Diagnostics
154 RTAC-SVX01J-EN
Main Processor Diagnostics
Table 67. Main processor diagnostics
Diagnostic Name
Affects
Target Severity
Persist-
ence
Active Modes
[Inactive
Modes] Criteria
Reset
Level
BAS Communication
Lost
None Special NonLatch All
The BAS was setup as "installed" at the MP and the Comm 3 llid
lost communications with the BAS for 15 contiguous minutes
after it had been established. Refer to Section on Setpoint
Arbitration to determine how setpoints and operating modes
may be effected by the comm loss. The chiller follows the value
of the Tracer Default Run Command which can be previously
written by Tracer and stored nonvolatilely by the MP (either use
local or shutdown).
Remote
BAS Failed to
Establish
Communication
None Special NonLatch At power-up
The BAS was setup as "installed" and the BAS did not
communicate with the MP within 15 minutes after power-up.
Refer to Section on Setpoint Arbitration to determine how
setpoints and operating modes may be effected. Note: The
original requirement for this was 2 minutes, but was
implemented at 15 minutes for RTAC.
Remote
Check Clock Chiller Info Latch All
The real time clock had detected loss of its oscillator at some
time in the past. Check / replace battery? This diagnostic can
be effectively cleared only by writing a new value to the chiller's
time clock using the TechView or DynaView's "set chiller time"
functions.
Remote
Condenser Fan
Variable Speed
Drive Fault - Circuit
1 (Drive 1)
All
inverters
on this
circuit
Special
Mode
Latch
Prestart and
Running w/
Variable Spd Fan
enabled
The MP has received a fault signal from the respective condenser
fan Variable Speed Inverter Drive, and unsuccessfully
attempted (5 times within 1 minute of each other) to clear the
fault. The 4 th attempt removes power from the inverter to
create a power up reset. If the fault does not clear, the MP will
revert to constant speed operation without the use of the
inverter's fan. The inverter must be manually bypassed, and fan
outputs rebound, for full fixed speed fan operation.
Remote
Condenser Fan
Variable Speed
Drive Fault - Circuit
1 Drive 2
All
inverters
on this
circuit
Special
Mode
Latch
Prestart and
Running w/
Variable Spd Fan
enabled
The MP has received a fault signal from the respective condenser
fan Variable Speed Inverter Drive, and unsuccessfully
attempted (5 times within 1 minute of each other) to clear the
fault. The 4 th attempt removes power from the inverter to
create a power up reset. If the fault does not clear, the MP will
revert to constant speed operation without the use of the
inverter's fan. The inverter must be manually bypassed, and fan
outputs rebound, for full fixed speed fan operation.
Remote
Condenser Fan
Variable Speed
Drive Fault - Circuit
2 (Drive 1)
All
inverters
on this
circuit
Special
Mode
Latch
Prestart and
Running w/
Variable Spd Fan
enabled
The MP has received a fault signal from the respective condenser
fan Variable Speed Inverter Drive, and unsuccessfully
attempted (5 times within 1 minute of each other) to clear the
fault. The 4 th attempt removes power from the inverter to
create a power up reset. If the fault does not clear, the MP will
revert to constant speed operation without the use of the
inverter's fan. The inverter must be manually bypassed, and fan
outputs rebound, for full fixed speed fan operation.
Remote
Condenser Fan
Variable Speed
Drive Fault - Circuit
2 (Drive 2)
All
inverters
on this
circuit
Special
Mode
Latch
Prestart and
Running w/
Variable Spd Fan
enabled
The MP has received a fault signal from the respective condenser
fan Variable Speed Inverter Drive, and unsuccessfully
attempted (5 times within 1 minute of each other) to clear the
fault. The 4 th attempt removes power from the inverter to
create a power up reset. If the fault does not clear, the MP will
revert to constant speed operation without the use of the
inverter's fan. The inverter must be manually bypassed, and fan
outputs rebound, for full fixed speed fan operation.
Remote
Condenser
Refrigerant Pressure
Transducer - Circuit
1
Circuit Immediate Latch All Bad Sensor or LLID Remote
Condenser
Refrigerant Pressure
Transducer - Circuit
2
Circuit Immediate Latch All Bad Sensor or LLID Remote
Emergency Stop Chiller Immediate Latch All
a. EMERGENCY STOP input is open. An external interlock has
tripped. Time to trip from input opening to unit stop shall be 0.1
to 1.0 seconds.
Local
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