Table 92: Safety shutdown messages
Message Description
MBC – POWER
FAIL LANDING
This Safety Shutdown is set when the panel boots up after a power loss has
occurred and the buffer data prior to the shutdown showed motor speed
> 0, indicating the motor was rotating when the UPS power was lost. If the
Power Fail Landing Counter on the MBC Details Screen is < 5, the chiller
can be restarted after the cause of a loss of UPS power is determined and
remedied and the OptiView
™
panel CLEAR FAULTS key is pressed. IF the Power
Fail Landing Counter is => 5, lockout occurs and must be reset by a service
technician according to the procedure in the Calibration and Troubleshooting
Section of Form 160.84-M2.
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 determine which specific conditions
were not met.
131
YMC
2
Mod B with OptiView
™
Control Center
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