York YK-EP, Operation And Maintenance Manual

Page: 196 / 268

Warning – Motor – High Bearing Vibration
Either the Shaft End or Opposite Shaft End motor bearing vibration has exceeded the value
programmed for the High Vibration Warning Setpoint for the programmed number of Delay
seconds. The warning will automatically clear when both vibration values decrease below the
warning threshold. This warning 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.
Routine shutdown messages
Remote Stop
A shutdown command has been received from a remote device. Remote stop commands can be
received in Digital Remote mode via I/O Board TB4-7/8 or in ISN (BAS) Remote mode via the SC-
EQ communication card serial communications. If the chiller is running when this occurs, the Pre-
Rotation Vanes are driven fully closed prior to shutting down the chiller.
Local Stop
A local shutdown command has been received by pressing the Soft Stop Key on the Home screen.
Place Compressor Switch In Run Position
The Control Center is in either Digital or ISN (BAS) Remote mode. The Operator is requested to
press the Start Key on the Home Screen. As a safety measure the Control Center will not accept a
Remote start/stop command unless the Start key is initially pressed.
Cycling shutdown messages
Multiunit Cycling – Contacts Open
The Multiunit Cycling contacts connected to I/O Board TB4-9, have opened to initiate a cycling
shutdown. If the chiller is running when this occurs, the Pre-Rotation Vanes are driven fully closed
prior to shutting down the chiller. The chiller will automatically restart when the contacts close.
System Cycling – Contacts Open
The System Cycling contacts connected to I/O Board TB4-13, have opened to initiate a cycling
shutdown. If the chiller is running when this occurs, the Pre-Rotation Vanes are driven fully closed
prior to shutting down the chiller. The chiller will automatically restart when the contacts close.
Oil – Low Temperature Differential
The chiller is prevented from starting because for one of the following reasons. The chiller will
automatically restart when the conditions have been satisfied. This condition is only checked while
the chiller is stopped. In previous software versions, it is checked when stopped and during the first
10 seconds of prelube.
The chiller has been shut down for less than or equal to 30 minutes and the oil temperature minus
the condenser saturation temperature is less than 30°F.
-OR-
The chiller has been shut down for greater than 30 minutes and the oil temperature minus the
condenser saturation temperature is less than 40°F.
-OR-
Following a power failure, upon restoration of power, the oil temperature minus the condenser
saturation temperature is less than 40°F.
YK-EP Style B Centrifugal Chiller 196