Table 92: Safety shutdown messages
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 minute 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.
YMC
2
Mod B with OptiView
™
Control Center
134
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