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Setting up the alarm setup parameters
The following table provides information about the alarm parameters and their corresponding descriptions.
Alarm vs warnings
The alarm setup includes a delay parameter. When an alarm condition crosses the alarm threshold, the alarm does
not occur until after the delay period. The alarm warning condition is active in this situation. The Alarm icon glows
yellow to indicate an alarm warning. Alarm warnings do not cause the alarm relay to energize and the system does
not add an alarm to the event log.
Cooling and system shutdown
The following sections provide information about the A5xx Controller’s cooling and system shutdown features.
Cooling shutdown
A cooling shutdown can occur when one of the two universal input modes receives an external signal. The
controller turns off the compressor and the evaporator fan when the system receives an external signal.
System shutdown
A system shutdown takes priority over the normal control of the compressor, defrost, and evaporator fan relays. A
system shutdown can occur if an alarm condition such as man-in-room, refrigerant leak, or emergency switch
activates. During a system shutdown, all outputs are set to off with the exception of the alarm output. The controller
can enter a system shutdown state by detection of a refrigerant leak, if enabled, or by the configuration of a
universal input to provide this signal.
Table 14: A5xx Controller alarm parameters and descriptions
Alarm parameter Description
Threshold Each alarm uses specific levels, units, or ranges for its threshold. For example, temperature alarms
use Fahrenheit or Celsius values, the door open alarm uses a time value, and a binary input uses a
1 or 0 or open or closed to indicate an alarm state.
Buzzer Select ON or OFF to enable or disable the buzzer parameter.
Delay The delay parameter value is in minutes. The alarm condition remains true for this defined number of
minutes before an alarm energizes. If the alarm condition clears before the number of minutes
elapses, no alarm action occurs. To trigger an alarm immediately, set the number of minutes to zero.
Auto-clear Select a latching alarm or a self-clearing alarm.
• You must acknowledge a latching alarm at the A5xx Controller. The Alarm icon glows, the alarm
relay energizes, and if you enable the buzzer, it sounds until you acknowledge the alarm, even if
the alarm condition is no longer true.
• If the underlying alarm condition clears, the self-clearing alarm no longer identifies itself as true.
Re-alarm interval The re-alarm interval parameter value is in minutes. If you acknowledge an alarm and the alarm
relay deactivates but the alarm condition persists for the defined number of minutes, the alarm relay
reactivates.
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