STORK TRONIC ST70-31.03 Quick start guide

ST70-31.03
Temperature controller
Order number 900380.004
Wiring diagram
Product description
The switching exits of the thermostatic controller can be programmed as
-two-point controller with alarm
-three-point controller
-two-stage controller
-controller with ramp profile.
The setpoint and all parameters of the controller are set on a three-field plastic foil keyboard.
Sensor: Pt100-3 wire
Range: -99...600◦C
Front size: 72mm x 36mm
Panel cut-out: 68.5mm x 28.5mm
Connector: screw terminal
1

2

Software .03
Adjustment options
Key UP
Pressing this key you can increase the parameter or parameter value or scroll the
parameter list.
Key DOWN
Pressing this key you can decrease the parameter or parameter value or scroll the
parameter list. At alarm the buzzer function can be switched off with this key.
Key 4: SET
While SET key is pressed, the setpoint is indicated.
In addition, the SET key is used for setting parameters
First control level:
Parameter setting of the control setpoint
If none of the keys is pressed, the display indicates the actual value of the temperature. Pressing
the SET key, the setpoint shows on the display.
If the setpoint is to be changed, the SET key is to be kept pressed while adjusting the setpoint with
the keys UP and DOWN.
Please note that the setpoint can only be changed within the set setpoint limits.
Para-
meter
Function description
Adjustment range
Standard
setting
Custom
setting
S1
Setpoint
P4...P5
0.0°C

Second control level (P parameters):
Setting of control parameters
Simultaneously pressing the UP and DOWN key for at least 4 seconds opens a parameter list
containing control parameters.
With the UP and DOWN keys the list can be scrolled in both directions.
Pressing the SET key will give you the value of the respective parameter. Pressing also the UP or
DOWN key at the same time the value can be adjusted.
Return to the initial position takes place automatically, if no key is pressed for 60 seconds.
Para-
meter
Function description
Adjustment range
Standard
setting
Custom
setting
P1
Setpoint 2 or
DeltaW
P4...P5
-99...+999 K
0,0°C
+10K
P2
Hysteresis contact K1
0.1... 99.9 K
1.0 K
P3
Hysteresis contact K2
0.1... 99.9 K
1.0 K
P4*
Control range limitation –
minimum setpoint
-99°C...P5
-99°C
P5*
Control range limitation –
maximum setpoint
P4...999°C
999°C
P6
Actual value correction
-10.0...+10.0 K
0.0 K
P11**
Relative or
absolute employment point of
the ramp phase
-99...99K
-99...999°C
10.0K
10.0°C
P12**
Ramp gradient
0.1...100K/min.
10.0K/min.
P19
Key-lock
0: no key-lock
1: key-lock
0
P30
Lower alarm value
-99...999°C/K
-10.0 K
P31
Upper alarm value
-99...999°C/K
+10.0 K
P32
Hysteresis alarm circuit,
symmetrical
0.1...99.9 K
1.0 K
* standard setting depends on sensor type
** parameter only available with activated ramp function

Parameter description:
P1: Setpoint / DeltaW for control circuit 2
Adjusting the setpoint of control circuit 2.
If A5=1, the setpoints for control circuit 1 and 2 are linked with one another via switching difference
DeltaW, which can be adjusted with P1. (operation with DeltaW)
The following applies: setpoint thermostat 2 = setpoint control circuit 1 + delta W2.
This difference can take positive or negative values. Thus, a leading or following contact can be
realised.
P2: Hysteresis contact K1
P3: Hysteresis contact K2
The hysteresis can be set symmetrically or one-sided at the setpoint (see A40, A41).
At one-sided setting, the hysteresis works downward with heating contact and upward with cooling
contact. At symmetrical hysteresis, half of the hysteresis’ value is effective below and half of the
value above the switching point (see fig. 1 and 2).
Fig. 1: Heating controller, one-sided hysteresis Fig. 2: Cooling controller, symmetrical
hysteresis
P4: Control range limitation – minimum setpoint
P5: Control range limitation – maximum setpoint
The adjustment range of the setpoint can be limited in both directions. This is to prevent the end
user of a unit from setting inadmissible or dangerous setpoints.
P6: Actual value correction
This parameter allows the correction of actual value deviations caused for example by sensor
tolerances or extremely long sensor lines. The regulation measure value is increased or decreased
by the here adjusted value.
P11: Employment point of the ramp phase
Before reaching the point of ramp employment the controller works at full heating/cooling power.
After reaching the point of ramp employment regulation to reach the setpoint is effected by help of
a ramp profile. The ramp is ascending at heating function with employment points below the
setpoint. At cooling function it is falling with employment points above the setpoint.
After the setpoint is reached, the ramp function becomes inactive, unless the temperature exceeds
the point of ramp employment again in either direction, due to external influences (see fig. 3+4).
Please note that the ramp function is deactivated, if the actual value is inside the ramp range
during switching-on.
Changes of ramp parameters are not considered once the ramp has started, but become effective
only thereafter. In the case of activated ramp function, there are two employment points for the
ramp possible (see parameter A6):

