Johnson Controls YORK YVAM 0350, Operation & Maintenance Manual

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Table 91: Cycling shutdown messages
Message Description
MBC – V24 LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 90 µm (90 micron) from center
in the orthogonal radial axis designated V at the opposite-impeller end radial magnetic
bearing during Levitation or Rotation mode over a 7 second window (approximately 2/3
of the air gap space to the touchdown bearing). 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 warning is released when displacement is less than 90 µm (90
micron).
MBC – V24 POSITION
The MBC has measured shaft displacement is greater than 100 µm (100 micron) from
center in the orthogonal radial axis designated V at the opposite-impeller end radial
magnetic bearing during Levitation or Rotation mode (approximately 2/3 of the air gap
space to the touchdown bearing). 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 displacement is less than 100 µm (100 micron).
MBC – W13 LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 90 µm (90 micron) from center
in the orthogonal radial axis designated W at the impeller end radial magnetic bearing
during Levitation or Rotation mode over a 7 second window (approximately 2/3 of the air
gap space to the touchdown bearing). 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 warning is released when displacement is less than 90 µm (90 micron).
MBC – W13 POSITION
The MBC has measured shaft displacement is greater than 100 µm (100 micron) from
center in the orthogonal radial axis designated W at the impeller end radial magnetic
bearing during Levitation or Rotation mode (approximately 2/3 of the air gap space to the
touchdown bearing). 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 displacement is less than 100 µm (100 micron).
MBC – W24 LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 90 µm (90 micron) from center
in the orthogonal radial axis designated W at the opposite-impeller end radial magnetic
bearing during Levitation or Rotation mode over a 7 second window (approximately 2/3
of the air gap space to the touchdown bearing). 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 warning is released when displacement is less than 90 µm (90
micron).
MBC – W24 POSITION
The MBC has measured shaft displacement is greater than 100 µm (100 micron) from
center in the orthogonal radial axis designated W at the opposite-impeller end radial
magnetic bearing during Levitation or Rotation mode (approximately 2/3 of the air gap
space to the touchdown bearing). 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 displacement is less than 100 µm (100 micron).
MBC – VW13 VIBRATION
The MBC has measured synchronous speed (first harmonic) shaft vibration at the impeller
end radial magnetic bearing is greater than 45 µm (45 micron) peak amplitude in Rotation
mode. This condition is monitored only when the AVR and ABS filter is on, which occurs
for speed above 70 Hz. 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
fault is released when vibration is less than 45 µm (45 micron).
MBC – VW24 VIBRATION
The MBC has measured synchronous speed (first harmonic) shaft vibration at the
opposite-impeller end radial magnetic bearing is greater than 45 µm (45 micron) peak
amplitude in Rotation mode. This condition is monitored only when the AVR and ABS filter
is on, which occurs for speed above 70 Hz. 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 fault is released when vibration is less than 60 µm (60 micron).
MBC – Z12 LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 100 µm (100 micron) axially
from the design running position over a 7 second window (approximately 1/3 of the air
gap space to the touchdown bearing axially). 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 fault is released when displacement is less than 100 µm (100
micron).
YVAM Control Center 96