York YK Style H Operation Manual page 190

this setting, if the Shutdown Setpoint is enabled, this safety shutdown will occur. If shutdown is
disabled, this warning message will be displayed but the safety shutdown will not be performed.
Motor – High Winding Temperature
This safety shutdown occurs when either of the following conditions are present:
• Any of the enabled Motor Winding Temperatures exceeded the programmed High Winding
Temperature Shutdown threshold plus the programmed Winding Hotspot Allowance
threshold for 3 continuous seconds.
-OR-
• The Average Winding Temperature has exceeded the programmed High Winding
Temperature Shutdown threshold for 3 continuous seconds.
The values programmed for the above safety thresholds are displayed as High Winding
Temperature Shutdown and Winding Hotspot Allowance on the MOTOR SETPOINTS Screen. They
are programmed with the Winding Setup Setpoint on that screen. The chiller can be started after
all winding temperatures decrease to at least 18°F (10°C) below the shutdown threshold and the
Clear Fault key is pressed on the display. This safety shutdown will not occur when the Winding
Temperature Protection Setpoint is set to Disabled on the MOTOR DETAILS Screen. Also, it will not
act on any RTD input registering as an open RTD or any individual winding temperature sensor that
has been disabled with the Temperature Disable Setpoint on the MOTOR SETPOINTS Screen.
Motor – High Bearing Temperature
This safety shutdown occurs when either of the enabled motor bearing temperatures exceeds the
programmed High Bearing Temperature Shutdown threshold for 3 continuous seconds. The value
programmed for this safety threshold is displayed as High Bearing Temperature Shutdown on the
MOTOR SETPOINTS Screen. It is programmed with the Bearing Setup Setpoint on that screen. The
chiller can be started after both bearing temperatures decrease to at least 9°F below the shutdown
threshold and the Clear Fault key is pressed on the display. This safety shutdown will not occur
when the Bearing Temperature Protection Setpoint is set to Disabled on the MOTOR DETAILS
Screen. Also, it will not act on any RTD input registering as an open RTD.
Motor – High Bearing Vibration
Either the Shaft End or Opposite Shaft End motor bearing vibration has exceeded the value
programmed for the High Vibration Shutdown Setpoint for the programmed number of delay
seconds. This safety shutdown does not occur when the Motor Vibration Protection Setpoint is set
to Disabled on the MOTOR DETAILS Screen or while the WARNING – MOTOR – BEARING VIBRATION
BASELINE NOT SET warning is displayed. The chiller can be started after the both vibration values
decrease below the shutdown threshold and the Clear Fault key is pressed on the display.
Motor – Cooling Coil Leak
The Motor Cooling Coil Leak Detector has registered a fault condition for at least 3 continuous
seconds. The Motor Cooling Coil leak Protection Setpoint enables the type of sensor employed: If
an optical sensor is being used, the input to the Motor Monitoring Board goes high to indicate a
leak; if a float switch is used, the input goes low to indicate a leak. This safety shutdown will not
occur when the Motor Cooling Coil Leak Protection Setpoint is set to Disabled. The chiller can be
started after the leak sensor no longer indicates a leak and the Clear Fault key is pressed on the
display.
190 Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center