Ascon Tecnologic - Y39W Line - Operating Instructions - Pag. 9
5.7
Compressor Protection Function and
Delay at Power-ON
The instrument allows 2 time controls to manage the switch-
ing ON of the two control outputs
r1
and
r2
connected to the
request of the temperature controller.
The protection consists of preventing the outputs being
enabled (switched ON) during the delay times and therefore
that any activation occurs only after both the protection times
have elapsed.
These functions are set to avoid frequent and close starts of
the compressor(s) controlled by the instrument in refrigera-
tion applications or in any case they can be used to add a
time control on the outputs witch control the actuators.
First control (parameter
P.11
) foresees a delay to the
r1
output
activation while
P.21
delays tha
r2
activation(switch ON delay).
SP
Pr1
off
off
off
P.11
off
ON
ON
ON
Temp.
time
P.11
P.11
r.d1
r1
Example of
r1
output with cooling action.
The second control provides the
ot
output inhibition if, since
the output was deactivated, the times set at parameters
p.12
(for
r1
output) and
p.22
(for
r2
output) have not elapsed
(delay after switching-OFF).
SP1
r1
off
off
off
ON
ON
time
P.12
P.12
r.d1
P.12
ON
Pr1
Temp.
During the output inhibition phases the LED
OUT
(Cool
,
Heat or
Aux
if foreseen) blinks.
It is also possible to prevent activation of all the outputs after
the instrument is turned ON, for the time set at parameter
P.od
.
During the power ON delay, the display shows the label
od
alternated with the normal visualization.
All these functions are disabled if the relative parameters are
set to
OFF
(
oF
).
5.8
Defrost Control
The defrost control acts on the outputs configured as
r1
and
r2
, if configured for cooling actions, on the output configured
as df and on the outputs configured for Fans if connected to
a controller set for cooling action.
The type of defrost that the instrument must carry out is set
with parameter
d.dt
that can be programmed as:
EL
Not ventilated
, with
electrical heating
or by
stop-
ping compressor
: During defrost outputs
r1
and
r2
- configured for cooling operation - are deactivated,
df
output and
Fn
output are activated. Not using the
dF
output results in a compressor stop defrost with fans
not active;
Fn
Ventilated
, with
electrical heating
or by
stopping
compressor
: During defrost outputs
r1
and
r2
- con-
figured for cooling operation - are deactivated,
df
output is activated while
Fn
output is deactivated.
Not using the
dF
output results in a compressor stop
defrost with fans active;
no
Without compressor or fans output conditioning
:
during defrost, the control outputs
ot
and the Fanscon-
tinue operating while
df
output is enabled.
5.8.1 Automatic Defrosts Start
The automatic control of defrost occours by:
–
Interval times;
–
For continuous compressor operating time.
Interval time automatic defrosts
The automatic defrost is therefore obtained by setting, with
d.di
parameter, the time that must elapse between the end
of a defrost and the beginning of the next one.
Setting
d.di
=
oF
the automatoc defrosts are disabled.
Automatic defrosts by continuous compressor
operating tme
The instrument starts a defrost cycle when the compressor
is activated continuously for the
d.Cd
time.
This function is used because the continuous operation of
the compressor for a long period is normally a symptom of a
low heat exchange typically caused by ice on the evaporator.
By setting
d.Cd
=
oF
the function is disabled.
5.8.2 Manual Defrost
To start up a manual defrosting cycle, press the key / or
when configured with parameters
t.UF
,
t.fa
and
t.fb
=
2
.
When in normal mode, press the key programmed for the
manual defrost start and keep it pressed for about 5 s after
which, if the conditions are correct, the LED lights up and
the instrument carries out a defrosting cycle.
To stop a defrosting cycle, press the key during a defrost
cycle and keep it pressed for about 5 s.
5.8.3 Defrosts End
The duration of the defrost cycle is established by param-
eter
d.dE
. By setting
d.dE
=
oF
both automatic and manual
defrosts are disabled.
The defrost cycle in progress is signaled by the lighted LED.
5.9
Fans Control
The output configured as
Fn
can be used to control recircu-
lation fans inside the environment in which the temperature
is controlled.
Through the
r.FF
parameter it is possible to obtain the follow-
ing output operations:
0
Fans not connected to controllers. The output is always
activated regardless of the state of the controllers. Dur-
ing defrosts the output behaves as established by param-
eter
d.dt
(if =
EL
the output is deactivated; if =
Fn
/
no
the
output remains activate).
1
Fans connected to
r1
controller. The output is activated
when the controller output
r1
is activated, while it is deac-
tivated when the output
r1
is not. During defrosts the out-
put behaves as established by parameter
d.dt
(if =
EL
the
output is deactivated; if =
Fn
/
no
the output is activated).
2
Fans connected to
r2
controller. The output is activated
when the controller output
r2
is activated, while it is deac-
tivated when the output
r2
is not. During defrosts the out-
put behaves as established by parameter
d.dt
(if =
EL
the
output is deactivated; if =
Fn
/
no
the output is activated).
3
Fans connected to both controllers. The output is activat-
ed when at least one of the control outputs is active while
it is deactivated when both outputs are disabled. During
