York YK-EP B Operation & Maintenance Manual page 179

FORM 160.87-OM1
ISSUE DATE: 8/24/2018
Thrust Bearing – Proximity Probe Out Of Range
The clearance between the compressor high speed
thrust collar and the tip of the Proximity Probe has de-
creased to less than 17 mils.
The clearance is only checked during the last 20 sec-
onds of System Prelube, during System Run and dur-
ing coastdown. Therefore, the fault is only detected
during those periods.
This shutdown must be evaluated by a
qualified Service Technician prior to start-
ing the chiller. Starting the chiller without
this evaluation could result in severe
compressor damage. To prevent the chiller
from starting without the proper evalua-
tion, 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 OptiView Control Center -
Service Instructions (Form 160.54-M1).
Thrust Bearing – Limit Switch Open
The High Speed Thrust Bearing Limit Switch contacts,
connected to TB3-81, have opened. This occurs when
the Bearing position decreases to less than the allowed
position.
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 switch contacts have closed and
a special reset procedure is performed
by the Service Technician. The evalua-
tion and reset procedure are contained
in OptiView Control Center - Service
Instructions (Form 160.54-M1).
Watchdog – Software Reboot
The Microboard's software Watchdog initiated a Mi-
croprocessor 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-ini-
tialization 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 WARNING RESET button.
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
Surge Protection – Excess Surge
(Applies only if Surge Protection Shutdown feature is
Enabled)
The Surge Window Count surge events exceeded the
Count Limit Setpoint. If the Surge Protection Extended
Run feature is Disabled, the chiller shuts down as soon
as the count exceeds the limit. If the Extended Run fea-
ture is Enabled, this shutdown occurs only if the count
exceeds the limit at completion of the 10 minute Ex-
tended Run period. The chiller can be started after the
Operator presses the WARNING RESET button.
Motor – Lack of Bearing Lubrication
The Operating Hours Since Last Motor Lubrication
has exceeded set hours. This message replaces WARN-
ING MOTOR BEARING LUBE REQUIRED above.
This safety shutdown remains in effect until the Op-
erator presses the WARNING RESET button and en-
ters his/her initials, name or user ID in OPERATOR
access level (or higher) using the MOTOR LUBE AC-
KNOWLEDGE key on the MOTOR LUBRICATION
Screen. Refer to the Motor Lubrication Screen on Page
107 for entry instructions. The date and time of this
entry is automatically logged as the Date Of Last Mo-
tor Lubrication and Time Of Last Motor Lubrication.
It also resets the Operating Hours Since Last Lubrica-
tion to zero. The date this warning occurs is stored as
the Date Of Last Motor Lubrication Warning Or Fault.
This message will only be displayed if the Auto Lube
Setpoint is disabled. With this setting, if the Shutdown
Setpoint is enabled, this safety shutdown will occur. If
shutdown is disabled, this warning message will be dis-
played but the safety shutdown will not be performed.
Motor – High Winding Temperature
This safety shutdown occurs when either of the follow-
ing conditions are present:
• Any of the enabled Motor Winding Temperatures
exceeded the programmed High Winding Temper-
ature Shutdown threshold plus the programmed
Winding Hotspot Allowance threshold for 3 con-
tinuous seconds.
-OR-
• The Average Winding Temperature has exceed-
ed the programmed High Winding Temperature
Shutdown threshold for 3 continuous seconds.
The values programmed for the above safety thresh-
olds are displayed as High Winding Temperature Shut-
down and Winding Hotspot Allowance on the MOTOR
SETPOINTS Screen. They are programmed with the
3
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