York YMC2 User Manual

JOHNSON CONTROLS
91
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
3
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 tempera-
ture or increased greater than 1.50 (ADMIN programmable) when the drop leg refriger-
ant temperature is at least 0.5 °F 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 mes-
sage press WARNING RESET key on 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 posi-
tion 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 WARN-
ING RESET key 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 posi-
tion 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 WARN-
ING 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 re-
set 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 amplier (power) board due to processor prob-
lem, 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 sys-
tem. 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 rst 15
seconds after the Rotation Mode is commanded ON. This warning is released when
Rotation Mode status matches the microboard command to the MBC.
WARNING – MOTOR – HIGH
CURRENT LIMIT
The chiller motor current is greater than or equal to the Motor Overload current limit.
The Motor Overload current limit is predetermined from the motor model and Maximum
VSD Output Current. While this condition is in effect, chiller capacity control is in over-
ride to reduce current. Normal LCHLT capacity control operation is resumed and this
message automatically clears when the motor current decreases below this limit.
WARNING – MOTOR – HIGH
HOUSING TEMPERATURE
The Motor Housing Temperature is greater than or equal to 167°F (75°C). This warning
is released when Motor Housing Temperature is less than 158°F (70°C).
WARNING- MOTOR - HIGH
ROTOR TEMPERATURE
This warning occurs when the estimated rotor temperatures exceeds 230°F (110°C) for
3 continuous seconds. This warning will automatically clear when all winding tempera-
tures decrease below the warning threshold
WARNING - MOTOR – HIGH
WINDING TEMPERATURE
This warning occurs when any of the enabled motor winding temperatures exceeds
275°F (135°C) for 3 continuous seconds. This warning will automatically clear when all
winding temperatures decrease below the warning threshold. Also it will not act on any
individual winding temperature sensor that has been disabled with the TEMPERATURE
DISABLED Setpoint on the Motor Details Screen.
WARNING – REAL TIME
CLOCK FAILURE
During the initialization process that occurs when power is applied to the control center,
test data is written to a location in the BRAM battery backed memory device (IC loca-
tion U52 on Microboard). This data is then read from the BRAM and compared to the
test data. If the read data is not the same as that which was written to the device, it is
assumed the BRAM and Real time Clock operation is defective and this message is dis-
played. The BRAM should be replaced by a qualied Service Technician. This message
automatically clears when the BRAM problem has been solved.
TABLE 9 - WARNING MESSAGES

York YMC2 Specifications

General

Brand	York
Model	YMC2
Category	Chiller
Language	English