35
ALM-264
Protective Limit -
Diffuser Position
Fault
Manual
Unit shuts down.
Alarm relay turns on.
Confirm that Diffuser Option in SRD Configuration screen has not been
Enabled if compressor does not have a split ring diffuser. May indicate
rotating stall condition.
Check rotating stall transducer wiring accuracy and sealing.
Check diffuser schedule and guide vane schedule in SRD Configuration
screen.
Check for proper operation of diffuser and inlet guide vane actuators
including inlet guide vane calibration.
Check diffuser actuator coupling for rotational slip.
Check for electrical noise in IOB Diffuser Pressure wiring. Do not
continue to operate compressor except for diagnostic purposes.
ALM-265
Protective Limit -
Refrigerant Leak Manual
Unit shuts down.
Alarm relay turns on.
REFRIGERANT LEAK OPTION is Enabled and the REFRIGERANT
LEAK SENSOR output exceeded REFRIGERANT LEAK ALARM mA.
Check for refrigerant leaks. Check leak detector for proper operation.
Check REFRIGERANT LEAK ALARM mA setting in the OPTIONS
screen. Check 4-20 mA or 1-5 V output from refrigerant leak sensor to
IOB J15-5Confirm that IOB SW2 dip switch 1 is in the correct position.
ALM-266
Protective Limit -
IOB Low Voltage Automatic
Unit shuts down.
Alarm relay turns on. Check IOB 24VAC power supply and the transformer output voltage
ALM-267
Protective Limit -
Guide Vane 1
Fault
Manual
Unit shuts down.
Alarm relay turns on.
Alarm before start indicates guide vane opening has not closed to less
than 4%. Alarm while running indicates guide vane position is < -1% or >
103%. Enter Quick Calibration and conduct Guide Vane Calibration.
Check wiring between the guide vane feedback potentiometer and IOB
terminals. Check the ohm guide vane position feedback potentiometer
or 4-20mA current
ALM-268
Protective Limit -
Damper Valve
Fault
Manual
Unit shuts down.
Alarm relay turns on. Check damper valve wirings
ALM-269
Protective Limit -
Envelope Control
Valve Fault
Manual
Unit shuts down.
Alarm relay turns on. Check Envelope Control valve wirings
ALM-270
Protective Limit -
High Cond Water
Flow
Manual
Unit shuts down.
Alarm relay turns on. Check condenser water pressure sensor and wirings
ALM-271
Protective Limit -
Emergency Stop Automatic
Unit shuts down.
Alarm relay turns on.
Check EMSTOP command form network and the remote stop dry
contact from IOB
ALM-272
Protective Limit -
ISM Config
Conflict
Automatic
Unit shuts down.
Alarm relay turns on.
Configuration data in controller and ISM are mismatch.
In maintains menu, choose “maintains ISM config” ->“Delete ISM
config”
NO – upload ISM configuration data to HMI
YES– download ISM configuration to ISM
ALM-273
Protective Limit -
Swift Restarts
Limit Exceeded
Manual
Unit shuts down.
Alarm relay turns on. Check the reason why swift restart happens so frequently.
ALM-274
Protective Limit –
Chiller Lockout
Automatic
Unit shuts down.
Alarm relay turns on. Check chiller lockout input in IOB
ALM-275
Protective Limit –
Fire Alarm
Automatic
Unit shuts down.
Alarm relay turns on. Check fire alarm input in IOB
ALM-276
Protective Limit –
Stop Override
Manual
Unit shuts down.
Alarm relay turns on. Check stop override point status in GENUNIT table
ALM-277
Protective Limit -
UI Freeze Reboot Manual
Unit shuts down.
Alarm relay turns on. Power on reset Carrier SmartView
TM
controller
ALM-278
Protective Limit -
VFD Config
Conflict
Manual
Unit shuts down.
Alarm relay turns on. Reset shall be automatic when communication comes back to normal
ALM-279
Protective Limit -
VFD Config
Failure
Manual
Unit shuts down.
Alarm relay turns on. Check VFD Configurations and save it again
ALM-280
Protective Limit –
High VFD Speed Manual
Unit shuts down.
Alarm relay turns on. Check VFD actual speed
ALM-282
Protective Limit -
Displacement
Switch
Manual
Unit shuts down.
Alarm relay turns on. Check impeller displacement switch for NGC chiller
ALM-283
Protective Limit -
High Pressure
Switch
Manual
Unit shuts down.
Alarm relay turns on. Check high pressure switch for NGC chiller
ALM-284
Protective Limit -
Power Feedback
Loss
Manual
Unit shuts down.
Alarm relay turns on. Check Power Feedback Input
ALM-285
Protective Limit -
Low Bearing
Delta Pres
Difference
Manual
Unit shuts down.
Alarm relay turns on.
Alarm active if Bearing Delta P is less than 8 psi for 8s during Pre-lube/
Startup OR
When compressor is running the Bearing Delta P is less than 10 psig for
30s
Table 16 — PIC6 Alarm Codes* (cont)
ALARM CODE
DESCRIPTION
OF ALARM TEXT
RESET TYPE
ACTION TAKEN BY
THE CONTROL
POSSIBLE CAUSE