York OPTIVIEW Operation Manual page 129

FORM 160.78-O2
ISSUE DATE: 5/22/2017
TABLE 9 - SAFETY SHUTDOWN MESSAGES (CONT'D)
MESSAGE
MBC – HIGH DC/DC
TEMPERATURE
MBC – NO LEVITATION
MBC – OSCILLATOR FAULT
MBC – OVERSPEED FAULT
MBC – POWER SUPPLY FAULT
MBC – ROTOR ELONGATION
MBC – SPEED SIGNAL FAULT
JOHNSON CONTROLS
This Safety Shutdown is set when the MBC DC/DC Converter board temperature ex-
ceeds 203ºF or 95ºC for 2 seconds continuous. The MBC ESD Fault contacts open.
The MBC remains in Levitation mode with the motor shaft levitated until the VSD rota-
tion signal indicates is less than 10 Hz. Then the MBC de-levitates the rotor. The shut-
down is released when the DC/DC converter temperature drops 5.4 ºF (3 ºC) below the
trip value. The chiller can be started when the condition is released and the OptiView
panel CLEAR FAULTS key is pressed.
This Safety Shutdown is set when OptiView software is commanding MBC Levitation
Mode ON but the Rotation Allowed digital input from the MBC contacts is not reading
high. This fault is inhibited if no VSD DC Bus Voltage is present and during the first 15
seconds after the Levitation Mode ON command is sent. 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.
This Safety Shutdown is set when the MBC has determined either the radial or axial
position sensor internal Oscillator, which drives the position sensor coils, is overloaded
for 1 second continuous. This is a result of an open or short in the connection to the
shaft position sensors or a failure on the board. LED V1 or V2 illuminated on the oscil-
lator board indicates a failure with radial position or elongation channels. LED V3 or V4
illuminated on the oscillator board indicates a failure with the axial position. The MBC
ESD Fault contacts open. This 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.
This Safety Shutdown is set when the MBC determines the rotor speed exceeds the
programmed setpoint of 458 Hz for 0.1 seconds continuous. Rotor speed is transmitted
to the MBC from the VSD. The MBC ESD Fault contacts open. The MBC remains in
Levitation mode with the motor shaft levitated until commanded to de-levitate over serial
comms or VSD DC buss power depletes. 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.
This Safety Shutdown is set when the MBC detects overload on the Wide Input Range
power supply board or indicates abnormal voltage at the DC/DC converter. The Wide
Input Range power supply board overload is detected by monitoring temperature at the
transformer. The MBC ESD Fault contacts open. The MBC remains in Levitation mode
with the motor shaft levitated until commanded to de-levitate over serial comms or VSD
DC buss power depletes. This shutdown is released when voltage is restored. The
chiller can be started when the condition is released and the OptiView panel CLEAR
FAULTS key is pressed.
This Safety Shutdown is set when the MBC has calculated the algebraic difference
between the displacement at shaft impeller end axial position sensor and the shaft
opposite-impeller end axial position sensor is greater than the value calculated by linear
interpolation between 300 µm at 436 Hz to 350 µm at zero Hz. The MBC ESD Fault
contacts open. The MBC remains in Levitation mode with the motor shaft levitated until
commanded to de-levitate over serial comms or VSD DC buss power depletes. This
shutdown is released when the difference in displacements no longer exceeds these
values. The chiller can be started when the condition is released and the Optiview panel
CLEAR FAULTS key is pressed.
This Safety Shutdown is set when the MBC has the speed signal cycling fault three
times in a 90-minute window. The window is started when not currently in a window and
a MBC Speed Signal cycling fault is received. The MBC ESD Fault contacts open. The
MBC remains in Levitation mode with the motor shaft levitated until commanded to de-
levitate over serial comms or VSD DC buss power depletes. This shutdown is released
when the transmission is reestablished. The chiller can be started when the condition is
released and the OptiView panel CLEAR FAULTS key is pressed.
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
DESCRIPTION
2
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