Fig. 3: relative values
The main setpoint S1 and the point of ramp
employment are linked as difference with one
another. This difference can take positive or
negative values, i.e. starting point for the
ramp can be above the setpoint at cooling
function or below the setpoint at heating
function, and automatically runs along with
adjustments of the desired value.
Fig. 4: absolute values
Main setpoint S1 and ramp employment point
are independent from each other
P12: Ramp gradient
The ramp gradient sets the degree applied to change the (internal) setpoint in a ramp phase.
P19: Key-lock
The key-lock allows blocking of the control keys. In locked condition parameter adjustments with
keys is not possible. At the attempt to adjust the parameters despite key-lock the message "==="
appears in the display.
P30: Lower alarm value
P31: Upper alarm value
The exit alarm is a boundary alarm or a range alarm with symmetrical hysteresis (see P32). Both at
the boundary alarm and the range alarm, limit values can be relative, i.e. going along with the
setpoint, or absolute, i.e. independent of the setpoint. The operation mode is set with parameter
A30. If, in case of boundary alarm and only one switching point is required the not used second
switching point should be adjusted to a value above or below the operating range of the controller.
Boundary alarm function (see fig. 5):
The alarm contact is closed if the process
temperature is above the upper or below the
lower boundary value.
Fig. 5: Boundary alarm, rel. boundaries
Range alarm function (see fig. 6):
Opposite switching behaviour to the boundary
value alarm. The alarm contact is closed if
the actual value remains between the
boundary values.
Fig 6: Range alarm, abs. boundaries
P32: Hysteresis alarm circuit
Hysteresis is set symmetrical at the adjusted limit value, i.e. half of the hysteresis’ value is effective
below and half of the value above the switching point

Third control level, (A parameters):
Setting of control parameters
Access to the third control level is granted when selecting the last P-parameter on the second
control level. Continue to press the UP key for approximately 10 seconds until “PA” appears.
Continue to press the UP key and additionally press the DOWN key for about 4 seconds and the
first A-parameter of the third control level is indicated.
With the keys UP and DOWN you can scroll the list in both directions. Pressing the SET key will
give you the value of the respective parameter. By pressing the UP or DOWN key at the same time
the value can be adjusted.
Return to the initial position takes place automatically, if no key is pressed for 60 seconds, or by
simultaneously pressing the UP and DOWN key for approx. 4 seconds.
Para-
meter
Function description
Adjustment range
Standard
setting
Custom
setting
A1
Switch mode contact K1
0: heating contact
1: cooling contact
0
A2
Switch mode contact K2
0: heating contact
1: cooling contact
1
A3
Function of contact K1 at
sensor error
0: relay off
1: relay on
0
A4
Function of contact K2 at
sensor error
0: relay off
1: relay on
0
A5
Selection setpoint 2 or
DeltaW
0: operation with setpoint 2
1: operation with DeltaW
1
A6
Control characteristics
0: no ramp function
2: relative ramp function
3: absolute ramp function
0
A8
Display mode
(all parameter indications
are presented in 0.1°K)
0: integrals, without leading zero
1: with decimals without leading zero 1
A9
Weighing factor
0.50 ... 1.50
1.00
A10*
Indication value for lower
value linear analogue input
-99...999
0.0
A11*
Indication value for upper
value linear analogue input
-99...999
100
A19
Parameter lock
0: no lock
1: A-parameter locked
2: A- and P-parameter locked
0
A20
Key acknowledgement
0:no
1:yes
1
A30
Function alarm exit
0:Boundary alarm, relative
1:Boundary alarm, absolute
2:Range alarm, relative
3:Range alarm, absolute
0
A31
Special function at
boundary or range alarm
0:no special function
1:flashing display
2:buzzer
3:flashing display and buzzer
4:like 3, buzzer can be cancelled
5:like 4, cancelled buzzer restarts
after 10 min.
6:like 4, cancelled buzzer restarts
after 30 min.
0

