Technical Manual TAR x700-2 page 3
Functional Description
Signal Input
The controller unit is able to work with the tempe-
rature sensor types TF 201 and TF 501 (Pt1000).
This must be preset by parameter P25.
Ranges:
P25 = 1 (TF 201).......-50...+100°C
P25 = 3 (TF 501/Pt1000).......-100...+300°C
Please note the specific temperature restric-
tions of the different sensor types (e.g.
-40...+80°C with standard-TF-types) and ask
for matching products if necessary.
Actual Value- and Status Display
Temperaturevaluescanbedisplayedin°Cor°F.This
will be preset together with the sensor type.
P01 shows the measured value of sensor 1.
If other parameters are selected, 4 minutes after
the last keypress the display switches back to P01
automatically. In operating mode 3+4, P02 shows
the measured value of sensor 2. In operating mode
'Differential control', P03 shows additionally the
differential value between sensor 1 and 2.
Display Correction
The Actual Value Display P01 can be calibrated by
P23, P02 can be calibrated by P24.
Operating Modes
The TAR controller knows 4 different operating
modes, which can be preset by P19:
P19 = 1: 3 Stages + Alarm.
In this mode
you realize a 3-
stage controller,
relay K4 works
as a closed cir-
cuit alarm relay,
sensor input 2 is
disabled.
The value of
sensor 1 will be
compared with
P04, P05 and
P06, the relays K1, K2 or K3 switch depending on
the deviation. P04 is always an absolute value, the
following setpoints can be either relative values or
absolute values (preset by P08).
Relative values = Stage switches in a specific
distance to the leading setpoint P04. If P04 will be
changed, the relative setpoints will be changed the
same amount.
P19 = 2 : 4-stage controller
Sensor input
2 is disabled
in this mode.
The value of
sensor 1 will be
compared with
P04, P05, P06
and P07, the
relays K1, K2,
K3 or K4 switch
depending on
the deviation.
Controlsetpoint1(P04)isalwaysanabsolutevalue,
the following setpoints can be either relative values
or absolute values (preset by P08).
P19 = 3 : Double 2-Stage Controller
Sensor 1 af-
fects on the
control set-
points P04/
P05 (= relays
K1/K2=control
circuit 1).
P04 is the lea-
dingsetpointof
control circuit
1, control set-
point 2 (P05)
can be either absolute or relative (P08). Sensor 2
affects on the control setpoints P06/P07 (= relays
K3-K4 = control circuit 2). P06 is the leading setpoint
of control circuit 2, P07 can be either absolute or
relative (P08).
P19 = 4 Differential Controller
Thecalculateddif-
ferential amount
from "sensor 1
minus sensor 2"
will be compared
with P04.
Relay K1 swit-
ches, if the pre-
set value P04 +
hysteresis P18
is reached. The
relay switches off
again, if the dif-
ferential amount
decreases and reaches P04. The stages 2 (relay
K2, P05, assigned to sensor 1) and 3 (relay K3,
P06, assigned to sensor 2), can work independly
as single stage controllers.
Relay K4 works as a closed circuit alarm relay.
Switching Hysteresis
With P18 you set a switching hysteresis, which
affects to all setpoints. The position of this hyste-
resis (above/below the setpoint) depends on the
selected switching characteristics (P10-P13) of
the single relays.
Setpoint Limits
To prevent that the final user adjusts the setpoints
to an inadmissible value, the setpoint range can be
limited by P16 and P17.
Real time clock
The integrated real time clock allows to change the
setpoints at specific times. The timer has a power
backup for about 10 days in case of power failure.
The time of the day and the date can be set with
parameters P35...P36.
Because the display has only three digits, the time
value comes in the following format:
Day-/Night Mode / Setpoint Offset
Initiation by real-time clock
With P14/P15 you can set a period of time within
all setpoints will be shifted by the amount of P09.
If not necessary, you can disable P14/P15 (display
shows "oFF").
Initiation by Digital Input
Digital Input OK 1 can also be programmed to
activate this offset (P29=1). An active 2nd setpoint
is indicated by a flashing decimal point.
Temperature Alarm
If the tempe-
rature value
measured with
sensor 1 ex-
ceeds the ran-
ge set by P27
and P28, the
alarm relay will
be activated
after the delay
timerP26isrun
down.
Parameter P21 shows the remaining time up to
an alarm.
P28 (lower limit) is an absolute value, P27 is always
a relative value in a distance to the actual setpoint
1 (P04 + potential shift).
3rd Position=
minutes x 10
1st and 2nd
Position=hours
Relay Switching Characteristic
The Switching Characteristic of the relay K1-K4 is
defined by the parameters P10...P13. The following
characteristics are possible:
1= Refrigeration (RF)
Used for standard applications (e.g.
temperatures above 0°C). The load would be
switched by the N/O-contact.
Actual value = setpoint + hysteresis: Relay on
2 = Freezing (FR)
The load would be switched by the N/C-
contact, this enables that the load will be
switched on permanently in case of mains
loss or controller defect.
Actual value = setpoint + hysteresis: Relay off
3 = Heating (HT)
Usable for heating applications. Load
would be switched off in case of mains
fail or controller defect.
Actual value = setpoint -hysteresis: Relay on
Minimum Idle-Time
If a load is switched off by a relay, this relay cannot
be switched on again before the time set with P20
is over. P20 affects all relay stages.
The indicator LED's of the single stages flashes
while this idle time runs.
The Minimum Idle-Time affects immediately after
power-on of the controller.
Digital Input
Digital input DI1 is normally connected to mains
voltage. If this voltage is interrupted, the function set
with P29 will be initiated after a time delay (P30).
P30 is adjustable within 0...99 minutes, but at '0' the
minimum delay is appr. 4 seconds.
P29=oFF Digital input DI/OK 1 is de-activated
P29=1 Control Setpoint 2 (night-setpoint) is
active. The setpoints increase/
decrease by the amount of P09.
P29=2 An external alarm is detected after
P30 is run down. LED 4 and the alarm
relay are activated after P26 has been
run down.
P29=3 Controller unit oFF. All control
functions will be disabled, the display
shows "oFF". This allows to switch off
the unit without an alarm message in
a network. Relays 1-3 are deactivated,
the alarm relay remains in a neutral
position.
Analogue output behaviour:
• Delivers 0V with op-mode
proportional (P34=1 or 3).
• Delivers 10V with op-mode
anti-proportional (P34 = 2 or 4)
P22 shows the remaining delay time of the digital
input.
Using the TAR 1700-2 this function must
bestartedbyopeninganexternal,potential
free contact connected to terminals 11/12.
Never connect mains voltage to these
terminals, danger of destruction! This
contact must be suitable for 5VDC/1mA.
