Carel Heos, User Manual

Page: 19 / 60

19
ENG
Heos +0300078EN - rel. 1.6 - 23.11.2017
Functions available for the digital inputs
For each function, there is a confi guration screen used to associate it
with an available digital input. The same screen is used to select the input
confi guration (normally open or normally closed). The status (Open or
Closed) displayed is the eff ective position of the input, while the function
is associated with the selected logic. When the input is in the physical
status specifi ed as “normal” in the logic, the function is “Not active”, when
the input is in the opposite physical status, the corresponding function
is “Active”.
List of selectable functions
Parameter Description
/b1 Remote alarm
/b2 Delayed remote alarm
/b3 Enable defrost
/b4 Start network defrost
/b5 Door switch
/b6 Remote ON/OFF
/b7 Curtain/light switch - day/night
/b8 Continuous cycle
/b9 Cold room maintenance
/bA Showcase cleaning
/bb Inverter alarm
/bC Lights
A9 Virtual input
/bE Compressor 1 alarm
/bF Compressor 2 alarm
/bG Compressor 3 alarm
/bH Compressor 4 alarm
/bI Compressor 5 alarm
/bl Select dual temperature
Remote alarm (immediate)
Activation of the input causes:
•
alarm message shown on the display
•
activation of the buzzer
•
activation of the alarm relays (if confi gured, see digital outputs);
•
deactivation of the compressor.
Note: When the compressor is shut down due to a remote alarm
the minimum compressor ON time (parameter c3) is ignored.
Remote alarm with activation delay
Operation of this alarm depends on the setting of parameter A7 (delay
time for delayed remote alarm):
A7=0: signal only alarm on the display, normal operation of the controller
is not aff ected (default);
A7≠0: alarm similar to the remote alarm (immediate), activation is
delayed by the time set for A7.
Enable defrost
Used to disable any defrost calls. When the contact is open, all defrost
calls are ignored. Parameter d5 can be used to delay activation.
Start network defrost
Closing the digital contact starts the defrost, if enabled. In the event of
Master/Slave network connection, if the controller is the Master, the
defrost will be a network defrost (i.e. will also involve all the Slaves), while
if it is a Slave, it will only be a local defrost. The defrost digital input can
be used eff ectively to perform real time defrosts. Simply connect a timer
to the multifunction digital input on the Master and use d5 to delay the
defrosts on the various Slaves and thus avoid current overloads.
Door switch
With the door open (switch active) the following occur:
•
Lights on
•
Fans off
•
The delayed alarm counter starts (parameter d8)
•
The message “DOR” is shown on the PLD display
For stand-alone evaporator units:
•
Compressor off (without deactivation ramp, cooling demand is not
reset, but continues to be calculated)
For multi-evaporator units:
•
Compressor cooling demand continues to be calculated, however
the component relating to the unit with the door open is reset
•
Expansion valve closed
When the door is closed:
•
Lights off
•
Fans on
For stand-alone evaporator units:
•
The compressor is restarted as normal
For multi-evaporator units:
•
The component of demand relating to the unit whose door was
open is used again in the calculation
•
The expansion valve resumes operation (pre-positioning as at start-up)
Note:
•
when resuming control, the compressor protection times are observed;
•
if the door remains open for a time greater than the value set for
parameter d8, control is resumed in any case. The light remains on, the
buzzer and the alarm relay are activated, and the temperature alarms
are enabled, with the delay Ad.
Par. Description Def Min Max UOM
d8 High temperature alarm bypass time after
defrost and door open 30 1 240 min
Remote ON/OFF
Switches the controller off via the digital input. The PLD displays the
value measured by the selected probe (parameter /t2) alternating with
the message OFF; switch ON commands from the keypad or supervisor
are ignored.
Note:
•
if more than one input is confi gured as the remote ON/OFF, the off
status of one any of these switches the controller OFF;
•
the OFF control from digital input has priority over the keypad and the
supervisor;
•
if the controller remains OFF for longer than the value set for basic
parameter (time between consecutive defrosts), when the controller is
switched back on a defrost is performed.
Curtain/light switch
The curtain switch is used to control night/day status via a digital input.
When the switch is active (open if NC, closed if NO), the status is set to
NIGHT, when the switch is not active, the status is DAY.
•
During Night status, the night-time set point Stn is used for control,
calculated based on the set point St plus the off set defi ned by parameter
r4 (Stn = St + r4). If r4 is negative, during Night status the eff ective set
point is decreased from the Day set point.
•
In addition, if necessary the control probe is changed based on the
setting of parameter r6 (0 = virtual probe, 1= intake probe); the light is
switched off .
•
During Day status: normal operation resumes, set point = St, the virtual
probe used as the control probe; the light output is activated.