Ascon tecnologic e34B User Manual

Ascon Tecnologic - e34B - OPERATING INSTRUCTIONS - PAG. 9
The time protections described in the next paragraph
(PP1/PP2/PP3) always work on the ot configured output.
In the event of a probe error, it is possible to set the
instrument so that the ot output continues working in
cycles according to the times programmed with param-
eter rt1 (activation time) and rt2 (deactivation time).
If a Pr1 probe error occurs, the instrument activates
the ot output for rt1 time, then disables it for rt2
time and so on until the error persists.
By programming rt1 = oF the output, in probe error
condition, will always be OFF. On the contrary, pro-
gramming rt1 to any value and rt2 = oF the output,
in probe error conditions, will always be ON.
Remember that the operation of the temperature con-
troller can be conditioned by the following functions:
Compressor protection function and power-on delay,
Defrost, Open door and External alarm with output
block from digital input.
5.7 Compressor protection function and
power-on delay
The “Compressor Protection” function aims to avoid repeated
compressor start-ups controlled by the instrument in cooling
applications or otherwise can be used to add a timed control
on the actuator control output.
This function foresees 3 time controls on the switching ON of
the output configured as ot. The protection consists of pre-
venting the ot output being switched ON during the times set
with parameters PP1, pP2 and PP3 and therefore that any
activation occurs only after all times are elapsed.
1 First control (parameter PP1) foresees a delay to ot out-
put activation (switching-ON delay).
SP
Temp.
time
offoff off off
ON
ON
rd
PP1
PP1
ot
ON
Pr1
Output
PP1 PP1
2 Second control (parameter PP2) foresees an inhibition to
the activation of the output by a time delay that starts when
the output is turning OFF (delay after switching-OFF).
offoff off
ON
SP
time
rd
PP2
ON ON
Temp.
ot
Pr1
Output
PP2 PP2 PP2
3 Third control (parameter PP3) foresees an inhibition to
the activation of the output by a time delay that starts
when the output was turned ON last time (delay between
two switching-ON).
offoffoff
ON
SP
time
rd
PP3
PP3 PP3
PP3
ON ON
Temp.
ot
Pr1
Output
During output inhibition the LED OUT (Cool or Heat ) blinks.
It is also possible to prevent all outputs activation after the
instrument is turned ON, for the time set in the parameter Pod.
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 Defrost control
The defrost control acts on the outputs configured as ot, dF ad
dH. The type of defrost is set by the parameter ddt:
EL With electrical heating (or By stopping compres-
sor): while defrosting, the output ot is deactivated
while the output dF is enabled. The defrost will be by
Stopping compressor if not using the dF output;
in With hot gas or Cycle inversion: while defrosting
both the ot and dF outputs are enabled:
no Without compressor output conditioning: while de-
frosting, the output ot continuous to operate in order to
control thetemperature, also the output dF is enabled;
Et With electrical heating and defrosting temperature
control: during defrosting, the output ot is deactivated
while the output dF operate as evaporator temperature
control. In this mode the defrost lenght is by time-out
(time ddE). During the defrost, the dF output behaves
as an heating mode control with Set Point = dtE, dif-
ferential fixed at 1°C and operates with the values of
the EP evaporator probe. In this functioning mode, if
the evaporator probe is not enabled or is in error, the
defrost behaves as with selection EL (therefore the
output dF during defrost must always be active).
The output configured as dH can be used to control
an additional defrosting resistance activated before
defrost for the time set at parameter ddP and can be
deactivated after defrost with a delay that can be set
with parameter dPd.
(dH)
dPd din
ddE
off
Compr.
(ot)
offoff
Defrost
(dF)
off
Start
defrost
End
defrost
dtdddp
ON/OFF #1
#1: ON if ddt =in,
OFF if ddt = EL
5.8.1 Starting automatic defrosts
The automatic control of defrost occours:
– By interval times (regular or dynamic);
– By Evaporator temperature;
– By continuous compressor running time.
In order to avoid unnecessary defrosting when the evapora-
tor temperature is high the dtS parameter allows to set the
temperature related to the evaporator probe (probe config-
ured as EP) under which defrosts are possible.
Therefore, in the modes indicated, if the temperature meas-
ured by the evaporator probe is higher than the temperature
set with dtS parameter, defrosts are inhibited.
Defrost by regular interval time
As an alternative to programmable defrosts, the instrument
allows to execute the defrosts at programmed interval time.
Through the ddC parameter, can be set the defrost interval
counting mode:
rt At real-time power-ON intervals. The ddi interval is
counted as the total ignition time of the instrument.
This mode is the one currently used in the refrigera-
tion systems.
ct At time intervals of the compressor operation. The
ddi interval is counted as the sum of the operating

Ascon tecnologic e34B Specifications

General

Brand	Ascon tecnologic
Model	e34B
Category	Temperature Controller
Language	English