46
Fig. 7.m
ENGLISH
ir33 +030220441 - rel. 2.0 - 01.05.2006
To stop the reading from fl ashing, close the door. When the door is closed, the controller returns to
normal operation, switching off the light and enabling the temperature alarm after the delay time d8.
The compressor is re-started observing any protection times selected (see the C parameters).
Case 2: door opened with light ON:
SAssuming the user enters the cold room, turning on the light before entering, closing the door behind
him, and then exits the room, closing the door a second time. When the door is opened:
• the compressor the evaporator fans are switched off (to stop the fans only, set parameter A4=9);
• the light stays on (only in the models fi tted with an auxiliary relay programmed as the light output);
• the reading displayed and the icon fl ash;
• the temperature alarms are disabled
When the door is closed the fi rst time, the controller maintains the previous situation. When the door is
closed the second time, the controller returns to normal operation, switching off the light and enabling
the temperature alarm after the delay time d8. The compressor is re-started, observing any protection
times selected (see the C parameters).
If, after opening, the door remains open for a time longer than d8, the controller returns to normal
operation:
• compressor and fan ON, if requested;
• light OFF;
• the reading fl ashes;
• the buzzer and the alarm relay are activated;
• the temperature alarms are enabled;
• when the door closes the temperature alarm delay d8 is not set.
If, after being closed for the fi rst time, the door remains closed for longer than time d8, or if the light is
switched off manually, the controller restarts normal operation:
• compressor and fan ON, if requested;
• light OFF;
• the temperature alarms are enabled;
• the temperature alarm delay d8 is set.
If, after the door is closed for the fi rst time, the light is switched off manually, the controller resumes
normal operation.
Note:
1. if the light was previously switched on manually, when the door is closed for the second time, it is
automatically switched off;
2. if more than one digital input is confi gured as the door switch, the door open status will be
considered when at least one of the inputs is open;
3. if control with two compressor steps is selected (with or without rotation, H1, H5 = 12 or 13),
opening the door deactivates both steps.
Warning: even when the fan is managed by the fan controller (see the F parameters), the fans are
forced to stop when the door is open. This algorithm resolves any problems relating to faults or
malfunctions of the “door switch”.
A4 =6 Remote ON/OFF
The digital input can also be programmed as a remote ON/OFF switch. When the contact is closed, the
controller is ON.
When the controller is OFF:
• the temperature is displayed alternating with the message OFF;
• the internal timer for parameter dI is updated. If dI expires when the unit is OFF, a defrost is performed
when the unit is switched on again;
• the auxiliary relay set as AUX or LIGHT remains active;
• the buzzer and the alarm relay are de-activated;
• the controller does not perform the control functions, defrosts, continuous cycle, signal the
temperature alarms and all other functions;
• the compressor protection times are observed;
• when the instrument is switched back on, all the functions are re-activated, with the exception of
defrost on start-up, compressor and fan delay on start-up.
Contact closed => ON.
The ON/OFF from external digital input has priority over the keypad and the supervisor.
If A4=6, A5=6, the controller is ON with all the contacts closed
Note:
• if more than one digital input is confi gured as the remote ON/OFF, the OFF status occurs when at least
one of the inputs is open;
• if control with two compressor steps is selected (with or without rotation, H1, H5 = 12 or 13), the OFF
status deactivates both steps.
A4 =7 Curtain switch
If the input is selected as a curtain switch, the controller modifi es the set point when the contact closes,
adding the value of parameter r4; the new value is then used for all the functions relating to the set point
(e.g. relative high and low temperature alarms, control with dead band, control with two compressor
steps, etc.).
When r4=3.0 (default value), the set point is increased by 3 degrees from the value used when the
curtain is open.
Contact closed => curtain lowered.
If one of the auxiliary outputs is used to manage the light, lowering the curtain automatically switches the
light off, while raising it switches the light on.
Note: if more than one digital input is confi gured as a curtain switch, the curtain open status occurs
when at least one of the inputs is open.
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