JOHNSON CONTROLS
103
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
3
MESSAGE DESCRIPTION
MBC – HIGH BEARING
Z2 TEMPERATURE
This Safety Shutdown is set when the MBC detects a temperature is greater than 266ºF (130ºC)
on the opposite-impeller end axial magnetic bearing. The MBC Fault contacts open. The MBC
remains in Levitation mode with the motor shaft levitated until the VSD rotation signal indicates
is less than 10 Hz. This shutdown is released when temperature is less than 266ºF (130ºC). The
chiller can be started when the condition is released and the OptiView™ panel CLEAR FAULTS
key is pressed.
MBC – HIGH INPUT
VOLTAGE
Main DC supply voltage to the MBC exceeded 165VDC (150+ 10%)
MBC – NO LEVITATION
This Safety Shutdown is set when OptiView™ software is commanding MBC Levitation Mode
ON but the MBC is not reporting Levitated within 15 seconds. This fault is prohibited when the
MBC Alive input is not high, indicating the MBC unavailable. This fault is released when the
chiller is stopped. The chiller can be started when the condition is released and the OptiView™
panel CLEAR FAULTS key is pressed.
WARNING – MBC –
HIGH RADIAL
OSCILLATOR VOLT-
AGE
This Safety Shutdown is set when the internal oscillator that drives the radial position sensor coil
is overloaded for one continuous second. This is typically the result of an open in the connection
to the shaft position sensor. It could also be a failure of the MBC control board. The MBC Fault
contacts open. The shutdown is released when the Oscillator voltage drop is normal. The chiller
can be started when the condition is released and the OptiView panel CLEAR FAULTS key is
pressed.
MBC – LOW RADIAL
OSCILLATOR VOLT-
AGE
This Safety Shutdown is set when the internal oscillator that drives the radial position sensor
coil is low for one continuous second. This is typically the result of a short in the connection to
the shaft position sensor. It could also be a failure of the MBC control board. The MBC Fault
contacts open. The shutdown is released when the Oscillator voltage drop is normal. The chiller
can be started when the condition is released and the OptiView panel CLEAR FAULTS key is
pressed.
MBC – HIGH AXIAL
OSCILLATOR VOLT-
AGE
This Safety Shutdown is set when the internal oscillator that drives the axial position sensor coil
is overloaded for one continuous second. This is typically the result of an open in the connection
to the shaft position sensor. It could also be a failure of the MBC control board. The MBC Fault
contacts open. The shutdown is released when the Oscillator voltage drop is normal. The chiller
can be started when the condition is released and the OptiView panel CLEAR FAULTS key is
pressed.
MBC – LOW AXIAL
OSCILLATOR VOLT-
AGE
This Safety Shutdown is set when the internal oscillator that drives the axial position sensor
coil is low for one continuous second. This is typically the result of a short in the connection to
the shaft position sensor. It could also be a failure of the MBC control board. The MBC Fault
contacts open. The shutdown is released when the Oscillator voltage drop is normal. The chiller
can be started when the condition is released and the OptiView panel CLEAR FAULTS key is
pressed.
MBC – OVERSPEED
FAULT
This Safety Shutdown is set when the MBC determines the rotor speed exceeds the pro-
grammed setpoint of 360 Hz for 0.1 seconds continuous. Rotor speed is transmitted to the MBC
from the VSD. The MBC Fault contacts open. The MBC remains in Levitation mode with the mo-
tor shaft levitated until commanded to de-levitate over serial comms. This shutdown is released
when the speed signal no longer exceeds the setpoint, which should occur when the chiller is
stopped. The chiller can be started when the condition is released and the OptiView™ panel
CLEAR FAULTS key is pressed.
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 Land-
ing 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.
TABLE 12 - SAFETY SHUTDOWN MESSAGES (CONT'D)
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