JOHNSON CONTROLS
106
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
MESSAGE DESCRIPTION
WATCHDOG –
SOFTWARE REBOOT
The Microboard’s software Watchdog initiated a Microprocessor reset because it detected that
a portion of the chiller operating program was not being executed. The result of this reset is
a Safety shutdown and re-initialization of the program. This is generally indicative of a severe
electrical power disturbance or impending Microboard failure. The chiller can be started after the
COMPRESSOR switch is placed in the Stop-Reset (O) position.
UPS – BATTERY NOT
CONNECTED
This safety 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 is Enabled
• “Warning - UPS - Battery Not Connected” warning has been set for 10 continuous minutes
This fault is also set during chiller state Stopped when all of the following are true:
• Battery Voltage Faults is Enabled
• Battery Disconnected Counter >= 4
It is released when any of the following are true:
• Battery Voltage Faults is Disabled
• Battery Disconnected Counter is 0
UPS – INVERTER LOW
BATTERY VOLTAGE
This safety fault is set when all of the following are true for 5 continuous seconds:
• Battery Voltage Faults is Enabled
• Control Voltage digital input is low (indicates line power is lost)
• Battery Voltage < Inverter 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. (Note the thresholds for set
and release are intended to be different)
VGD ACTUATOR
FAULT
The VGD actuator fault digital input has lost voltage either by wiring issue or fault indicated at
the actuator. The chiller begins a standard soft shutdown. The fault clears when the digital input
sees voltage. When the condition clears, the chiller can be started after the CLEAR FAULTS key
is pressed.
VGD POSITIONING
FAULT
The VGD Position feedback indicates greater or less than the VGD command by 5% for 1 min-
ute continuous. The fault clears when the position is within the command + 5 % over 1 minute.
When the condition clears, the chiller can be started after the CLEAR FAULTS key is pressed.
VGD FEEDBACK
FAULT
The VGD Feedback voltage is below 0.4 VDC or above 4.6 VDC. It is released when voltage is
within the range. When the condition clears, the chiller can be started after the CLEAR FAULTS
key is pressed.
VSD – DC BUS
LOCKOUT –
DO NOT CYCLE
POWER
When the unit is stopped in a mode where no command exists to energize the DC Bus, the DC
Bus voltage is monitored and checked against a threshold level of 100 VDC every ve minutes.
If the DC Bus voltage is higher than the threshold value, this shutdown is generated. When the
condition clears and VSD input modules tested and determined acceptable the chiller can be
started after the CLEAR FAULTS key is pressed.
VSD – DC BUS
PRE-REGULATION
LOCKOUT
If the unit fails to complete pre-regulation (due to VSD – DC BUS PRE-REGULATION fault), it
shall have to repeat pre-charge in order to attempt another pre-regulation. The VSD shall wait
10 seconds before clearing the DC Bus voltage pre-regulation fault and allowing another pre-
charge to start. The unit’s fan(s) and water pump(s) shall remain energized during this wait time.
The VSD shall allow up to three consecutive pre-regulation related faults (i.e. VSD-DC BUS
REGULATION) to occur. After the third consecutive fault, this shutdown is generated. When the
condition clears, the chiller can be started after the CLEAR FAULTS key is pressed.
TABLE 12 - SAFETY SHUTDOWN MESSAGES (CONT'D)
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