STORK TRONIC ST710-PWHVR.126 Quick start guide

ST710-PWHVR.126
Six-stage controller
Order number 900310.050
Wiring diagram
Product description
The six-stage controller was developed for the control of compressor groups of up to 6 machines,
and/or the control of compressors with bypass-valves (max. 3 machines). The basic gas charac-
teristics are part of the fixed program data - therefore, it is possible to execute a pressure control
(4...20mA) and to show the temperature values at the same time. The compressor running times
can be optimised by help of the sequential or time-conditioned load replacement. The controller
that can be parametered in various ways has an alarm contact and a hour meter.
Networking of the controller takes place via the ST-Bus interface.
Front size: 84mm x 42mm
Panel cut-out: 67.5mm x 31.5mm
Connector: plug and socket
1

2

SOFTWARE
SIX-STAGE CONTROLLER ST710-xxx.126

GENERAL INFORMATION
The ST……126 controllers are designed as multi-
stage temperature controllers and offer numerous
characteristics intended for cooling industries.
Depending on the hardware, up to six relay outputs
are possible the functions of which can be
configured as required via parameters.
A special exchange and replacement logic
guarantees a balanced load of the connected
modules in case of partial load operation.
Operating times are recorded.
To protect the connected compressors minimum
downtimes can be specified for each exit
separately. In addition a mutual switch-on delay is
possible. In case of a remaining control deviation a
setpoint offset can be adjusted, which is not visible
in the display.
Depending on the existing hardware, a
temperature sensor or a linear senor (pressure)
can be connected. The type, function, offset and
weighting of each sensor can be configured
separately via parameters.
The max. two digital inputs can also be configured
separately, depending on the hardware installed.
Possible functions include: standby, setpoint
changeover.
The controller is equipped with six relays whose
function is determined by the operating mode set
with parameter A44. If a relay is not used by A44,
its function can be set with parameter A51...A56.
Please note the specifications of the respective
hardware so that the relays are not overloaded.
All parameters can also be accessed via the
RS485 interface.
CONTROL KEYS
Key T1: UP
By pressing this key the parameter or
parameter value is increased. A further
function of the key can be set with parameter .
Key T2: DWON
By pressing this key the parameter or
parameter value is decreased. A further
function of the key can be set with parameter .
Key T3: Function key
The function of the key can be set with
parameter .
Key T4: SET
While SET key is pressed, the setpoint S1 is
indicated.
Key T5: StandBy
The function of the key can be set with
parameter . It is preset as standby key.
Thus the unit can be switched on or off (no mains
disconnection).
The controller is generally controlled using the
buttons UP, DOWN and SET. The standard
display indicates the actual value of the activated
sensor, either a pressure (bar) or a temperature
(°C). Press SET button to switch over the display
to the required setpoint.
The setpoint temperature can only be changed by
pressing buttons SET and UP or SET and DOWN
at the same time. While pressing the buttons, the
changing setpoint temperature is displayed. After
changing the setpoint temperature and releasing
the buttons, the actual temperature is displayed
again. This is the standard setting method.
If you press the STANDBY button during operation
(for at least 3 seconds), the controller is switched
off and the message set with parameter  will be
displayed. To switch on the controller again, press
the STANDBY button again.
SET
T1 T3 T5T2 T4
3
2
1

