JOHNSON CONTROLS
95
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
3
MESSAGE DESCRIPTION
MBC – V24 LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 90 µm 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.
MBC – V24 POSITION
The MBC has measured shaft displacement is greater than 100 µm 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.
MBC – W13 LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 90 µm 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.
MBC – W13 POSITION
The MBC has measured shaft displacement is greater than 100 µm 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.
MBC – W24 LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 90 µm from center in the or-
thogonal 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.
MBC – W24 POSITION
The MBC has measured shaft displacement is greater than 100 µm 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.
MBC – VW13 VIBRATION
The MBC has measured synchronous speed (rst harmonic) shaft vibration at the
impeller end radial magnetic bearing is greater than 45 µm peak amplitude in Rotation
mode. This condition is monitored only when the AVR and ABS lter 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.
MBC – VW24 VIBRATION
The MBC has measured synchronous speed (rst harmonic) shaft vibration at the
opposite-impeller end radial magnetic bearing is greater than 45 µm peak amplitude
in Rotation mode. This condition is monitored only when the AVR and ABS lter 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.
MBC – Z12 LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 100 µm 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.
TABLE 11 - CYCLING SHUTDOWN MESSAGES (CONT'D)
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