Table 92: Safety shutdown messages
Message Description
MBC – HIGH
INPUT VOLTAGE
Main DC supply voltage to the MBC exceeded 165VDC (150+ 10%)
MBC – NO
LEVITATION
This Safety Shutdown is set when OptiView software is commanding MBC
Levitation Mode ON but the MBC is not reporting Levitated within 15 seconds.
This fault is prohibited when the MBC Alive input is not high, indicating the MBC
unavailable. This fault is released when the chiller is stopped. The chiller can be
started when the condition is released and the OptiView
™
panel CLEAR FAULTS
key is pressed.
WARNING – MBC
– HIGH RADIAL
OSCILLATOR
VOLTAGE
This Safety Shutdown 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 open in the connection to the shaft position sensor. It could also be
a failure of the MBC control board. The MBC Fault contacts open. The shutdown
is released when the Oscillator voltage drop is normal. The chiller can be started
when the condition is released and the OptiView panel CLEAR FAULTS key is
pressed.
MBC – LOW
RADIAL
OSCILLATOR
VOLTAGE
This Safety Shutdown is set when the internal oscillator that drives the radial
position sensor coil is low for one continuous second. This is typically the result
of a short in the connection to the shaft position sensor. It could also be a
failure of the MBC control board. The MBC Fault contacts open. The shutdown is
released when the Oscillator voltage drop is normal. The chiller can be started
when the condition is released and the OptiView panel CLEAR FAULTS key is
pressed.
MBC –
HIGH AXIAL
OSCILLATOR
VOLTAGE
This Safety Shutdown 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. The MBC Fault contacts open. The shutdown
is released when the Oscillator voltage drop is normal. The chiller can be started
when the condition is released and the OptiView panel CLEAR FAULTS key is
pressed.
MBC –
LOW AXIAL
OSCILLATOR
VOLTAGE
This Safety Shutdown is set when the internal oscillator that drives the axial
position sensor coil is low for one continuous second. This is typically the result
of a short in the connection to the shaft position sensor. It could also be a
failure of the MBC control board. The MBC Fault contacts open. The shutdown is
released when the Oscillator voltage drop is normal. The chiller can be started
when the condition is released and the OptiView panel CLEAR FAULTS key is
pressed.
MBC –
OVERSPEED
FAULT
This Safety Shutdown is set when the MBC determines the rotor speed exceeds
the programmed setpoint of 360 Hz for 0.1 seconds continuous. Rotor speed is
transmitted to the MBC from the VSD. 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 speed signal
no longer exceeds the setpoint, which should occur when the chiller is stopped.
The chiller can be started when the condition is released and the OptiView panel
CLEAR FAULTS key is pressed.
YMC
2
Mod B with OptiView
™
Control Center
130
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