In addition to setting the temperature value, the
buttons UP and DOWN perform other functions,
too. In the case of an alarm (with buzzer triggered),
the DOWN button can be used for acknowledging
the buzzer sound.
PARAMETERISATION
Parameterisation of the cooling controller is done
in the factory or during commissioning of a cold
store by qualified staff. Wrong or inappropriate
parameterisation can result in malfunction and
damage of the refrigerated goods. Parameter
setting is possible only after entering one or more
passwords. In the following list of parameters, all
parameters of a complex cooling controller are
listed. Please note, however, that the parameters
listed are only available in controller designs where
the relevant hardware (outputs, inputs, sensors
and internal clock) is available.
Parameterisation is possible at any time. The
control operation is not interrupted during
parameterisation, but can have a direct influence
on it. If no button is pressed for 2 minutes, the
operation is stopped and the actual value is
displayed again.
To activate parameterisation mode, press buttons
UP and DOWN at the same time. After approx. 3
seconds, the code word  will be displayed.
Press UP or DOWN to switch between code words
 and . All other settings / value
specifications in parameter setting mode are
performed using the default value setting method,
i.e. pressing buttons SET and UP / DOWN at the
same time.
 NETWORK ADDRESS
Under code word  you can set a
network address. This is required for
commissioning networked systems.
 ENTERING A PASSWORD
By selecting code word , you can
enter a password required for
parameterisation. Once the password
has been entered , the name of
the first group of parameters is
displayed  (alarms). Now, using
the buttons UP and DOWN you can
select any of the parameter groups
quickly.
 CONTROL CIRCUIT
Once you have selected a parameter
group, it will normally be sufficient if
you press the button SET ( will be
displayed) and then release the
button again. Now, the first parameter
of the group will be displayed
(parameter  in parameter group
, for example).
Using the buttons UP and DOWN you can scroll
the parameter group and change certain
parameter values using the default value setting
method. Press buttons UP and DOWN at the same
time to quit any parameter group and return to the
list of parameter groups. To quit the list of
parameter groups and return to the standard level,
press buttons UP and DOWN at the same time.
In some cases, certain parameter groups may be
protected by a password. In this case, you will
have to enter a specific password for the
parameter group like in the case of activation of
the parameterisation level.

*

Plant
*

Buttons and switching inputs

Control circuit

Sensors
*

Pre-defined sets of parameters
*

Networking and display

Main setpoints
* These levels by default are protected by a password.

 Plant
Para-
meter
Description of function Setting range Values
default

Function of relay K1 in case of sensor error 0: relay off
1: relay on 0

Function of relay K2 in case of sensor error 0: relay off
1: relay on 0

Function of relay K3 in case of sensor error 0: relay off
1: relay on 0

Function of relay K4 in case of sensor error 0: relay off
1: relay on 0

Function of relay K5 in case of sensor error 0: relay off
1: relay on 0

Function of relay K6 in case of sensor error 0: relay off
1: relay on 0

Selection setpoint 2 or Delta W1 0: Setpoint 2 (P1)
1: Delta W1 (P1r) 1

Selection setpoint 3 or Delta W2 0: Setpoint 3 (P2)
1: Delta W2 (P2r) 1

Selection setpoint 4 or Delta W3 0: Setpoint 4 (P3)
1: Delta W3 (P3r) 1

Selection setpoint 5 or Delta W4 0: Setpoint 5 (P4)
1: Delta W4 (P4r) 1

Selection setpoint 6 or Delta W5 0: Setpoint 6 (P5)
1: Delta W5 (P5r) 1

Temperature alarm mode
relative limits with (

,

,

)
absolute limits with (

,

,

)
0: Boundary alarm, relative limits
1: Boundary alarm, absolute limits
2: Range alarm, relative limits
3: Range alarm, absolute limits
4: as 0, but inverted
5: as 1, but inverted
6: as 2, but inverted
7: as 3, but inverted
0

Function of the buzzer and/or
the display at
temperature alarm 0: no display, no buzzer 1: display flashes
2: only buzzer enabled
3: display flashes, buzzer enabled
4: as 2., alarm can be cancelled
5: as 3., buzzer can be cancelled
6: as 5., alarm returns after

1

New alarm after alarm acknowledging 0...360 min. 30

Minimum action time K1 "Off" 0...999 sec. 0

Minimum action time K2 "Off" 0...999 sec. 0

Minimum action time K3 "Off" 0...999 sec. 0

Minimum action time K4 "Off" 0...999 sec. 0

Minimum action time K5 "Off" 0...999 sec. 0

Minimum action time K6 "Off" 0...999 sec. 0

Mutual delay of contacts 0...999 sec. 0

Delay after “Power-on”
0...999 sec. 0

Para-
meter
Description of function Setting range Values
default

Alarm suppression after "Power-On" or
after a setpoint/alarm limits change
0...999 min. 0

