JOHNSON CONTROLS
91
SECTION 6 - OPERATION
FORM 201.30-ICOM1 (519)
ISSUE DATE: 05/22/2019
6
FAULT MESSAGES
A number of possible fault messages may appear when
the STATUS key is pressed. Whenever a fault message
appears, the safety thresholds on the unit have been ex-
ceeded, the unit will be shut down, and, in some cases,
locked out. The shutdown thresholds and associated
information relating to each fault are explained in the
UNIT WARNINGS, UNIT SAFETIES (FAULTS) and
SYSTEM SAFETIES (FAULTS) sections.
Unit Warnings
Unit warnings, as shown in Table 31 on page 95,
are caused when a condition is present requiring opera-
tor intervention to restart the unit. Check all setpoints,
program values, and options before operating the unit.
Warnings are not logged into the history buffer. If a
unit warning is in effect, the message will be displayed
when the operator presses the STATUS key.
MICROBOARD (331-03478-XXX)
The 331-03478-xxx microboard was developed as
a direct replacement for the 031-02478-xxx line of
microboards. No adapter harness is required when re-
placing a 02478 with the new 03478. The 03478 uses
the IPUII processor card and provides some new fea-
tures for the chillers that the 02478 did not have. The
03478 program resides in flash memory instead of
EPROM. Program updates are accomplished by load-
ing the new program from an SD card inserted into
the SD card reader/writer. This same SD card reader/
writer also allows the user to datalog the operating pa-
rameters to an SD card every 5 seconds. This infor-
mation is invaluable when troubleshooting unit and
system problems since it allows the service technician
to view operating parameters prior to a unit fault. De-
tails on the new datalogging capability are explained
in the OPTIONS Key area of this manual. A Real Time
Clock/BRAM keeps time and setpoints during power
outtages.
Power Supplies and LEDs
The 03478 has LEDs to indicate various states of op-
eration of the microboard.
STATUS – Flashes every ½ second to indicate that the
base board processor is running its program.
POWER – On solid indicates that the base board +12V
and +5V power supplies are operational.
TX1 – Red LED flashes when transmitting data out
Port 1 TB3 (Future native communications BAS port)
RX1 – Green LED flashes when receiving data in Port
1 TB3 (Future native communications BAS port)
TX2 – Red LED that flashes when transmitting data
out Port 2 (E-Link TB2 or printer TB1)
RX2 – Green LED that flashes when receiving data in
Port 2 (E-Link TB2 or printer TB1)
VSD_TX – Red LED that flashes when transmitting
data out Port 3 to the VSD Logic board
VSD_RX – Green LED that flashes when receiving
data in Port 3 from the VSD Logic board
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