Arctiko LTF 225, Operating Instructions Manual, Page: 10 / 20

10
ALARMS
ALARM RELAY MANAGEMENT
DIGITAL INPUT
ALC Temperature alarms configuration:
(Ab; rE)
Ab= absolute temperature: alarm temperature is given by the ALL or ALU values. rE = temperature
alarms are referred to the set point. Temperature alarm is enabled when the temperature exceeds the
“SET+ALU” or “SET-ALL” values.
ALU MAXIMUM temperature alarm:
(SET÷150°C; SET÷302°F) when this temperature is reached the
alarm is enabled, after the “ALd” delay time.
ALL Minimum temperature alarm:
(-100.0 ÷ SET°C; -148÷302°F) when this temperature is reached the
alarm is enabled, after the “ALd” delay time.
AFH Differential for temperature alarm recovery:
(0,1÷25,5°C; 1÷45°F) Intervention differential for
recovery of temperature alarm.
Ald Temperature alarm delay:
(0÷255 min) time interval between the detection of an alarm condition and
alarm signalling.
dAo Exclusion of temperature alarm at startup:
(from 0.0 min to 23.5h) time interval between the
detection of the temperature alarm condition after instrument power on and alarm signalling.
tbA Alarm relay silencing (with oA1=ALr):
(n= silencing disabled: alarm relay stays on till alarm
condition lasts, y =silencing enabled: alarm relay is switched OFF by pressing a key during an alarm).
Aro Alarm relay activation with power failure:
y = the alarm relay is activated if a temperature alarm happens during a power failure
n = the alarm relay is never activated during a power failure
ALF Alarm relay activation for all the alarms:
y = the alarm relay is activated for all the alarms
n = the alarm relay is activated only in case temperature alarms and regulation probe failure.
bon Time of buzzer restart after muting, in case of alarm duration:
(0÷30min; with 0 the buzzer is
always off after muting)
AoP Alarm relay polarity:
it set if the alarm relay is open or closed when an alarm happens.
CL= terminals 1-2 closed during an alarm; oP = terminals 1-2 open during an alarm
i1P Digital input polarity:
oP: the digital input is activated by opening the contact; CL: the digital input is
activated by closing the contact.
i1F Digital input configuration:
EAL = external alarm: “EA” message is displayed; bAL = serious alarm
“CA” message is displayed. PAL = pressure switch alarm, “CA” message is displayed; dor = door
switch function; dEF = activation of a defrost cycle; AUS =to switch on the second relay if oA1 = AUS;
Htr = kind of action inversion (cooling – heating); FAn = not set it; ES = Energy saving.
did:
(0÷255 min)
with i1F= EAL or i1F = bAL digital input alarm delay:
delay between the detection of
the external alarm condition and its signalling.
with i1F= dor: door open signalling delay
with i1F = PAL: time for pressure switch function:
time interval to calculate the number of the
pressure switch activation.