Operating time before time depending load
replacement
0...999 (sec. or Min.) 240

Time scale for parameter A33 0: sec.
1: min.
1

Active measuring input 0: Sensor F1: temperature
1: Sensor F2: 4..20mA, pressure
0

Refrigerant 0: R134A
1: R22
2: R407C
3: R404A
4: R507
0

Activation of time-dependent
load replacement
0: not activated
1: activated
1

Sequential operation mode 0: not activated
1: activated
1

Operating mode 0: K1-K6 without load replacement
1: K1+K2 with load replacement
2: K1+K2 as bypass-group (K2)
3: K1-K3 with load replacement
4: K1-K4 with load replacement
5: K1-K4 as bypass-group (K2+K4)
with load replacement
6: K1-K5 with load replacement
7: K1-K6 with load replacement
8: K1-K6 as bypass-group (K2+K4+K6)
with load replacement
9: as 2, K2 inverted
10: as 5, K2+K4 inverted
11: as 8, K2+K4+K6 inverted
12: K1-K3 as bypass-group (K2)
13: K1-K6 as double bypass-group
(K2+K3,K5+K6) with load replacement
0

Switch mode relay K1 0: heating contact
1: cooling contact
1

Switch mode relay K2 0: heating contact
1: cooling contact
1

Switch mode relay K3 0: heating contact
1: cooling contact
1

Switch mode relay K4 0: heating contact
1: cooling contact
1

Switch mode relay K5 0: heating contact
1: cooling contact
1

Switch mode relay K6 0: heating contact
1: cooling contact
1

Setpoint offset
-20...+20.0 (bar or °C)
0.0

Password of parameter level 
-99 ... 999
0

 Buttons and switching inputs (password-protected)
Para-
meter
Description of function Setting range Values
default

Function of key T1 0: without function
1: controller on/standby
2: Display output power (%)
3: acknowledge alarm
4: Changeover setpoint S1‘ (absolute)
5: Changeover setpoint S1‘‘ (relative)
6: display MIN
7: display MAX
8: display sensor F1
9: display sensor F2
10: Reset both MIN/MAX
11: Reset MIN
12: Reset MAX
0

Function of key T2 see

3

Function of key T3 see

2

Function of key T5 see

1

Function of external switching input E1 0: without function
1: controller on/standby
2: Changeover setpoint S1‘ (absolute)
3: Changeover setpoint S1‘‘ (relative)

Switching input E1 inverse / not inverse 0: normal
1: inverted

Function of external switching input E2 0: without function
1: controller on/standby
2: Changeover setpoint S1‘ (absolute)
3: Changeover setpoint S1‘‘ (relative)

Switching input E2 inverse / not inverse 0: normal
1: inverted

Password of parameter level

-99 ... 999 -19

 Control circuit
Para-
meter
Description of function Setting range Values
default

Auxiliary setpoint S2 absolute

...

(bar or °C) 10.0

DeltaW 1 -99.0 ... +99.9 (bar or °C) 10.0

Auxiliary setpoint S3 absolute

...

(bar or °C) 10.0

DeltaW 2 -99.0 ... +99.9 (bar or °C) 10.0

Auxiliary setpoint S4 absolute

...

(bar or °C) 10.0

DeltaW 3 -99.0 ... +99.9 (bar or °C) 10.0

Auxiliary setpoint S5 absolute

...

(bar or °C) 10.0

DeltaW 4 -99.0 ... +99.9 (bar or °C) 10.0

Auxiliary setpoint S6 absolute

...

(bar or °C) 10.0

DeltaW 5 -99.0 ... +99.9 (bar or °C) 10.0

Hysteresis for main setpoint 0.1...99.9 (bar or °C) 1.0

Hysteresis for auxiliary setpoint S2
or DeltaW 1 0.1...99.9 (bar or °C) 1.0

Hysteresis for auxiliary setpoint S3
or DeltaW 2 0.1...99.9 (bar or °C) 1.0

Hysteresis for auxiliary setpoint S4
or DeltaW 3 0.1...99.9 (bar or °C) 1.0

Hysteresis for auxiliary setpoint S5
or DeltaW 4 0.1...99.9 (bar or °C) 1.0

Hysteresis for auxiliary setpoint S6
or DeltaW 5 0.1...99.9 (bar or °C) 1.0

Lower setpoint limit -99.0...

