Refrigeration Alarms Configuration - Danfoss AK2-SC 255 Reference Manual

Refrigeration alarms
configuration
RS.8D.M1.22
Liquid %
As refrigeration configuration changes, alarms are automatically created (but not
enabled) for the analog and digital inputs created. Trip levels and time limits can be set
for these alarms by selecting Alarms from the Configure Rack menu and pressing
ENTER.
The Configure Rack Alarms menu looks like the illustration at left below:
The set of alarms that are created automatically as you proceed with configuration of
a rack is shown in the menu; by selecting one of the menu items (in this case Suc-
tion), the alarms for that part of the rack are presented. The first page of suction
alarms is shown at right above. One of the list boxes has been opened to reveal its
options.
For each alarm, the first line contains an alarm type, the name of the point the alarm is
based on, and the point's address. The second line contains the alarm action setting
(Critical, Normal, Log only, or Disabled), the trip level setting (if based on an
analog (sensor) input, and the time setting. If the action is set to Disabled, the level
and time settings will not appear (but are retained in memory), as is the case with all
in the example screen except the last alarm (High Temperatuare Suction Temp AA).
There are five times when alarms are not generated for refrigeration temperatures:
(1) during keyswitch overrides; (2) during the delay after override; (3) during defrost;
(4) during the delay after defrost; and (5) when alarms have been suspended. The
two delay periods are defined in the refrigeration configuration screen for the each
circuit
The meanings of the alarm action settings are as follows:
AK2-SC 255 Reference Manual
On/Off input: A digital sensor is used for liquid level.
None: There is no liquid level sensor monitored.
(-99.0 to 99.9) The liquid level, as a percentage of
receiver volume, at and below which heat reclaim will
be locked out.
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