RT-SVP04F-EN 131
System Testing & Troubleshooting
GBAS 0-5VDC Module
Communications Failure
Problem: The RTM has lost
communications with the
GBAS Module.
Check: Check field/unit wiring
between RTM and GBAS.
The RTM has lost
communications with the
GBAS Module.
The UCM will initiate the
following actions;
a. If the Demand Limit input
was closed prior to the
communications loss, then the
Demand Limit commands
issued to the Heat Operation
function (if applicable) and the
Compressor Staging/Chilled
Water Cooling function will be
cancelled.
b. If any of the GBAS
SETPOINT control parameters
are the HI-selected SETPOINT
sources, then those
SETPOINTS will revert to the
default HI SETPOINTs.
c. Any active GBAS output
control parameters will be
ignored.
d. A fail safe function in the
GBAS module will cause all
GBAS outputs to be zeroed
and de-energized.
(PAR) An automatic reset
occurs after communication
has been restored.
GBAS 0-10 VDC Module
Communications Failure
Problem: RTM lost
communications with GBAS 0-
10 VDC module.
Check wiring from GBAS 0-10
VDC module to RTM.
RTM lost communication with
GBAS 0-10VDC module for 60
seconds.
If Demand Limit input was
closed previous to the
communications loss, then the
Demand Limit commands
issued to the Heat Operation
function (If applicable) and the
Compressor Staging function
will be canceled. If any of the
GBAS 0-10 vdc SETPOINT
Control Parameters are the HI-
selected SETPOINT source,
then those SETPOINTs will
revert to the default HI
SETPOINTs. Any active GBAS
0-10 vdc Output Control
Parameters will be ignored. A
fail-safe function in the GBAS
0-10vdc module will cause all
GBAS 0-10vdc outputs to be
zeroed and de-energized.
(PAR) An automatic reset
occurs after one complete set
of the required IPC packets
has been received.
Heat Failure
Problem: The Heat has Failed.
(Gas or Electric heat unit)
Typically, this is because the
gas heater's ignitor failed to
light the gas, or because the
electric heat section became
too hot.
The Heat Fail input on the
Heat module was closed:
a. for more than 80 seconds,
b. for 10 consecutive
occurrences (each lasting 5
seconds or more) within a 210
second period.‘
An Information Only
diagnostic is set.
(INFO) An automatic reset
occurs after the Heat Fail input
remains open for 210 seconds
continuously.
DIAGNOSTIC DISPLAYED REASON FOR DIAGNOSTIC UCM’S REACTION RESET REQUIRED
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