(bar or °C) -99.0

Upper setpoint limit

...+999 (bar or °C) 100.0

Lower alarm limit, relative to main setpoint -99.0 ... +99.9 (bar or °C) -10.0

Upper alarm limit, relative to main setpoint -99.0 ... +99.9 (bar or °C) 10.0

Hysteresis alarm contact -99.0 ... +99.9 (bar or °C) 1.0

Lower alarm limit, absolute -99.0...

(bar or °C) -99.0

Upper alarm limit, absolute

...+999 (bar or °C) 100.0

Total operating time K1, hours Not adjustable 0

Total operating time K1, *1000 hours Not adjustable 0

Total operating time K2, hours Not adjustable 0

Total operating time K2, *1000 hours Not adjustable 0

Total operating time K3, hours Not adjustable 0

Total operating time K3, *1000 hours Not adjustable 0

Total operating time K4, hours Not adjustable 0

Total operating time K4, *1000 hours Not adjustable 0

Total operating time K5, hours Not adjustable 0

Total operating time K5, *1000 hours Not adjustable 0

Total operating time K6, hours Not adjustable 0

Total operating time K6, *1000 hours Not adjustable 0

Password of parameter level

-99 ... 999 0

 Temperature sensors
Para-
meter
Description of function Setting range Values
default

Mains frequency 0: 50Hz
1: 60Hz 0

Actual value of sensor F1 Measured value, not adjustable

Calibration sensor F1 (act. value correction) -20...+20.0°C 0.0

Weighting factor sensor F1 0.50...1.50 1.00

Selection sensor F1
Depending on hardware, not all types are
available. Sensor will be deactivated in this
case.
0: not existent
1: PTC (-50…..+150°C)
2: Pt100 2-wire (-100…+600°C)
3: Pt100 3-wire (-100…+500°C)
4: NTC (-40……+40°C)
5: Pt1000 2-wire (-100…+330°C)
6: Pt1000 3-wire (-100…+300°C)
7: 0-20mA
8: 4-20mA
9: 0-10V
2

Software filter sensor F1 1 ... 32 12

Display at 0/4mA and sensor

=7/8/9 -99..+999 0.0

Display at 20mA and sensor

=7/8/9 -99..+999 100

Actual value of sensor F2 Measured value, not adjustable

Calibration sensor F2 (act. value correction) -20...+20.0°C 0.0

Weighting factor sensor F2 0.50...1.50 1.00

Selection sensor F2 see

8

Software filter sensor F2 1 ... 32 16

Display at 0/4mA and sensor

=7/8/9 -99..+999 2.0

Display at 20mA and sensor

=7/8/9 -99..+999 30.0

Password of parameter level

-99 ... 999 0
 Pre-defined parameter sets (password-protected)
Para-
meter
Description of function Setting range Values
default

Parameter set 0: Temperature sensor
1: Pressure sensor, refrigerant R134A
2: Pressure sensor, refrigerant R22
3: Pressure sensor, refrigerant R407C
4: Pressure sensor, refrigerant R404A
5: Pressure sensor, refrigerant R507
0

Password for entering level selection
(  in display)
-99 ... 999 -19

Password of parameter level 
-99 ... 999
-19
Warning: Changes made in the parameter set will change all parameter settings!
Parameter  can only be viewed and set via ST-bus.

