Johnson Controls YORK YMC2 Operation And Maintenance Manual

Table 99: Cycling shutdown messages
Message Description
MBC – V24
LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 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 micron.
MBC – V24 POSITION
The MBC has measured shaft displacement is greater than 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 micron.
MBC – W13
LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 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 micron.
MBC – W13 POSITION
The MBC has measured shaft displacement is greater than 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
micron.
MBC – W24
LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 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 micron.
105
YMC
2
Mod B with OptiView Control Center

Johnson Controls YORK YMC2 Specifications

General

Brand	Johnson Controls
Model	YORK YMC2
Category	Chiller
Language	English