Para-
meter
Function description
Adjustment range
Standard
setting
Custom
setting
A32
Alarm delay after
“Power-on”
0...60 min.
0 min.
A40
Hysteresis mode
contact K1
0: symmetrically
1: one-sided
0
A41
Hysteresis mode
contact K2
0: symmetrically
1: one-sided
0
A50
Minimum action time
contact K1 ”On”
0...400 sec.
0.0 sec.
A51
Minimum action time
contact K1 ”Off”
0...400 sec.
0.0 sec.
A52
Minimum action time
contact K2 ”On”
0...400 sec.
0.0 sec.
A53
Minimum action time
contact K2 ”Off”
0...400 sec.
0.0 sec.
A54
Delay after “Power-on”
0...400 sec.
0.0 sec.
A55
Mutual delay of contacts
K1 and K2
0...400 sec.
0.0 sec.
A60
Sensor type
01: Thermo element type J
02: Thermo element type K
11: PT100 (2-Leiter)
12: PT100 (3-Leiter)
21: KTY81-121 (2-Leiter)
22: PT1000 (2-Leiter)
31: 2-10 V or 4-20 mA
32: 0-10 V or 0-20 mA
dependent
on
hardware
A70
Zeitkonstante Softwarefilter
0: 0.0 sec.
1: 0.8 sec.
2: 2.4 sec.
3: 6.0 sec.
4: 16.0 sec.
5: 38.6 sec.
6: 96.0 sec.
3
A80**
Temperature scale
0: Fahrenheit
1: Celsius
1
* parameter only available if there is a voltage/current input
** not available with voltage or current input

Parameter description:
The following values can change the equipment characteristics
and are therefore to be set with utmost care.
A1: Switch mode contact K1
A2: Switch mode contact K2
The switch mode for the relays, i.e. cooling or heating function, can be programmed independently
at works. Heating function means that the contact opens as soon as the setpoint is reached, thus
power interruption. At cooling function the contact closes, if the actual value is above the required
setpoint. (see fig. 1 + 2)
A3: Function of contact K1 at sensor error
A4: Function of contact K2 at sensor error
At sensor error the selected relay falls back into the condition pre-set here. If there is a data-loss in
parameter memory (display indicates “EP”) both contacts K1 and K2 are switched off.
A5: Selection setpoint 2 or DeltaW
This parameter determines whether the setpoints for thermostat 1 and 2 independently adjustable
(A5=0) or whether they are tied with one another via a switching offset DeltaW (A5=1). This
parameter applies only to contact K2 (see parameter P1).
A6: Control characteristic
With this parameter the ramp function can be activated with either relative or absolute employment
point.
A8: Display mode
The value can be indicated in integrals or with decimals and if there is a leading zero. In general,
all parameter indications are presented with decimals.
A9: Weighing factor
With this parameter the actual value can be submitted to weighing. The measured value is
multiplied by it and both indicated in the display and applied for regulation.
A10: Indication value for lower value linear analogue input
A11: Indication value for upper value linear analogue input
Only relevant, if the controller is programmed for a voltage input (0…10V linear) or a current input
(4…20mA linear). These parameters allow scaling of the linear analogue input. The value to be
indicated for the lower and upper entrance value then defines the range the controller will indicate.
For input range 4…20mA the display will show sensor error if the input signal drops below 4mA.
A19: Parameter lock
This parameter enables locking of each parameter level. If third level is locked, only parameter A19
may be changed.
A20: Activation of key acknowledgement
This parameter permits to switch on/off the key confirmation by internal buzzer.
A30: Function alarm exit
The alarm exit evaluates an upper and a lower limit value (see parameters P30 and P31), whereas
a selection is possible as to whether the alarm is active if the temperature lies within these two
limits (range alarm), or whether the alarm is released if the temperature lies beyond them
(boundary alarm). In the case of sensor error, the alarm is activated independently of this
adjustment.

