Johnson Controls York YD Manual page 50

Table 9: Safety shutdown messages
Message
THRUST BEARING #2 –
PROXIMITY PROBE OUT OF
RANGE
THRUST BEARING #1
– PROXIMITY PROBE
UNCALIBRATED
THRUST BEARING #2
– PROXIMITY PROBE
UNCALIBRATED
WATCHDOG – SOFTWARE
REBOOT
MOTOR – LACK OF BEARING
LUBRICATION
COMPRESSOR 1 PRV NOT
FULLY CLOSED
COMPRESSOR 2 PRV NOT
FULLY CLOSED
50
Description
The chiller (both compressors) has shutdown because the clearance between compressor
#2 high speed thrust collar and the tip of the proximity Probe has decreased to <17 mils. The
chiller cannot be started until the special reset procedure is performed as referenced in the
CAUTION below.
If compressor #2 is locked out using the Lockout key on the Capacity Compressor Cycling
Screen, this fault does not cause compressor #1 to shutdown or prevent it from starting.
When this fault occurs on a locked-out compressor, it is displayed as a warning. This allows
the user to know that a fault exists on the locked-out compressor. The condition must be
corrected prior to the lockout being removed from the compressor. If it is not, the warning
condition will revert back to a shutdown as soon as the lockout is removed and will cause the
chiller to trip.
The clearance is only checked during the last 20 seconds of "System Prelube", during
"System Run" and during "Coastdown". Therefore, the fault is only detected during
those periods. Also, the +10 mil threshold must be exceeded for 2 continuous seconds
(instantaneous with previous software).
CAUTION: This shutdown must be evaluated by a qualified Service Technician
prior to starting the chiller. Starting the chiller without this evaluation could result
in severe compressor damage. To prevent the chiller from starting without the
proper evaluation, restart is inhibited until the clearance is within +10 to -25 mils of
the Reference Position and a special reset procedure is performed by the Service
Technician. The evaluation and reset procedure are contained in Service Manual (Form
160.69-M1-C).
The chiller (both compressors) is shutdown because the compressor #1 High Speed Thrust
Bearing Proximity Reference Position calibration has not been performed. The chiller can be
started after the calibration and a special reset procedure has been performed.
The chiller (both compressors) is shutdown because the compressor #2 High Speed Thrust
Bearing Proximity Reference Position calibration has not been performed. The chiller can be
started after the calibration and a special reset procedure has been performed.
The Microboard's software Watchdog initiated a Microprocessor reset because it detected
that a portion of the chiller operating Program was not being executed. The result of this
reset is a Safety shutdown and re-initialization of the Program. This is generally indicative of
a severe electrical power disturbance or impending Microboard Failure. The chiller can be
started after the Operator presses the Clear Faults button.
(Software version C.OPT.11.02.300 and later).
The Operating Hours Since Last Motor Lubrication has exceeded 1400 hours (the greater of
either Motor #1 Operating Hours or Motor #2 Operating Hours is used for this calculation).
This message replaces "Warning – Motor Bearing Lube Required" above. This safety
shutdown remains in effect until the Operator places the COMPRESSOR Switch in the Stop-
reset (O) position and enters his/her initials, name or user ID in Operator Access Level (or
higher) using the Motor Lube Acknowledge key on the Motor Lubrication Screen. See the
for entry instructions. This entry implies both motors were lubricated. The date and time of
this entry is automatically logged as the "Date of Last Motor Lubrication" and "Time of Last
Motor Lubrication". It also resets the "Operating Hours Since Last Lubrication" to zero. The
date this warning occurs is stored as the "Date of Last Motor Lubrication Warning or Fault".
If the SHUTDOWN setpoint on the Motor Lubrication Screen is disabled, this message will be
displayed as a warning but the safety shutdown will not be performed.
The chiller (both compressors) has shutdown because compressor 1 Pre-rotation vanes have
not fully closed (as indicated by the PRV end-switch) while compressor 2 was running. The
chiller can be started after the PRV end switch has closed and the Operator presses the Clear
Faults button.
The chiller (both compressors) has shutdown because compressor 2 Pre-rotation vanes have
not fully closed (as indicated by the PRV end-switch) while compressor 1 was running. The
chiller can be started after the PRV end switch has closed and the Operator presses the Clear
Faults button.
Model YD Mod D with OptiView Control Center