/GM10193A-R
34
1. Main logic (microprocessor/communication) circuit board
2. Controller top view
3. U58 integrated circuit
4. U55 integrated circuit
5. U28 integrated circuit
5
1
2
Figure 5-13 Main Circuit Board
If circuit board damage to the integrated circuit is
present, the failure was likely caused by some type of
electrical voltage surge such as a lightning strike.
The generator set manufacturer has developed an
RS-232 Isolation Kit (part number GM32967-KP) to help
reduce the likelihood of voltage surge damage. The kit
contains optical isolator GM32968 and a 152 mm (6 in.)
connection cable GM32969. Install the isolation kit if the
RS-232 port is used in conjunction with a remote
communication device.
Technicians encountering installations using RS-232
communications should consider using RS-232
isolation kit. This kit when installed will reduce the
likelihood of controller circuit board failure caused by
voltage surges.
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