JOHNSON CONTROLS
102
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
MESSAGE DESCRIPTION
INTERNAL ERROR –
INVALID BRAM
BRAM is detected to be a size other than 512K. Clears when proper size BRAM is detected
upon boot up.
ISOLATION VALVES –
NOT OPENED
The optional brine freeze protection motorized isolation valves Open output is energized > 40
seconds but the feedback from the valve limit switch does not indicate it opened for 3 continu-
ous seconds. This cycling fault is released when the chiller is stopped with the run command
removed. The chiller can be started when the condition is released and the OptiView™ panel
CLEAR FAULTS key is pressed.
MBC – CUSTOMER
SERIAL LINK
DISABLED
This Safety Shutdown is set when the MBC Local/Remote Modbus command is not reported
from the MBC as set for panel control. This would be caused if the MBC were accessed via a
computer using diagnostic software and the serial communication setting then changed in the
Remote Command tab from Customer Serial Link to another choice. The chiller can be started
when the MBC setting is restored and the OptiView™ panel CLEAR FAULTS key is pressed.
MBC – DSP
COMMUNICATION
This Safety Shutdown is set when the MBC control board detects a communication error within
the control board of the MBC. 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 board-level communication failure is resolved. The chiller can
be started when the condition is released and the OptiView™ panel CLEAR FAULTS key is
pressed.
MBC – AMP
COMMUNICATION
This Safety Shutdown is set when the MBC control board detects a communication error
between the control and amplier boards of the MBC. 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 board-level communication failure is
resolved. The chiller can be started when the condition is released and the OptiView™ panel
CLEAR FAULTS key is pressed.
MBC – AMP
WATCHDOG
This Safety Shutdown is set when the MBC determines a lapse in internal microprocessor
activity on the Amplier Board through its Watchdog device. The MBC Fault contacts open. The
MBC will not react to a levitation mode change command via serial comms. The MBC remains
in the levitation mode it was in when the fault occurred until power is removed. Power must be
removed from the UPS to the MBC. The chiller can be started when the condition is released
and the OptiView™ panel CLEAR FAULTS key is pressed.
MBC – DSP WATCH-
DOG
This Safety Shutdown is set when the MBC determines a lapse in internal microprocessor
activity on the Control Board through its Watchdog device. The MBC Fault contacts open. The
MBC will not react to a levitation mode change command via serial comms. The MBC remains
in the levitation mode it was in when the fault occurred until power is removed. Power must be
removed from the UPS to the MBC. The chiller can be started when the condition is released
and the OptiView™ panel CLEAR FAULTS key is pressed.
MBC – EXCESSIVE
SHUTDOWNS
This Safety Shutdown is set if 3 MBC Cycling Shutdowns occur in a 15 minute window. It is
released when the chiller is stopped. The 15 minute window begins with the rst MBC fault. The
chiller can be started when the condition is released and the OptiView™ panel CLEAR FAULTS
key is pressed.
MBC – HIGH AMPLI-
FIER
TEMPERATURE
This Safety Shutdown is set when the MBC amplier temperature exceeds 158°F (70°C) for 1
seconds continuous. The MBC Fault contacts open. The MBC remains in Levitation mode with
the motor shaft levitated until the VSD rotation signal indicates less than 10 Hz. Then the MBC
de-levitates the rotor. The shutdown is released when amplier temperature drops below the trip
value. Check the connection of the board to the heatsink and the response of the temperature
sensor on the board. The chiller can be started when the condition is released and the OptiV-
iew™ panel CLEAR FAULTS key is pressed.
MBC – HIGH BEARING
Z1 TEMPERATURE
This Safety Shutdown is set when the MBC detects a temperature is greater than 266ºF (130ºC)
on the 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.
TABLE 12 - SAFETY SHUTDOWN MESSAGES (CONT'D)
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