Table 6: Warning messages
Message Description
Warning – Motor Bearing
Lube Required
The Operating Hours Since Last Motor Lubrication has exceeded 1200 hours (the
greater of either Motor #1 Operating Hours or Motor #2 Operating Hours is used
for this calculation). This warning replaces Warning – Motor Bearing Lube Suggested
above. This warning is displayed until manually cleared by the operator or the Operating
Hours Since Last Motor Lubrication exceed 1400 hours, whereupon it is replaced
by the message Motor – Lack of Bearing Lubrication. The operator clears this
message by entering 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. This warning message will only be displayed if the Auto lube setpoint
on the Motor lubrication screen is disabled.
Possible Leak In
Compressor 1 Discharge
Valve
When compressor 2 is running in the lead and compressor 1 (lag) is either stopped or in
the last 10 seconds of system coastdown, an open discharge valve is detected on the lag
compressor by comparing the lag compressor stall transducer output to the evaporator
transducer output. If the difference is >16 psid for at least 1 second, this message is
displayed. This check is only performed if the lead compressor has been running for 5 or
more seconds, the evaporator pressure transducer is sensing a pressure that is in range (6 –
74 psig) and the stall transducer is installed and its output is > 0.5 VDC.
Possible Leak In
Compressor 2 Discharge
Valve
When compressor 1 is running in the lead and compressor 2 (lag) is either stopped or in
the last 10 seconds of system coastdown, an open discharge valve is detected on the lag
compressor by comparing the lag compressor stall transducer output to the evaporator
transducer output. If the difference is >16 psid for at least 1 second, this message is
displayed. This check is only performed if the lead compressor has been running for 5 or
more seconds, the evaporator pressure transducer is sensing a pressure that is in range (6 –
74 psig) and the stall transducer is installed and its output is > 0.5 VDC.
Routine shutdown messages
Table 7: Routine shutdown messages
Message Description
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 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 placing the Soft Stop key on the Home
screen.
Place Compressor Switch
In Run Position
The control center is in either digital or integrated systems network (ISN) remote mode. The
operator is requested to place the compressor switch in the run position. The control center
will not accept a remote start/stop command unless the switch is in the run position.
39Model YD Mod D with OptiView Control Center
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