 Networking and display (password-protected)
Para-
meter
Description of function Setting range Values
default

Own address ST-bus
Identical to setting

0: deactivated
1 ... 250 1

Temperature scale 0: °C
1: °F 0

Display mode 0: 3 digits, integers
1: 3 digits, rounded to 0.5
2: 3 digits, 0.1
3: 4 digits, integers
4: 4 digits, rounded to 0.5
5: 4 digits, 0.1
5

Software version

Display in standby mode 0: OFF
1: AUS
2: right decimal point
3: right decimal point flashing
4: time, OFF in case of an error
1

Access restriction 0: all parameters read/writeable
1: Setpoints write-protected
2: Parameter write-protected
3: Setpoints and parameters
write-protected.
4: as 3,

also write-protected
0

ST bus release mask for functions 0 .. 255 233

Reset MIN- and/or MAX -memory 0: -
1: reset MIN
2: reset MAX
3: reset MIN and MAX
0

Reset operating time of relay K1 0: -
1: reset 0

Reset operating time of relay K2 0: -
1: reset 0

Reset operating time of relay K3 0: -
1: reset 0

Reset operating time of relay K4 0: -
1: reset 0

Reset operating time of relay K5 0: -
1: reset 0

Reset operating time of relay K6 0: -
1: reset 0

Password of parameter level

-99 ... 999 -19

MASTER PASSWORD
All passwords can be edited through parameteri-
sation. If you don't remember a password, you can
still parameterise the controller and look up and/or
edit the password via a master password. To do
that, follow these steps:
1. Switch off power supply (disconnect from mains
or switch off power supply unit)
2. Press buttons UP, DOWN and SET at the same
time and switch on power supply again.
3. Now, a ("Challenge") number will be displayed
for approx. 5s.
In no case disconnect the controller from power
supply now. Otherwise, the number will become
invalid. Using this number, you can call our sales
staff, phone [phone] to request the
master password ("Response"). Enter this master
password in the 1st control level in .
Important: Even if you remember the password,
you must enter the master password here. If the
password is accepted, you will enter the parameter
selection levels and all passwords will be deacti-
vated. By pressing the SET button (display )
you can switch to the relevant parameter level.
Now, the master password is no longer required.
The passwords will remain deactivated until the
controller is disconnected from power supply
again. In case you leave the parameter level now,
simply press the SET button in  in order to
access the parameter selection levels again.
STATUS DISPLAY AND ERROR MESSAGES
Message
Cause
Remedy

High temperature and/or
overpressure above alarm limit

Low temperature and/or low-pressure
below alarm limit

Error on sensor F1,
short-circuit Check sensor F1

Error on sensor F1,
wire broken Check sensor F1

Internal error in control unit Repair control unit

Error in parameter memory
Check all parameters

Error of internal clock Set clock again. If error occurs again, the
controller must be repaired
Errors  and  will disable the controller. The controller will only be enabled again once the error has
been repaired. Error  can only be eliminated by repair. The errors and the current temperature will be
displayed alternately.

