Technical Manual TAR Cold Storage Controller TAR 1380 page 3
Display & Sensors
All temperature values can be displayed in °C or
°F with a resolution of 0,1K (0,2°F). Parameter
P21 allows toggling between these two display
modes and to change the type of sensor.
TF201, TF 202 (PTC) as well as TF501 (Pt1000)
sensors can be used, but note that this results in
differenttemperatureranges.Ifnotrequired,sen-
sor 2 (Evap. Limit Sensor) can be disabled.
Temperature Control
The controller compares the actual room tempe-
rature (P01) with the control setpoint (P03) and
activatesthecooling relaywhich isable toswitch
solenoid valves or compressors.
The switching hysteresis (differential, P09) is ad-
justableto preventthesystemfromshort cycling.
An idle time (P11) prevents a compressor from
switching ON again immediately.
Setpoint range
P07/P08 limits the setpoint range to prevent the
end-user from entering a critical value.
Switching mode of cooling relay
The switching behavior of the cooling relay
(= cooling mode) is defined by parameter P10.
1= refrigeration
2= heating
2. Setpoint / 'Night'-setpoint / day-night-shift
To economize energy, e.g. at night, the unit can
work with a second setpoint (P04). This setpoint
canbeactivatedby theinternaltime-switch(P05/
P06).
Temperature alarm
Analarmrelay isavailable for warningpurposes.
If the temperature measured by the control sen-
sor exceeds the range set with parameters P32/
P33 a delay timer (P31) starts. After this timer is
rundown,thealarmrelaywillbeactivated. P32is
located relative to setpoint P03, so P32 will be
shifted the same size the setpoint will be shifted.
Ifthe alarmmode P30is setto '4',the alarmrelay
can be reset while the temperature is located
within the alarm range.
If the temperature has left the range, P18 shows
the remaining time until an alarm occurs.
If the temperature comes back to the working
range, the relay will be reset automatically.
war
activated
de-activated
cold
setpoint
hysteresis
Alarm relay operation modes
With parameter P30 you select the alarm relay
mode:
0= Alarm relay active ON
1= Alarm relay active OFF
2/3= no function
4= Alarm relay can be reset while tempera-
ture is located within the alarm range.
Can be used to drive an external klaxon.
5= Continuous ON of alarm relay if control
setpoint 2 is activated. Alarm messages
will be forwarded by alarm-LED only.
Function to switch light by time control.
Real time clock
The TARCold StorageController containsa real
time clock which allows you to initiate four (8 with
AZV) defrost events a day.
The timer has a power backup for about 10 days
in case of power failure.
The clock time can be set with parameters P34
and P35. The defrost times are set with P24 thru
P27in10minuteincrementsina24hour(military)
format. Example: 13.20 = 01:20 p.m.
Switch times can be de-activated by setting to
'oFF'.
The second setpoint switch is made with P05/
P06.
Becausethedisplayhasonlythreedigits,thetime
value comes in the following format:
Defrost
One relay output is able to control a defrost
device.Thereis noneed for externalinterlocking
thedefrostoutputwiththecoolingoutputsincethe
temperature controller is disabled while defrost.
Defrost Initiation
#
by internal timer, four events available
(P24 till P27)
#manually (P37).
ForinformationthereisparameterP15sho-
wing the remaining time of the existing
defrost event until termination by time.
Defrost Modes
With P23 a defrost mode can be selected.
1 = Heater or Airflow Defrost
StartingofdefrosteventswitchesON defrost
relay (i.e heater ON) and switches OFF
the cooling.
2 = Hot Gas Defrost
StartingofdefrosteventswitchesON defrost
relay (i.e. bypass-valve open) and switches
ON cooling relay (i.e. solenoid valve open).
3 = Heater or Free Airflow Defrost + (AZV)
Relay characteristic like = 1.
Addtional generated defrost events.
4 = Hot Gas Defrost + (AZV)
Relay characteristic like = 2.
Addtional generated defrost events.
Manual Defrost
#Parameter P37 allows starting a defrost
cycle with the "!" key, unless the sensor is
setpoint
cold
hysteresis
warm
de-activ.
activated
already above termination temp. or
#While the actual temperature can be read on
display, a defrost event can be initiated by
holding the "!" key for more than 2 sec.
Defrost Termination
#Thermal termination.
Defrosting will be terminated whenever the
evaporatorsensortemperature(P02)exceeds
thetemperaturelimitsetwithparameterP22.
#Termination by (safety) time.
The time set with parameter P28 is the
maximumtimeadefrostcyclecanlastbefore
it is terminated automatically.
#Manual termination.
With parameter P37 you can terminate a
defrost cycle by pressing """ key.
or
While the actual temperature (P01) can be
read on the display, a defrost event can be
terminated by holding """ key for more than
2 seconds.
#If the defrost limit sensor is interrupted, the
defrost event will be stopped immediately.
After the defrost event is terminated, the begin of
the cooling function is delayed by (P29). This
preventsfreezingwaterdropsontheevaporators
surface. P16 showstheremaining timeuntil coo-
ling starts again.
Evaporator Fan Control
Three different modes of fan operation can be
selected with parameter P13.
Fan Modes
1 = Fan runs if compressor output is on.
AfterdefrostingthefanoutputisOFFuntilthe
Fan Delay Time (P14) is run down.
2 = Fan runs continously, except during defrost
and Fan Delay Time (P14) after defrost.
Thermostatic fan delay: The fan stops if the
temperature measured with the evaporator
sensor exceeds P12. If this function is
not desired, P12 can be set to its upper
border to make it inefficient.
3 = Fan runs if the compressor output is on, and
during defrost.
The temporal fan delay must be set to "0".
The end of a defrost cycle
A temporal fan-ON delay is active after a defrost
event (P14).
Athermostaticdelayisalwaysactive,thatmeans
the fan starts only if the temperature measured
withtheevaporator(limit-) sensoris3Kbelowthe
fan operation threshold (P12).
Ifthis functionisnotdesired,P12canbe settoits
upper border to make it inefficient.
While drain time (P29) the fan remains stopped.
(P17) informs about the remaining time until the
fan starts again.
Practical conditions
The fan is always run from the N/O contact
of the fan relay.
If you want to realize a thermostatic delay, select
fan mode 2and adjust setpoint P12.
Ifyouwanttorealizeathermostaticdelayandfree
airdefrost,pleaserealizeaparallel connectionof
fan relay and defrost relay.
Functional Description
3rd Position=
minutes x 10
1st. and 2nd
Position = hours
