Table 97: Warning messages
Message Description
WARNING - LOSS OF
SUBCOOLER LIQUID
SEAL
The chiller is running greater than 30 minutes and the Subcooler
Effectiveness value decreased less than 0.400 (admin programmable)
at any drop leg refrigerant temperature or increased greater than 1.50
(admin programmable) when the drop leg refrigerant temperature
is at least 0.5 °F (0.27°C) below or any amount above the Entering
Condenser Liquid Temperature. The subcooler effectiveness is
(Condenser Sat Temp - Drop leg refrigerant temp)/(Cond Sat Temp
- Entering Condenser Liquid Temp). To clear the message, press the
warning reset button on the home screen when logged in at operator
(or higher) access level.
WARNING – MBC
– HIGH AXIAL
OSCILLATOR VOLTAGE
This manual reset warning is set when the internal oscillator that drives
the axial position sensor coil is overloaded for one continuous second.
This is typically the result of an open in the connection to the shaft
position sensor. It could also be a failure of the MBC control board. This
message will clear when the voltage is normal and the warning reset
button is pressed in operator (or higher) access mode.
WARNING – MBC
– HIGH RADIAL
OSCILLATOR VOLTAGE
This manual reset warning is set when the internal oscillator that drives
the radial position sensor coil is overloaded for one continuous second.
This is typically the result of an opening in the connection to the shaft
position sensor. It could also be a failure of the MBC control board. This
message will clear when the voltage is normal and the warning reset
key is pressed in operator (or higher) access mode.
WARNING – MBC –
CHECKSUM CENTERING
This warning appears when the MBC Axial Centering process was never
performed, or not correctly realized internally. The centering process as
found in the calibration section of Form 160.84-M2 will need to be done
in admin access. Then this message will clear when the warning reset
key is pressed in operator (or higher) access mode.
WARNING – MBC – DSP
WATCHDOG
A software reboot has occurred on the control board due to processor
problem, but reset with the reboot. This message will clear when the
warning reset key is pressed in operator (or higher) access mode.
WARNING – MBC – AMP
WATCHDOG
A software reboot has occurred on the amplifier (power) board due to
processor problem, but reset with the reboot. This message will clear
when the warning reset key is pressed in operator (or higher) access
mode.
WARNING – MBC –
INTERNAL ALARM
The MBC experienced an unsatisfactory condition detected internally
to the control system. This message will clear when the condition is
resolved and the warning reset key is pressed in operator (or higher)
access mode.
WARNING – MBC –
ROTATION MODE OFF
During the time the MBC Rotation Mode is commanded ON by the
microboard via serial comms this warning is set if the MBC reports
Rotation Mode is OFF by serial comms. This warning is inhibited if MBC
communication is not initiated and during the first 15 seconds after
the Rotation Mode is commanded ON. This warning is released when
Rotation Mode status matches the microboard command to the MBC.
99
YMC
2
Mod B with OptiView Control Center
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