Unit Is In Emergency Stop; Illegal Configuration Alarm; Loss Of Communication With The Aux Board; 4 To 20 Ma Reset Input Failure - Carrier AquaSnap 30MPA Series Controls, Start-Up, Operation, Service, And Troubleshooting

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LEGEND
Suction Pressure (psig)
Extrapolated Suction Pressure (psig)
Upper Limit for Proof of Proper Rotation (psig)
Fig. 46 — Reverse Rotation Detection (psig)
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LEGEND
Suction Pressure (psig)
Extrapolated Suction Pressure (psig)
Upper Limit for Proof of Proper Rotation (psig)
Fig. 47 — Reverse Rotation Detection (kPa)
A150 (Unit is in Emergency Stop) — If the CCN emergency
stop command is received, the alarm is generated and the unit
will be immediately stopped.
If the CCN point name EMSTOP in the system table is set
to emergency stop, the unit will shut down immediately and
broadcast an alarm back to the CCN, indicating that the unit is
down. This alarm will clear when the variable is set back to
"enable."
-1 0 1 2 3 4
Time (sec)
-1 0 1 2 3 4
Time (sec)
A151 — Illegal Configuration Alarm
Criteria for Trip: This alarm is indicated when an illegal con-
figuration has been entered.
configuration alarms. When expanding the alarm, the control
will indicate which configuration is incorrect. For example, if
the wrong size is configured, the A151 expansion will indicate
"ILLEGAL CONFIG - INVALID UNIT SIZE."
Action To Be Taken: The unit is not allowed to start.
Reset Method: Automatic, once the illegal configuration is cor-
rected.
• Possible Causes: If this condition is encountered, check the
items shown in Table 55 based on the illegal configuration.
A152 (Unit Down Due to Failure) — Reset is automatic
when all alarms are cleared. This alarm indicates the unit is at
0% capacity.
T153 (Real Time Clock Hardware Failure) — A problem
has been detected with MBB real time clock hardware. Try re-
setting the power and check the indicator lights. If the alert con-
tinues, the board should be replaced.
A154 (Serial EEPROM Hardware Failure) — A problem
has been detected with the EEPROM on the MBB. Try
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resetting the power and check the indicator lights. If the alarm
continues, the board should be replaced.
T155 (Serial EEPROM Storage Failure Error) — A problem
has been detected with the EEPROM storage on the MBB. Try
resetting the power and check the indicator lights. If the alert
continues, the board should be replaced.
A156 (Critical Serial EEPROM Storage Failure Error) — A
problem has been detected with the EEPROM storage on the
MBB. Try resetting the power and check the indicator lights. If
the alarm continues, the board should be replaced.
A157 (A/D Hardware Failure) — A problem has been detect-
ed with A/D conversion on the boards. Try resetting the power
and check the indicator lights. If the alarm continues, the board
should be replaced.
A172 (Loss of Communication with the EXV Board)
This alarm indicates that there are communication problems
with the EXV board. The alarm will automatically reset.
T173 (Energy Management Module Communication Fail-
ure) — This alert indicates that there are communication prob-
lems with the energy management module. All functions per-
formed by the EMM will stop, which can include demand lim-
it, reset and capacity input. The alert will automatically reset.
T174 (4 to 20 mA Cooling Set point Input Failure) — This
alert indicates a problem has been detected with cooling set
point 4 to 20 mA input. The input value is either less than 2 mA
or greater than 22 mA.
A175 (Loss of Communication with the AUX Board)
This alarm will be generated when the Main Base Board
(MBB) loses communication with the AUX Board. The digital
control option will be disabled while this alert is active. The
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chiller continues to run without Digital Compressor Control.
The alert will reset automatically if communication is re-estab-
lished or the unit configuration for digital control, A1.TY Com-
pressor A1 Digital? (Configuration Mode
If this condition is encountered, check the following items:
• Check for a wiring error.
• Check for a faulty communication bus, or no connection
to the AUX Board.
• Check the AUX Board.
• If the unit is configured for digital control, A1.TY Com-
pressor A1 Digital? (Configuration Mode
YES, but the unit is not a Digital Capacity machine, (no
digital compressor or AUX Board), this alarm will be
generated.
T176 (4 to 20 mA Reset Input Failure) — This alert indi-
cates a problem has been detected with reset 4 to 20 mA input.
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There are several different
—
—
UNIT) = NO.
→
UNIT) is
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