Johnson Controls YORK YVAM 0350, Operation & Maintenance Manual

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Table 92: Safety shutdown messages
Message Description
SURGE PROTECTION
– EXCESS SURGE
This message applies only if the Surge Protection Shutdown feature is enabled.
The Surge Window Count surge events exceeded the Count Limit setpoint. The chiller shuts down as
soon as the count exceeds the limit. The chiller can be started after the Clear Fault button is pressed.
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
The fault 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
The fault is released when any of the following are true:
• Battery Voltage Faults is Disabled
• Battery Voltage > Line Low Battery Voltage Thr 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 detects
voltage. When the condition clears, the chiller can be started after the Clear Faults button 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 c 5 % over 1 minute. When the
condition clears, the chiller can be started after the Clear Faults button 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 button is pressed.
VSD – DC BUS
LOCKOUT – DO NOT
CYCLE POWER
Anytime the chiller is in a non-running condition, the DC Bus voltage is monitored and checked
against a threshold level of 100 VDC every five minutes. If the DC Bus voltage is higher than the
threshold value, this shutdown is generated. When the condition clears and drive input modules are
tested and determined acceptable the chiller can be started after the Clear Faults button is pressed.
VSD – DC BUS
PRE-REGULATION
LOCKOUT
If the drive fails to complete pre-regulation due to VSD – DC BUS PRE-REGULATION fault, it must
repeat pre-charge in order to attempt another pre-regulation. The drive waits 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) remain energized during this wait time. The drive allows up to three
consecutive pre-regulation related faults (that is 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 button is pressed.
107 YVAM Control Center