= 11
- Selecting the active set point (SP/SP2) and heating/cooling
control mode with contact normally open: on closing the digital
input (and after the “i.ti” time) the temperature set point “SP2” with
cooling action is activated. When instead the input is open the set
point “SP” with heating action is active.
= -1, -2, -3, -4, -5, -6, -7, -8, -9, -10
- Like “i.Fi” with positive values
but with function logic reversed (contact normally closed)
4.4 - OUTPUTS AND BUZZER CONFIGURATION
The instrument outputs can be configured by the relative
parameters
“o.o1” , “o.o2”.
The outputs can be configured for the following functions:
= ot
- to control the compressor or however, the temperature
control device
= dF
- to control the defrosting device
= Fn
- to control the fans
= Au
- to control the auxiliary device
= At
- to control a silenceable alarm device through a contact that
is normally open, and then closed when the alarm sounds
= AL
- to control an alarm that cannot be silenced through a
contact that is normally open and closed when the alarm sounds.
= An
- to control an alarm with a memory function through a
contact that is normally open and closed when the alarm sounds.
= -At
- to control a silenceable alarm device through a contact that
is normally closed, and then open when the alarm sounds.
= -AL
- control an alarm that cannot be silenced through a contact
that is normally closed and open when the alarm sounds.
= -An
- to control an alarm with a memory function through a
contact that is normally closed and open when the alarm sounds
(see alarm memory).
= on
- Output on when the instrument is in on state. This mode can
be used to control lights, non-misting resistance on room door or
other utilities
= oF
- Disabled output
The function carried out for auxiliary output (par. desired output =
Au) is defined by the parameter
“o.Fo”
and the function is
conditioned by the time set in parameter
“o.tu”.
The parameter “o.Fo” can be configured for the following functions:
= oF
- Auxiliary output not active
= 1
- Temperature control output delayed with contact normally
open: the auxiliary output is activated with delay that can be set on
the parameter "o.tu" compared to the output configured as ot. The
output is then turned off at the same time as the ot output is
disabled. This function mode can be used as a command for a
second compressor or for all other working utilities according to the
same ot output conditions, but which must be delayed after the
start up of the compressor to avoid excess electricity absorption.
= 2
- Activation by front key (U or DOWN/AUX) or by digital input
with contact normally open: the output is activated by pressing the
keys U or DOWN/AUX suitably configured (“t.UF” or “t.Fb” = 1) or
via activation of the digital input if suitably configured (“i.Fi”=7).
These commands have a bi-stable function, Which means that
when first pressed, the output key is activated while the second is
disabled. In this mode, the AUX output can be turned off
automatically after a certain time that can be set on the parameter
"o.tu". With "o.tu" = oF the output is activated and deactivated only
manually, using the key (U or DOWN/AUX) or via the digital input.
Differently, the output, once activated, is turned off automatically
after the set time. This function can be used, for example, as a cell
light command, for non-misting resistance or other utilities.
= 3
- Light output managed by Active set point ( "economy"
function).
This output will be on in “normal” mode (Set Point "SP" active) and
off in economy mode operation (Set Point "SP2" active).
= 4
- Internal Light output managed by digital input. This output will
be on when door is opened (“i.Fi”= 5, 6).
The internal buzzer (if present) can be configured by par.
“o.bu”
for the following functions:
oF
= Buzzer always disable
1
= Buzzer signal active alarms only
2
= Buzzer signal key pressed only (no alarm)
3
= Buzzer signal active alarms and key pressed
4.5 - ACTIVE SET POINT SELECTION
The instrument allows up to 2 different Set points to be pre-set
(
“SP”
and
“SP2”
) and then to choose which one to make active.
This function can be used if it is necessary to switch two different
function temperatures (e.g. day and night or positive and negative
etc).
The active set point can be selected:
- Using the parameter
“S.SA”
- using the key U if the parameter
"t.UF"
= 3.
- Using the key DOWN/AUX if the parameter
"t.Fb"
= 3.
- Using the digital input if the parameter.
“i.Fi”
= 8 or 11
The selection of the Set point active can be also combined to the
function of switch off Auxiliary output if used as light ("o.Fo" = 3)
and to Heating/Cooling change action by digital input ("i.Fi"=11).
The Set points "SP" and "SP2" can be set with a value between
the programmed value in parameter.
“S.LS”
and the programmed
value in parameter
“S.HS”.
Note:
in the examples that follow, the Set point is generally
indicated as "SP", how when operating the instrument will work
according to the Set point selected as active.
4.6 - TEMPERATURE CONTROL
The regulation of the instrument is ON/OFF and acts on the output
configured as “ot” depending on the measuring of probe Pr1, of the
active Set Point
“SP”
(or “SP2”)
, the intervention differential
“r.d”
and the function mode
“r.HC”
.
Depending on the function mode programmed on the parameter
“r.HC” the differential is automatically considered by the regulator
with positive values for a Refrigeration control (“r.HC”=C) or with
negative values for a heating control (“r.HC”=H).
SP
off
ON
r.HC=H
time
r.d
SP
Temp.
r.d
time
r.HC=C
ON
ON
ON
ON
ON
off
off
off
Pr1
Pr1
Temp.
Out
(ot)
(ot)
Out
In the event of probe error, it is possible to set the instrument so
that that the output continues to work in cycles according to the
times programmed in the parameter
“r.t1”
(activation time) and
“r.t2”
(deactivation time).
If an error occurs on the probe the instrument activates the output
for the time “r.t1”, then deactivates it for the time “r.t2” and so on
whilst the error remains.
Programming “r.t1” = oF the output in probe error condition will
remain switched off.
Programming instead “r.t1” to any value and “r.t2” = oF the output
in probe error condition will remain switched on.
Remember that the temperature regulation function can be
conditioned by the “Continuous Cycle”, “Compressor Protection
and output delay at power-on”, “Defrost”, “Door open” and “external
alarm with outputs disable” functions.
4.7 - COMPRESSOR PROTECTION FUNCTION AND DELAY AT
POWER-ON
The function “Compressor Protection” aims to avoid close start ups
of the compressor controlled by the instrument in cooling
applications.
This function foresees 3 time controls on the switching on of the
output configured as “ot” associated with the temperature
regulation request.
The protection consists of preventing the output being switched on
during the times set in the parameters
“P.P1”, “P.P2” and “P.P3”
and therefore that any activation occurs only after all the times has
finished.
First control (par.
“P.P1”
) foresees a delay to the output activation
(switching-on delay).
ASCON TECNOLOGIC - Z31Y
- OPERATING INSTRUCTIONS - Vr. 02 - 04/12 - ISTR-MZ31YENG02 - PAG. 5
