Ascon Tecnologic - Y39H Line - Operating Instructions - Pag. 8
ditions will always remain OFF.
On the other hand, by programming
r.t1
to any value and
r.t2
=
of
, the
ot
output in probe error conditions will always
remain ON.
5.6
Humidity controller
5.6.1 ON/Off humidity control
(
r.ud
=
u
or
d
)
The instrument humidity control mode is of the ON/OFF
type and acts on the outputs configured as
rh
and
hu
as a
function of the humidity measurement, the
SPh
Set Point,
the intervention differential
r.dh
and the
r.ud
operation mode.
With regard to the operating mode programmed with param-
eter
r.ud
, the differential is automatically considered by the
controller with positive values for a
Dehumidification
control
(
r.ud
=
d
) or with negative values for
Humidification
control
(
r.ud
=
u
).
r.ud
=
d
OUT
rh
SPh
Hum.
r.dh
time
r.ud
=
u
SPh
r.dh
OUT
rh
time
Ph
Hum.
Ph
off
off
ON
ON
ON
off
off
ON
ON
ON
5.6.2 ON Humidity controller with neutral zone
(
r.ud
=
nr
)
If the
r.ud
=
nr
parameter is programmed, the output con-
figured as
rh
operates with a
Dehumidification
action (such
as
r.ud
=
d
) and it is possible to use the output configured
as
hu
which operates with a
Humidification
action. Also in
this case, the differential is automatically considered by the
controller with positive values for a
Dehumidification
control
or with negative values for
Humidification
control.
r.dh
r.dh
SPh
Humidity
time
Oututs
hu
rh
off
off
off
ON
ON
ON
r.ud
=
nr
Ph
When the controller requests the activation of the
rh
output, it
is possible to arrange that the output is switched ON and OFF
cyclically according to the times programmed in parameter
r.h1
(activation time) and
r.h2
(deactivation time).
Upon the occurrence of an activation request by the humidity
controller, the instrument activates the
rh
output for the time
r.h1
, then deactivates it for the time
r.h2
and so on until the
Set Point is reached.
By programming
r.h1
=
of
the
rh
output in the event of a
request from the humidity controller will always remain OFF.
By programming, instead,
r.h1
=
any value
and
r.h2
=
of
,
the
rh
output in the event of a request from the humidity
controller will always remain ON.
This function can be especially useful in the case of humidifi-
cation action to modulate the actuator (motor or water injec-
tion solenoid valve).
5.7
Compressor Protection function and
Delay at Power-ON
The compressor protection functions performed by the in-
strument are studied to avoid frequent and close compressor
starts driven by the instrument in refrigeration applications
and in any case can be used to add a time control on the
output intended for controlling the temperature actuator.
This function provides
2
time controls. These control func-
tions manage the switching ON of the output configured
as
ot
associated with the temperature control request (not
operating in PID control).
The protection consists of preventing the output being
switched ON during the protection times and therefore that
any activation occurs only after all the times have elapsed.
First control (parameter
P.t1
) foresees a delay to the
ot
out-
put activation (switching ON delay).
SPt
Pt
off
off
off
P.t1
off
ON
ON
ON
Temp.
time
P.t1
P.t1
r.d
Out
(
ot
)
Second control (parameter
P.t2
) inhibits the activation of
ot
output by a time delay (
P.t2
) that starts when the output is
turned OFF (delay after switching-OFF).
SPt
Out
(
ot
)
off
off
off
ON
ON
time
P.t2
P.t2
r.d
P.t2
ON
Pt
Temp.
During the output inhibition phases caused by the protections,
the OUT LED blinks.
It is also possible to prevent activation of all the outputs after the
instrument is turned ON for the time set with parameter
P.od
.
During the power ON delay phase, the display shows the
indication
od
alternated with the normal visualization.
All these functions are disabled if the relative parameters are
set to
Off
(
oF
).
5.8
Alarm functions
The alarm conditions of the instrument are:
–
Probe errors:
E1
,
-E1
,
E2
,
-E2
,
E3
,
-E3
;
–
Temperature alarms:
Hit
and
Lot
;
–
Humidity alarms:
Hih
and
Loh
;
–
External alarm:
AL
;
–
Open door alarm:
oP
.
The instrument alarm functions act on the alarm LED
, on
internal buzzer (if present and programmed by parameter
o.bu
) and on the desired output, if configured with param-
eters
o.o1
,
o.o2
or
o.o3
according to the parameters set.
All alarm conditions are pointed out lighting up the
LED,
while the silenced or stored alarms are shown with the flash-
ing
LED.
The buzzer (when present) can e set to point out the alarm
conditions (
o.bu
=
1
or
3
) and operates as a silenceable
aòarm. is activated in alarm condition and can be manually
disabled pressing any instrument key (alarm silencing). This
means that, when the buzzer is acivated by an alarm status,