Carrier PIC 5+ - Page 39

39
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Alm-266 ALM-266 Protective Limit - IOB
Low Voltage
Automatic As above Check IOB 24VAC power supply and the transformer output voltage
Alm-267 ALM-267 Protective Limit -
Guide Vane 1 Fault
Manual As above 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 ALM-268 Protective Limit -
Damper Valve Fault
Manual As above Check damper valve wirings
Alm-269 ALM-269 Protective Limit -
Envelope Control Valve Fault
Manual As above Check Envelope Control valve wirings
Alm-270 ALM-270 Protective Limit - High
Cond Water Flow
Manual As above Check condenser water pressure sensor and wirings
Alm-271 ALM-271 Protective Limit -
Emergency Stop
Automatic As above Check EMSTOP command form network and the remote stop dry
contact from IOB
Alm-272 ALM-272 Protective Limit - ISM
Cong Conict
Automatic As above Conguration data in controller and ISM are mismatch.
In maintains menu, choose “maintains ISM cong” ->“Delete ISM
cong”
NO – upload ISM conguration data to HMI
YES– download ISM conguration to ISM
Alm-273 ALM-273 Protective Limit - Swift
Restarts Limit Exceeded
Manual As above Check the reason why swift restart happens so frequently.
Alm-274 ALM-274 Protective Limit –
Chiller Lockout
Automatic As above Check chiller lockout input in IOB
Alm-275 ALM-275 Protective Limit – Fire
Alarm
Automatic As above Check re alarm input in IOB
Alm-276 ALM-276 Protective Limit –Stop
Override
Manual As above Check stop override point status in GENUNIT table
Alm-277 Protective Limit - UI Freeze
Reboot
Manual Same as above Power on reset PIC 5+ controller
Alm-278 Protective Limit - VFD Cong
Conict
Manual Same as above Reset shall be automatic when the communication comes back to
normal
Alm-279 Protective Limit - VFD Cong
Failure
Manual Same as above Check VFD Congurations and save it again
Alm-280 ALM-282 Protective Limit – High
VFD Speed
Manual As above Check VFD actual speed
Alm-282 ALM-282 Protective Limit -
Displacement Switch
Manual As above Check impeller displacement switch for NGC chiller
Alm-283 ALM-283 Protective Limit - High
Pressure Switch
Manual As above Check high pressure switch for NGC chiller
Alm-284 ALM-284 Protective Limit -
Power Feedback Loss
Manual As above Check Power Feedback Input
Alm-285 ALM-285 Protective Limit - Low
Bearing Delta Pres Dierence
Manual As above
Check if the lter of refrigerant pump inlet is clogged. If clogged, please
replace that lter.
Check if refrigerant pump works. If pump fails, please replace refrigerant
pump.
Check if high oat chamber has liquid. If no liquid, please wait until chiller
automatically charge refrigerant into high oat chamber.
Check if bearing lter is clogged. If clogged, please replace bearing lter
Alm-286 Protective Limit - Low Liquid
Level in High Float VLV
Manual Same as above Reset shall be manual
Alm-290 ALM-290 Protective Limit –
Long Time Purge Active
Manual As above Check if there’s large leak on chiller.
Check if purge vacuum pump fails. If it fails, please replace this vacuum
pump.
Alm-291 ALM-291 Protective Limit –
Drainage System Failure
Manual As above Check if purge drain lter is clogged. If clogged, please replace that
lter.
Check if refrigerant pump can’t work. If refrigerant pump fails, please
replace this pump
Alm-292 ALM-292 Protective Limit -
Guide Vane 2 Fault
Manual As above 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 4-20mA current
Alm-293 ALM-293 Protective Limit - Low
Ref Pump Pressure Dierence
Manual As above Check refrigerant pump
Check refrigerant pump wiring
Alm-294 ALM-294 Protective Limit - High
Ref Filter Pressure Dierence
Manual As above Check refrigerant lter
Check refrigerant lter wiring
Alm-295 ALM-295 Protective Limit - High
Bearing Refrig Supply Temp
Manual As above Check bearing refrig supply temperature sensor
Alm-296 ALM-296 Protective Limit - High
Evaporator Pressure
Manual As above Check evaporator pressure sensor input
And check evaporator pressure cutout congurations
Alm-298
ALM-297 Protective Limit - Low
Bearing Refrig Supply Subcooling
Manual As above Check bearing inlet pressure sensor input
And check bearing ref supply temperature sensor