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24
operation manual
temperature contoller ELTC-MV2
BU 123
Revision 1
SLIDING SETPOINT
A sliding setpoint is always used when the temperature in
control circuit 1 is to be controlled depending on the tem-
perature in control circuit 2. The setpoint of control circuit 1
(w
1
) can be greater, less than or equal to the actual value of
control circuit 2 (x
2
). In order to accomplish this, a temperature
deviation w
2
is set on the controller of control circuit 1, which
is offset against the actuavl value x
2
.
Sliding setpoint 2-point
The actual value x
1
is recorded via a temperature sensor or a
standard signal and converted into a digital signal. Before this
signal is sent to the controller, the actual value is corrected.
The corrected actual value is shown on the display (P01).
The actual value x
2
is recorded via a temperature sensor or a
standard signal and converted into a digital signal. Before this
signal is sent to the controller, the actual value is corrected.
The corrected actual value is shown on the display (P02).
The temperature deviation w
2
is set on the controller and is
used to calculate the sliding setpoint w1.
The sliding setpoint w
1
= x
2
+ w
2
, is calculated in the control-
ler and shown on the display.
A hysteresis h can be set on the controller.
The control difference x
d
= (w
1
- h) -x
1
is formed in the cont-
roller.
Hybrid relay K1 (2-point)
If the control difference is x
d
< 0 , the hybrid relay opens.
If the control difference is x
d
≥ 0 , the hybrid relay closes.
Control of an external SSR relay (2-point)
The external SSR relay is switched via a voltage signal from the
controller.
If the control difference is x
d
< 0 , a 0/2V signal is sent to the
output and the SSR relay switches off.
If the control difference is x
d
≥ 0 , a 10V signal is given to the
output and the SSR relay switches on.
Ansteuerung eines externen Leistungsschützes
(2-Punkt)
If the control difference is x
d
< 0 , the safety relay opens and
the external power contactor switches off.
If the control difference is x
d
≥ 0 , the safety relay closes and
the external power contactor switches on.
Structure switch settings
No. description
selection option
S01
Selection actual
value 1 (X1)
[1] = Pt100, 3-wire (AE1)
2 = Pt100, 2-wire (AE1)
3 = thermocouple type J (AE1)
4 = thermocouple type K (AE1)
5 = voltage input (AE3)
6 = current input (AE3)
S02
Selection actual
value 2 (X2)
[1] = Pt100, 3-wire (AE2)
2 = Pt100, 2-wire (AE2)
3 = thermocouple type J (AE2)
4 = thermocouple type K (AE2)
5 = voltage input (AE4)
6 = current input (AE4)
S03 Select setpoint W
4 = Sliding setpoint (W2+X2)
S04
Selection of output
function controller
[1] = two-point control
S05
Selection switching
output
[1] = internal hybrid relay with
soft start
2 = external power contactor
3 = analog output clocked
Parameters used
No. description
factory
setting
Own
setting
P01
Input variable
1 (X1)
Display only
P02
Input variable
2 (X2)
Display only
P03
Reference variable W
Display only
P04
Current display
Display only
P11
Switching hysteresis 1
2
P12
min. standstill time K1
0
P15
Sensor correction 1
0
P16 Over temperature alarm 1
999
P17
Low temperature alarm 1
-99
P18
Lower analog scaling value
(0/2V, 0/4mA)
0
P19
Upper analog scaling value
(10V, 20mA)
100
P20
Control setpoint
2 (= W2)
5
P23 Largest settable setpoint 2
950
P24 Smallest settable setpoint 2
-50
P25
Sensor correction
2
0
P26 Over temperature alarm 2
999
P27
Low temperature alarm
2
-99
P28
Power monitoring
load output
0
P75
Low level mode analog inputs/
outputs
0