A31: Special function at boundary or range alarm
Here can be selected whether, in the case of an alarm, the indication to flash and/or the buzzer is
to start. Sensor alarm (display F1L or F1H) is indicated independently thereof by flashing display
and the buzzer.
A32: Special function at boundary or range alarm
This parameter allows an alarm delay after switching-on the mains voltage
A40: Hysteresis mode contact K1
A41: Hysteresis mode contact K2
These parameters allow selection as to whether the hysteresis values which are adjustable with
P32, are set symmetrically or one-sided at the respective switching point. At symmetrical
hysteresis, half of the hysteresis’ value is effective below and half of the value above the switching
point. The one-sided hysteresis works downward with heating contact and upward with cooling
contact (see fig. 1 + 2).
A50: Minimum action time contact K1 ”On”
A51: Minimum action time contact K1 ”Off”
A52: Minimum action time contact K2 ”On”
A53: Minimum action time contact K2 ”Off”
These parameters permit a delay in switching on/off the relay in order to reduce the switching
frequency. The adjusted time sets the entire minimum time period for a switching-on or switching-
off phase.
A54: Delay after “Power-on”
This parameter allows a switching-on delay of relays after switching-on the mains voltage. This
delay corresponds with the time set here.
A55: Mutual delay of contacts K1 and K2
This parameter makes a mutual switching-on delay of relays possible, depending on whichever
contact is switched first.
A60: Sensor type
These parameter permits selection of the sensor type, if the needed hardware prerequisites are
available.
A70: Software filter
With several measuring values, it is possible to obtain an average value. This parameter can
determine by how many measured values an average value is to be formed. If a sensor with a very
fast reaction to external influences is used, an average value ensures a calm signal process.
A80: Temperature scale
Indication can be switched between Fahrenheit and Celsius. At conversion, the parameters and
setpoints maintain their numerical value and adjustment range. (Example: A controller with the
desired value of 0°C is switched to Fahrenheit. The new desired value is then interpreted as 0°F,
which corresponds to a temperature of -18°C).
NOTE: Indication limits with °F can be smaller than the actual measuring range!

Status messages
Message
Cause
Error elimination
_ _ _
Key-lock active
Change parameter P19 or A19
F1L
Sensor error,
short-circuit at sensor F1
Check sensor
F1H
Sensor error,
open-circuit at sensor F1
Check sensor
F2
Wrong connection of Pt100 sensor
Check connection
display flashes
Temperature alarm at too high or too
low temperature (if activated) see A31
Buzzer
Temperature alarm at too high or too
low temperature (if activated) see A31
The buzzer function can be
switched off with the DOWN-key
EP, display
flashes
Data loss at parameter memory
(Contacts K1 and K2 are switched off)
If error cannot be eliminated by
switching on/off, the controller must
be repaired
Error messages are saved and indicated even if the cause is eliminated. Pressing the DOWN key
deletes the error message.

Order No.: 900380.004
Technical data of ST70-31.03
Measuring input
F1: Resistance thermometer Pt100-3L
Measuring range: -99...600°C
Measuring accuracy: 0.5 K, without sensor
Outputs
K1: Relay, change-over contact, 5A 250V (cosϕ=1)
K2: Relay, change-over contact, 5A 250V (cosϕ=1)
Display
3-digit LED Display, colour red
1 LED for status display
Power supply
12...24 V AC (50/60 Hz) or 16...36V DC
Connectors
12-pole screw terminal, spacing 5.0mm, for cable up to 2.5 mm²
Ambient conditions:
Storage temperature: -20...+70°C
Operating temperature: 0...+55°C
Relative humidity: max. 75% without dew
Weight
ca. 150g
Enclosure
Front IP50
Installation data
Front size: 72 x 36 mm
Panel cut-out: 68.5 x 28.5 mm
Installation depth: ca. 67 mm with connector
Mounting: by fixing strap