Table 91: Cycling shutdown messages
Message Description
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 (first 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 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.
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 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.
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.
MBC – Z12 POSITION
The MBC has measured shaft displacement is greater than 100 µm
axially from the design running position (approximately 1/2 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
shutdown is released when displacement is less than 100 µm.
MBC - Z12 VIBRATION
The MBC has measured a vibration in axial position at 1 times the
rotating frequency whose amplitude exceeds 60 µm. This frequency
axially can be the image of the rotor axial run-out.
This fault is available when AVR or ABS are activated. 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 this displacement is less than 60 µm.
119
YMC
2
Mod B with OptiView
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