49
Allarme “CHt” e o refrigerazione (ripristino manuale)
temp. condensatore
Preallarme
solo visualizzazione allarme “cht”
(ripristino automatico)
“AC” - “AE”/2
“Ac”“Ac-AE”
ON
temp. condensatore
“AE”
“Ac”
Fig. 7.m
Fig. 7.n
ENGLISH
ir33 +030220441 - rel. 2.0 - 01.05.2006
Ado: Light management mode with door switch (masked parameter)
This parameter is used to select the algorithm for managing the door.
Ado Light when opening the door Algorithm Description
0 off
on
normal
extended
open-close
open-close-open-close
1 off
on
extendednor-
mal
open-close-open-close
open-close
Tab. 7.i
Note: if the digital input is selected so as not to manage the light (A4, A5 = 13 or 14) the algorithm
is modifi ed as follows:
Default: Ado =0 => Normal algorithm.
Ac: Condenser high temperature alarm
If a probe is set as the condenser probe, the condenser temperature can be monitored to signal the high
temperature alarm, probably due to obstruction or fouling. If the condenser temperature is > Ac+ (AE/2),
the pre-alarm is signalled, displaying the alarm message cht. If in the pre-alarm situation, the condenser
temperature falls to < Ac, the pre-alarm is reset and the signal cht is cancelled. If the condenser temperature
increases to > Ac + AE, the alarm CHt is activated and the compressor is stopped. The alarm can only be
reset manually. In the event of a condenser probe fault, the alarm and pre-alarm are activated.
Note: if control with two compressor steps is selected (with or without rotation, H1= 12 or 13) the high
condenser temperature alarm acts on both steps.
Important:
1. if no condenser probe is selected, the condensing temperature alarm and pre-alarm are disabled.
2. the condenser fans can be controlled in on/off mode; for this function, refer to parameters F4 and F5.
Default: Ac=70.0 degrees.
AE: High condenser temperature alarm differential
This is the differential used for activation of the high condenser temperature alarm and control of the
condenser fans.
Default: AE=5.0.
Acd: Condenser high temperature alarm delay
The parameter Acd can be used to set a delay on the activation of the condenser high temperature
alarm. When the threshold Ac + AE is exceeded, the alarm delay timer is started. If, when the delay time
Acd has elapsed, the temperature is still above the threshold, the alarm CHt is activated.
Otherwise, if the temperature returns below the threshold, the timer is reset and the alarm CHt is not
displayed.
Default: Acd=0 => 0 minutes, immediate high condenser temperature alarm.
AF: Light sensor OFF time
Used to manage the light sensor, connected to a digital input, as:
AF= 0 sensor in the door stop
AF> 0 sensor inside the cold room or cabinet
When AF=0 the inside light is switched on when the sensor detects light, and is switched off when the
sensor detects darkness. The light is switched off for a minimum of 3 seconds, so as to avoid close
successive impulses of the light relay.
Note: the sensor must be positioned so as to detect darkness when the door is closed.
When AF>0, the inside light is switched on when the sensor detects light. After a time in seconds equal
to AF, the light is switched off for 5 seconds to check if the door has been closed. If darkness is detected,
the inside light remains OFF, but if light is detected, the inside light is switched back on (after a
minimum time of 3 seconds) and the same cycle starts again. Default: AF = 0.
ALF: Antifreeze alarm threshold
Defi nes the temperature value below which the antifreeze alarm is detected, with the message AFr.
The function is active if a probe has been set as an antifreeze probe, /A2, /A3 or /A4 = 4 and is delayed
by the time set for parameter AdF.
The antifreeze alarm stops the compressor and activates the alarm relay, if H1=0, 1, and has manual
reset.
The antifreeze alarm stops the compressor (stops cooling operation) and activates the alarm relay, if
‘H1’=0, 1 or ‘H5’=0, 1.
The alarm is reset manually or from the supervisor.
Note: if control with two compressor steps is selected (with or without rotation, H1 = 12 or 13) the
antifreeze alarm acts on both steps.
Default: ALF= -5.0.
AdF: Antifreeze alarm delay.
Sets the delay for detecting the antifreeze alarm.
Default: AdF= 1.
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