JOHNSON CONTROLS
120
FORM 160.78-O2
ISSUE DATE: 5/22/2017
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
MESSAGE DESCRIPTION
MBC – V13 POSITION
The MBC has measured shaft displacement is greater than 75 µm from center in the
orthogonal radial axis designated V at the impeller end radial magnetic bearing during
Levitation or Rotation mode (approximately 1/2 of the air gap space to the touchdown
bearing). 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 displacement is less than 75 µm.
MBC – V24 LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 75 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 1/3 of the
air gap space to the touchdown bearing). 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 warning is released when
displacement is less than 75 µm.
MBC – V24 POSITION
The MBC has measured shaft displacement is greater than 75 µm from center in the
orthogonal radial axis designated V at the opposite-impeller end radial magnetic bearing
during Levitation or Rotation mode (approximately 1/2 of the air gap space to the touchdown
bearing). 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 displacement is less than 75 µm.
MBC – W13 LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 75 µm from center in the
orthogonal radial axis designated W at the impeller end radial magnetic bearing dur-
ing Levitation or Rotation mode over a 7 second window (approximately 1/3 of the air
gap space to the touchdown bearing). 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 warning is released when
displacement is less than 75 µm.
MBC – W13 POSITION
The MBC has measured shaft displacement is greater than 75 µm from center in the
orthogonal radial axis designated W at the impeller end radial magnetic bearing during
Levitation or Rotation mode (approximately 1/2 of the air gap space to the touchdown
bearing). 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 displacement is less than 75 µm.
MBC – W24 LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 75 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 1/3 of the
air gap space to the touchdown bearing). 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 warning is released when
displacement is less than 75 µm.
MBC – W24 POSITION
The MBC has measured shaft displacement is greater than 75 µm from center in the
orthogonal radial axis designated W at the opposite-impeller end radial magnetic bearing
during Levitation or Rotation mode (approximately 1/2 of the air gap space to the touchdown
bearing). 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 displacement is less than 75 µm.
MBC – VW13 VIBRATION
The MBC has measured synchronous speed (rst harmonic) shaft vibration at the
impeller end radial magnetic bearing is greater than 60 µm from 0 to the peak amplitude
in Rotation mode. This condition is monitored only when the AVR and ABS lter is on,
which occurs for speed above 80 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 warning is released when
vibration is less than 60 µm.
TABLE 8 - CYCLING SHUTDOWN MESSAGES (CONT'D)
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