 Plant
 Function of relay K1 in case of sensor error
 Function of relay K2 in case of sensor error
 Function of relay K3 in case of sensor error
 Function of relay K4 in case of sensor error
 Function of relay K5 in case of sensor error
 Function of relay K6 in case of sensor error
At sensor error the display flashes and indicates
either  or . The respective relay falls back
into the condition pre-set here.
 Selection setpoint 2 or Delta W1
This parameter determines whether the setpoints
for thermostat 1 and 2 are independently adjustable
(A12=0, ) or whether they are tied with one an-
other via a switching offset DeltaW1 (A12=1, ).
 Selection setpoint 3 or Delta W2
This parameter determines whether the setpoints
for thermostat 1 and 3 are independently adjustable
(A13=0, ) or whether they are tied with one an-
other via a switching offset DeltaW2 (A13=1, ).
 Selection setpoint 4 or Delta W3
This parameter determines whether the setpoints
for thermostat 1 and 4 are independently adjustable
(A14=0, ) or whether they are tied with one an-
other via a switching offset DeltaW3 (A14=1, ).
 Selection setpoint 5 or Delta W4
This parameter determines whether the setpoints
for thermostat 1 and 5 are independently adjustable
(A15=0, ) or whether they are tied with one an-
other via a switching offset DeltaW4 (A15=1, ).
 Selection setpoint 6 or Delta W5
This parameter determines whether the setpoints
for thermostat 1 and 6 are independently adjustable
(A16=0, ) or whether they are tied with one an-
other via a switching offset DeltaW5 (A16=1, ).
 Temperature alarm mode
The alarm exit evaluates an upper and a lower limit
value, whereas a selection is possible as to
whether the alarm is a boundary or a range alarm
and weather it has absolute or relative limit values.
Function of the buzzer and/or the display
at temperature alarm
Here, you can define if a temperature alarm is to be
displayed or not and if the buzzer is to sound.
Additionally, you can define if the buzzer is to
sound again after acknowledgement. The corres-
ponding time is indicated in A19. The error
message and the temperature will be displayed
alternately as long as the alarm is present. If more
than one alarm messages are present, they will be
displayed alternately. The alarm relay will signal the
alarm at all times.
 New alarm after alarm acknowledging
Alarms which have not been eliminated will be
switched on again by the buzzer after the set time.
This only applies if [=6].
 Minimum action time K1 "Off"
 Minimum action time K2 "Off"
 Minimum action time K3 "Off"
 Minimum action time K4 "Off"
 Minimum action time K5 "Off"
Minimum action time K6 "Off"
These parameters permit a delay in switching on
the relay in order to reduce the switching frequency.
The adjusted time sets the entire minimum time
period for a switching-off phase.
 Mutual delay of contacts
This parameter makes a mutual switching-on delay
of relays possible, depending on whichever contact
is switched first. It ensures that two output contacts
do not switch simultaneously. If there are multiple
bypass groups defined with parameter  the
mutual delay affects entire groups. The mutual
delay affects no free contacts that are not involved
in the load replacement. With =0 the delay is
always effective
 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. The delay
applies not to alarm contact K7
 Alarm suppression after "Power-On" or
after a setpoint/alarm limits change
If boundary alarm is selected with parameter 
this parameter allows a switching-on delay of the
alarm contact K7 after switching on the mains
voltage. This delay corresponds with the time set
here. This suppression does not apply to sensor
error alarm or, if activated, external alarms. If range
alarm is selected, this parameter is ineffective

Operating time before time depending
load replacement
Load replacement depending on time is mainly
used in the field of refrigeration technology to ba-
lance the use of the connected compressors. If only
some of the outputs are continuously active, out-
puts that have not yet been activated will be used.
This parameter determines the time to elapse be-
fore outputs are changed for the first time. If there
are multiple bypass groups defined with parameter
 the load replacement affects entire groups.
Time scale for parameter 
Parameter  sets the time scale for parameter
 (seconds or minutes).
Active measuring input
This parameter selects either temperature or
pressure measuring. Deactivated sensors can be
disconnected; their measuring input causes no
error message. At the same time the scale of the
main display is set to either “°C” or “bar”.
Refrigerant
Selection of the used refrigerant in the plant.
 Time-dependent load replacement
This parameter either activates or deactivates time-
dependent load replacement to balance the use of
the connected compressors. The replacement
takes place after the operating time set with
parameters  and .
 Sequential operation mode
This parameter either activates or deactivates the
sequential operation mode. If this mode is activated
different compressors or bypass-groups will be ac-
tivated or deactivated (if possible) at each change
of output stage to ensure an even load of the
compressors.
Concerning the switching of the compressors or
bypass-groups the following applies:
If several compressors or bypass-groups are acti-
vated the first started unit will be deactivated first.
If several units are deactivated the first stopped unit
will be activated first.
If in sequential operation mode the connections of
the units to the respective output stage is ineffec-
tive. The control prevents the switching of valves if
the compressor has not started and assures the
simultaneous switch-off of valves when the com-
pressor is switched off. The minimum action times
(parameters -) concerning valves will be
adjusted to the times of the respective
compressors.
 Operating mode
If a sequential operation mode or the time-depen-
dent load replacement is activated with parameter
 and , parameter  selects which
outputs are involved in this mode.
Additionally it is possible to define pairs of outputs
that work as bypass-groups. In this case the acti-
vation of the valve output leads to a smaller cooling
performance. In the bypass-groups there is a
standard linkage of the outputs, i.e.
K1=compressor,
K2=bypass,
K3=compressor,
K4=bypass,
K5=compressor,
K6=bypass.
Bypass-groups with an inverted valve output are
intended for plants where the bypass is switched on
together with the compressor and switched off
together with the valve output.
A special function (=12) allows the operation of
two compressors together with a common bypass
with
K1+K3=compressor,
K2=bypass.
In this case K4 becomes inactive, because
parameters P3 and P14 are reserved. A further
special function (=13) is intended for the
operation with double bypass-groups with
K1=compressor,
K2+K3=bypass,
K4=compressor,
K5+K6=bypass.
Not that the sequential operation mode and the
time-dependent load replacement are effective
independently of each other if activated with para-
meters  and . If bypass operation mode is
selected, the required valves are determined
summarily in the control program.
If the respective setting requires several bypass
valves to be switched on, the output with the
highest number will be switched on first.

