JOHNSON CONTROLS
96
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
MESSAGE DESCRIPTION
MBC – Z12 POSITION
The MBC has measured shaft displacement is greater than 100 µm axially from the
design running position (approximately 1/2 of the air gap space to the touchdown bearing
axially). 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 µm.
MBC - Z12 VIBRATION
The MBC has measured a vibration in axial position at 1 times the rotating frequency
whose amplitude exceeds 60 µm. This frequency axially can be the image of the rotor
axial run-out.
This fault is available when AVR or ABS are activated. 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 fault is released when this displacement is less than
60 µm.
MULTIUNIT CYCLING –
CONTACTS OPEN
The Multiunit Cycling contacts connected to I/O Board TB4-9, have opened to initiate a
cycling shutdown. If the chiller is running when this occurs, the Pre-rotation Vanes are
driven fully closed prior to shutting down the chiller. The chiller will automatically restart
when the contacts close.
SYSTEM CYCLING –
CONTACTS OPEN
The System Cycling contacts connected to I/O Board TB4-13, have opened to initiate a
cycling shutdown. If the chiller is running when this occurs, the Pre-rotation Vanes are
driven fully closed prior to shutting down the chiller. The chiller will automatically restart
when the contacts close.
UPS – LINE LOW BATTERY
VOLTAGE
This cycling fault initiates a soft shutdown if it is set while the chiller state is Running. It
is set during chiller state Running or Soft Shutdown when all of the following are true:
• Battery Voltage Faults setting is “Enabled”
• “Warning – UPS – Line Low Battery Voltage” warning has been set for 60 continuous
minutes
This fault is also set during chiller state Stopped when all of the following are true:
• Battery Voltage Faults setting is “Enabled”
• Control Voltage digital input is high (indicates line power is available)
• Battery Voltage < Line Low Battery Voltage Threshold
It is released when any of the following are true:
• Battery Voltage Faults is Disabled
• Battery Voltage > Line Low Battery Voltage Threshold + 0.1 V.
VSD – DC BUS
PRE-REGULATION
The DC Bus voltage has not increased to a value of +/- 50 volts of the DC Bus voltage
setpoint of 785 VDC within 2 seconds after entering the pre-regulation state. If this con-
dition does not pass, then this shutdown is generated.
The VSD will attempt another pre-charge and pre-regulation cycle after a delay of 10
seconds. If this shutdown occurs three consecutive times, then the chiller will lock out
on a “VSD – DC BUS PRE-REGULATION LOCKOUT”.
VSD – HIGH DC BUS VOLTAGE
If the DC Bus voltage exceeds the value for the given model of drive, then this shutdown
will occur. Typically, this shutdown will occur when there is a sudden change in the input
voltage due to storms, utility power problems, or site power problems
DRIVE MODEL HIGH DC BUS VOLTAGE SHUTDOWN VALUE
0490, 0490A 878 VDC
0612A, 0730A, 0774, 1278A 985 VDC
VSD – HIGH INTERNAL
AMBIENT TEMPERATURE
The variable speed drive contains two temperature sensors, which monitor the unit’s
internal ambient temperature. This shutdown is generated when the higher of the two
ambient temperatures exceeds a high limit of 158°F (70°C). The unit’s fan(s) and water
pump(s) remain energized until the internal temperature drops below 148°F (64°C),
after which they shall be de-energized and the fault can be cleared. Some potential
causes for this shutdown are internal VSD fan failure, VSD coolant pump failure, enter-
ing condenser water temperature higher than design, condenser water ow lower than
required, fouled VSD heat exchanger, or restriction of condenser water to the VSD.
TABLE 11 - CYCLING SHUTDOWN MESSAGES (CONT'D)
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