JOHNSON CONTROLS
104
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
MESSAGE DESCRIPTION
MBC – ROTOR
CONTRACTION
This Safety Shutdown is set when the MBC has calculated the algebraic difference between
the displacement at shaft impeller end axial position sensor and the shaft opposite-impeller end
axial position sensor is less than -100 µm. 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 the difference in displacements is over -100 µm. The chiller
can be started when the condition is released and the OptiView panel CLEAR FAULTS key is
pressed.
MBC – ROTOR
ELONGATION
This Safety Shutdown is set when the MBC has calculated the algebraic difference between
the displacement at shaft impeller end axial position sensor and the shaft opposite-impeller end
axial position sensor is greater than 700 µm. 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 the difference in displacements no longer exceeds 700
µm. The chiller can be started when the condition is released and the OptiView™ panel CLEAR
FAULTS key is pressed.
MBC – SPEED SIGNAL
FAULT
This Safety Shutdown is set when the MBC has the speed signal cycling fault three times in a
90-minute window. The window is started when not currently in a window and a MBC Speed
Signal cycling fault is received. 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 a valid speed signal over 10 Hz is presented or the MBC is not in
Rotation mode. The chiller can be started when the condition is released and the OptiView™
panel CLEAR FAULTS key is pressed.
SAFETY STOP
This is set when the panel safety stop hardware pushbutton is depressed, removing input from
the I/O Board terminal TB3-28 for > 500msec. continuous. It also sets the local command to
STOP. The chiller can be started when the pushbutton is released and the OptiView™ panel
CLEAR FAULTS key is pressed.
MBC – STARTUP
FAILURE
This Safety Shutdown is set when the chiller initiates three MBC-STARTUP FAILURE Cycling
Shutdown in a 90 minute period. Refer to YORK YMC
2
Service Manual (Form 160.84-M2) for
conditions necessary to complete MBC startup successfully. Check fault history details to deter-
mine which specic conditions were not met.
MBC – SPV
UNAUTHORIZED
ROTATION
This Safety Shutdown is set when the MBC is commanded to Rotation mode while it is not indi-
cating acceptable to rotate. 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 the rotation mode command is coincident with MBC levitated and rotation allowed contacts
closed. The chiller can be started when the condition is released and the OptiView™ panel
CLEAR FAULTS key is pressed.
MBC – DSP
UNAUTHORIZED
ROTATION
This Safety Shutdown is set when the MBC detects a rotor speed signal from the VSD while the
Levitation Mode is not activated. The MBC Fault contacts open. The MBC remains in Levita-
tion mode with the motor shaft levitated until commanded to de-levitate over serial comms. This
shutdown is released when the MBC Levitation or Rotation mode is activated or the VSD speed
signal indicates no shaft rotation. The chiller can be started when the condition is released and
the OptiView™ panel CLEAR FAULTS key is pressed.
MOTOR – HIGH
WINDING
TEMPERATURE
This safety shutdown occurs when any of the enabled motor winding temperatures exceeded
the programmed High Winding Temperature Shutdown Threshold of 302˚F (150˚C) for 3 continu-
ous seconds.
The chiller can be started after all winding temperatures decreased to at least 18˚F (10˚C) below
the shutdown threshold and the COMPRESSOR is stopped. The safety shutdown will not act
on any individual winding temperature sensor that has been disabled with the TEMPERATURE
DISABLE Setpoint on the Motor Details Screen.
MOTOR – HIGH ROTOR
TEMPERATURE
This safety shutdown occurs when the estimated rotor temperature exceeds 250.0˚F for 3 con-
tinuous seconds. The fault is released and the chiller can be restarted when the estimated rotor
temperature is below 230˚F and the OptiView panel CLEAR FAULTS key is pressed.
TABLE 12 - SAFETY SHUTDOWN MESSAGES (CONT'D)
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