Johnson Controls YORK YVAM 0350, Operation & Maintenance Manual

Page: 92 / 162

Table 89: Warning messages
Message Description
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.
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 override 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 temperatures
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 location
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 displayed. The BRAM
should be replaced by a qualified service technician. This message automatically clears
when the BRAM problem has been solved.
WARNING – SETPOINT
OVERRIDE
A blank BRAM battery-backed memory device (IC location U52 on Microboard) or a failure
of this device was detected during the initialization process that occurs when power is
applied to the control center. Due to this failure, any or all of the programmed Setpoints
could have been corrupted. Therefore, all Setpoints have been automatically changed to
their Default values. All Setpoints will have to be programmed to their desired values. This
message will clear when the WARNING RESET button is pressed in OPERATOR (or higher)
access mode.
WARNING – UPS – BATTERY
NOT CONNECTED
This is an auto reset warning. The minimum and maximum Battery Voltage that occurs
within each 10 second window is stored. At the end of each 10 second window, if the
difference between the min and max battery voltage is greater than 0.5 V, a counter is
increased. If the difference between them is less than 0.5 V, the counter is reset to 0.
This warning is set when the Battery Disconnected Counter >= 4 (The intent is for 4
consecutive 10 second windows to see battery voltage fluctuations to set this fault)
It is released when the Battery Disconnected Counter is 0 for 60 continuous seconds.
WARNING – UPS – CHECK
BATTERY CONNECTION
This manual reset warning is set when Battery Voltage > 16.0 V. It indicates only that the
UPS output is connected to the battery leads. It is released when Battery Voltage < 16.0 V.
YVAM Control Center 92