IC 915 LX 6/10
The alarm condition is always signalled
by a buzzer (if present) and the alarm
icon
LED. The alarm signals from the
• control probe that measures values out-
side the nominal reading range
• control probe faulty/shorted/open
probe appears directly on the instrument
display as E1.
Note: to prevent false alarms, the error
condition must persist for more than 10
seconds.
An error condition in probe 1 (regulation)
leads to:
• E1 code appears on display
• the controller being activated as indicat-
ed by the “On1(On2)” and “OF1(OF2)”
parameters if programmed for the duty
cycle or... (see DUTY CYCLE diagram)
MAXIMUM AND MINIMUM TEMPERA-
TURE ALARM (SEE PAR. H04)
If an alarm condition occurs and alarm
exclusion times are not in progress (see
alarm exclusion parameters), the alarm
icon lights up permanently and the relay
that is configured as an alarm is activated.
This type of alarm does not affect the
regulating in progress.
Alarms are considered as absolute
(default) values or as values related to the
Set point (the distance from the Set point
itself) and based on the Att parameter. If
the alarms are relative (Att=1), the para-
meter HA1(2) is set to positive values and
LA1(2) to negative values.
This alarm condition can be viewed in the
folder “AL” with labels “AH1-AL1”.
EXTERNAL ALARM
The device can also control an external
alarm, i.e. from a digital input. If the digi-
tal input is enabled, the alarm control is
activated by programming and remains
enabled until the next time the digital
input is deactivated. The alarm is signalled
by turning on the fixed alarm icon, acti-
vating the relay configured as alarm and
deactivating compressor, defrost and fan
controls (if specified by the “H11=5” para-
meter). This alarm condition can be dis-
played in the “AL” folder using the “EA”
label. The relay can be silenced; even if
the alarm icon starts blinking, the con-
trollers remain locked until the next time
the digital input is deactivated.
OPEN DOOR ALARM
If a door is open, the Open Door alarm is
signalled in response to a delay defined
by the tdO parameter.
The alarm is signalled by the flashing
alarm icon. This alarm condition can be
viewed in the “AL” folder with the label
“Opd”.
DIAGNOSTICS
DISPLAY
E1
E2
If simultaneous, they will be shown on the display
alternately every 2 seconds
FAULT
Faulty probe 1 (thermostat control)
Faulty probe 2 (evaporator)
Table of faulty probes
DISPLAY
AH1**
AL1**
EA
Opd
Press any button to silence the alarm. The LED will
start to blink.
ALARM
High temperature alarm (referring to
probe Pb1/Pb2 based on par. H04)
Low temperature alarm (referring to
probe Pb1/Pb2 based on par. H04)
External alarm
Door Open Alarm
Alarm table
Minimum temperature alarm
Maximum temperature alarm
Temperature lower than or equal to LA1(2) (LA1(2) with sign)
Temperature lower than or equal to set point +LA1(2) positive only)
Temperature greater than or equal to set point +HA1(2) (HA1(2) positive only)
Temperature greater than or equal to HA1(2) (HA1(2) with sign)
Maximum temperature alarm
back swing
Minimum temperature alarm
back swing
Temperature greater than or equal to LA1(2)+AFd Temperature greater than or equal to set point + LA1(2) + AFd
set point -|LA1(2)|+AFd
Temperature lower than or equal to set point+HAL-AFd
Temperature lower than or equal to HA1(2)-AFd
Temperature expressed as an absolute value (par “Att0)
Abs(olute)
Temperature expressed in relation to set point
(par “Att”=0) reL(ative)
if Att=reL(ative) LA1(2) must be negative: therefore
set point+LAL<set point because set point+(-|LA1(2)|)=set-|LA1(2)|
ALARM DIAGRAM HIGH AND LOW TEMPERATURE
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