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An alarm is considered "Active" (Triggered) if "State" = 1,
meaning that it is still active in the PLC.
An alarm is considered "Not Active" (Not Triggered) if
"State" = 0, and it can be reset using Reset button.
Time
This column is the date-time stamp indicating exactly
when the alarm occurred.
Description
This column describes all refrigeration cycle related
alarms, and captures the instantaneous values of the
following parameters: Discharge Pressure, Suction
Pressure, EXV Position, Suction Superheat Temperature,
Evaporator Leaving Water Temperature, Condenser
Leaving Water Temperature, Source Leaving Water
Temperature. This functionality applies to the following
alarms: Compressor Failure, Compressor Lockout,
Evaporator Freeze Alarm, Source Freeze Alarm,
Evaporator Flow Alarm, Condenser Flow Alarm, Source
Flow Alarm, Discharge Pressure and Suction Pressure.
Check / Uncheck All
This button is used for selecting and deselecting all listed
alarms with a single action.
'Hide Not Triggered' Drop Down Menu
This is used to either list all the alarms, both active and
non-active, or only active alarms (the default selection).
Ack
Pressing this button acknowledges the alarm and removes
it from the active alarms list.
Reset
Pressing this button allows a specific non-active alarm to
remain on the active alarms list.
Save
Pressing this button saves the changes made to the active
alarms list. Any changes that are made without saving will
be lost.
ARTC-SVX005A-EN
Reset PLC
This button, located in the upper right portion of the
screen, resets the active alarms in the master
microprocessor, so they could be further acknowledged or
reset on the touchscreen interface.
Only those alarms for which the alarm condition is 'false'
can be Reset in the microprocessor controller; otherwise,
the reset PLC button will have no effect.
Example: An evaporator freezing alarm occurs when the
evaporator Leaving Water Temperature (LWT) drops
below the freezing alarm threshold, which is 36.0 °F (2.2
°C). The alarm occurs and:
• The alarm can be reset when the reset PLC button is
pressed and the evaporator LWT is below the
freezing alarm threshold. The freezing alarm
threshold equals 36.0 °F (2.2 °C) by default.
• The LWT is below 36.0 °F (2.2 °C). The alarm cannot
be reset until the evaporator LWT exceeds 37.0 °F
(2.8 °C).
• The LWT is above 37.0 °F (2.8 °C). Pressing the reset
PLC button clears the alarm.
A list of all chiller/heater alarms are found in
- Active Alarm List," p.
76.
Alarm History
On the active alarms screen, pressing the Alarm History
button displays the alarm history screen.
Operating Procedures
"Appendix C
43
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