Table 92: Safety shutdown messages
Message Description
MBC – AMP
COMMUNICATION
This Safety Shutdown is set when the MBC control board detects a
communication error between the control and amplifier boards of the MBC.
The MBC Fault contacts open. The MBC remains in Levitation mode with the
motor shaft levitated until commanded to de-levitate over serial comms. This
shutdown is released when the board-level communication failure is resolved.
The chiller can be started when the condition is released and the OptiView panel
CLEAR FAULTS key is pressed.
MBC – AMP
WATCHDOG
This Safety Shutdown is set when the MBC determines a lapse in internal
microprocessor activity on the Amplifier Board through its Watchdog device.
The MBC Fault contacts open. The MBC will not react to a levitation mode
change command via serial comms. The MBC remains in the levitation mode it
was in when the fault occurred until power is removed. Power must be removed
from the UPS to the MBC. The chiller can be started when the condition is
released and the OptiView panel CLEAR FAULTS key is pressed.
MBC – DSP
WATCHDOG
This Safety Shutdown is set when the MBC determines a lapse in internal
microprocessor activity on the Control Board through its Watchdog device. The
MBC Fault contacts open. The MBC will not react to a levitation mode change
command via serial comms. The MBC remains in the levitation mode it was in
when the fault occurred until power is removed. Power must be removed from
the UPS to the MBC. The chiller can be started when the condition is released
and the OptiView panel CLEAR FAULTS key is pressed.
MBC –
EXCESSIVE
SHUTDOWNS
This Safety Shutdown is set if 3 MBC Cycling Shutdowns occur in a 15 minute
window. It is released when the chiller is stopped. The 15 minute window begins
with the first MBC fault. The chiller can be started when the condition is released
and the OptiView
™
panel CLEAR FAULTS key is pressed.
MBC – HIGH
AMPLIFIER
TEMPERATURE
This Safety Shutdown is set when the MBC amplifier temperature exceeds
158°F (70°C) for 1 seconds continuous. The MBC Fault contacts open. The
MBC remains in Levitation mode with the motor shaft levitated until the VSD
rotation signal indicates less than 10 Hz. Then the MBC de-levitates the rotor.
The shutdown is released when amplifier temperature drops below the trip
value. Check the connection of the board to the heatsink and the response
of the temperature sensor on the board. The chiller can be started when the
condition is released and the OptiView panel CLEAR FAULTS key is pressed.
MBC – HIGH
BEARING Z1
TEMPERATURE
This Safety Shutdown is set when the MBC detects a temperature is greater
than 266ºF (130ºC) on the impeller end axial magnetic bearing. The MBC Fault
contacts open. The MBC remains in Levitation mode with the motor shaft
levitated until the VSD rotation signal indicates is less than 10 Hz. This shutdown
is released when temperature is less than 266ºF (130ºC). The chiller can be
started when the condition is released and the OptiView panel CLEAR FAULTS
key is pressed.
MBC – HIGH
BEARING Z2
TEMPERATURE
This Safety Shutdown is set when the MBC detects a temperature is greater
than 266ºF (130ºC) on the opposite-impeller end axial magnetic bearing. The
MBC Fault contacts open. The MBC remains in Levitation mode with the motor
shaft levitated until the VSD rotation signal indicates is less than 10 Hz. This
shutdown is released when temperature is less than 266ºF (130ºC). The chiller
can be started when the condition is released and the OptiView
™
panel CLEAR
FAULTS key is pressed.
129
YMC
2
Mod B with OptiView
™
Control Center
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