Technical Manual Temperature-, Humidity-, Pressure-Controller TAR x260
Page 7
cold
w a r m
setpoint
hysteresis
s t a g e O F F
s t a g e O N
cold
warm
hysteresis
stage OFF
setpoint
stage ON
2 = Freezing (DF)
Used for temperature applications below
0°C. The load would be switched by the
NC-contact, this enables that the load will
be switched on permenantly in case of
mains loss or controller defect.
Note: not usable for relay 2 at type 1260.
3 = HT (Heating)
Usable for heating applications. Load
would be switched off in case of mains
fail or controller defect.
Use NO-Contact.
4 = Cycling
Quasi-Proportional Control with cycling
relay. Usable for heaters or certain valves.
Here a range will be defined within the relay
will cycle. The relay's ON/OFF ratio
(cycle ratio) depends on control deviation.
The period duration will be set by P40.
With P40=1 the period duration is
16 seconds, with P49=2 the duration is
32 seconds, and so on.
P16 defines the Xp-range where relay 1
cycles within.
The upper limit of this range is:
P03 (setp.1) - P12 (hyst.1).
The lower limit is built of:
P03 (setp.1) - P12 (hyst.1) - P16
If the signal reaches the hysteresis
range P12, relay 1 remains OFF
permanently, below the lower limit
relay 1 remains permanently ON
(e.g. for heating, humidifying).
P17 defines the Xp-range where
relay 2 cycles within.
The lower limit of this range is:
P04 (setp.2) + P13 (hyst.2).
The upper limit is built of:
P04 (setp.2) + P13 (hyst.2) + P17
Above the upper limit, relay 2
remains permanently ON (e.g. for
refrigeration, de-hu midifying),
below the lower limit relay 2
remains OFF.
Alarm relay characteristic
Parameter P09 defines if the alarm relay is
affected from the actual value P01 or P02 and
whether the alarm relay is activated (active) or
de-activated (passive) if an alarm occurs.
Minimium idle time
If a relay has been switched OFF, it can be
activated first after timer P15 is run down. If the
switching characteristic is set to 'cycling' this
function is de-activated.
Parameters P23 and P24 show the remaining
time until the relays will switch ON again.
Example for a cycling heater:
Switching char. ..... P07 = 4
Setpoint 1 ............. P03 = 8°C
Hyst. setpoint 1 .... P12 = 1K
P-range relay 1 ..... P16 = 4K
8°C = relay OFF permanently
7°C = relay OFF permanently
6°C = relay cycles, 25% ON,
75% OFF
5°C = relay cycles, 50% ON,
50% OFF
4°C = relay cycles, 75% ON,
25% OFF
3°C = relay ON permanently
Defrost Function
In operation mode 4 (P14=4) a simple defrost
function can be used. This function suppres-
ses (in adjustable intervals) the switch-on of
relay 1 to enable an air circulation defrost.
The parameters P20 and P21 have another
significance in this mode. P20 defines the
defrost cycle, P21 the defrost duration.
After power-on of the unit the defrost cycle time
(P20) runs down first, before a defrost can
start.
To prevent a temperature alarm while a defrost
event, P31 must be lengthened eventually.
A defrost can be started and stopped manually
while the actual value is being displayed, a
running defrost event is indicated by an LED
(see 'operating').
relay 1
durably ON
7
5
%
O
N
5
0
%
O
N
2
5
%
O
N
relay cycles
relay 1
durably OFF
P-range rel.2
P17
hysteresis P13
setpoint P04 (10°)
setpoint P03 (8°)
hysteresis P12
P-range rel.1
P16
relay cycles
relay 2
Durably OFF
2
5
%
O
N
5
0
%
O
N
7
5
%
O
N
relay 2
durably ON
Defrost Cycle
Defrost starts
Defrost ends
OFF
ON
Defrost-
Duration
Important !! -->
Please note the decreased lifetime of the relay contacts in
cycling operation. Please care for a suitable relief.
Cycle 16 sec.:
load current 0,8A res. --> 2 years
load current 1,2A res. --> 1 year
load current 1,9A res. --> 0,5 years
(Theoretical values according to the relays data sheet)