 Switch mode relay K1
 Switch mode relay K2
 Switch mode relay K3
 Switch mode relay K4
 Switch mode relay K5
 Switch mode relay K6
The switching sense for the relays, i.e. cooling or
heating function, can be programmed independ-
ently. The respective relay may not be part of the
load replacement mode (see parameter ) or
part of any bypass-group. If this applies the respec-
tive relay switches to cooling function independently
of this parameter. Note that the power display
indicates the active outputs K1-K6 only summarily.
A differentiation of heating and cooling power is not
possible.
 Setpoint offset
The here adjusted value will build the difference to
the activated setpoint, i.e. there is no regulation
according to the pre-set value, but according to the
sum of setpoint and the value of A59. All auxiliary
setpoints that apply to outputs involved in the load
replacement or bypass-groups are affected by this
parameter as well. The remaining free outputs and
the alarm limit values are not affected
 Password of parameter level 
With this parameter, you can set the password for
parameter level .
 Buttons and
switching inputs (password-protected)
 …  Function of key T1… T8
Certain functions can be assigned to the buttons.
The buttons are arranged according to the front foil,
the layout may differ from case to case. For the
function of the buttons, refer to the operating
manual of the relevant device. The "SET" cannot be
assigned another function!
,  Function of E1 and E2
Certain functions can be assigned to the switching
inputs.
,  Switching sense E1 and E2
You can define if the switching input is used as a
NO contact (normal) or NC contact (inverse).
 Password of parameter level 
With this parameter, you can set the password for
parameter level .
 Control circuit
 Auxiliary setpoint S2
 Auxiliary setpoint S3
 Auxiliary setpoint S4
 Auxiliary setpoint S5
 Auxiliary setpoint S6
Adjustment of the auxiliary setpoints if
...=0. The adjustment range is set with
parameters  and .
 Delta W1
 Delta W2
 Delta W3
 Delta W4
 Delta W5
If ...=1 this value is added to the main
setpoint and results in the auxiliary setpoint.
 Hysteresis for relay K1
 Hysteresis for relay K2
 Hysteresis for relay K3
 Hysteresis for relay K4
 Hysteresis for relay K5
 Hysteresis for relay K6
The hysteresis is set symmetrically at the setpoints,
i.e. half of the hysteresis' value is effective below
and half of the value above the switching point.
Note that a small hysteresis permits a more exact
regulation, however also leads to more frequent
switching frequency decreasing the lifetime of the
relay.
Lower setpoint limit
Upper setpoint limit
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.
 Lower alarm limit, relative
The lower alarm limit value is the sum of the active
main setpoint and the value of . It is effective if
=0, 2, 4 or 6. If the temperature falls below this
value, an alarm is triggered according to  and
the alarm contact K7 is switched according to .
 Upper alarm limit, relative
The upper alarm limit value is the sum of the active
main setpoint and the value of . It is effective if
=0, 2, 4 or 6. If the temperature exceeds this
value, an alarm is triggered according to  and
the alarm contact K7 is switched according to .

Hysteresis alarm contact
Hysteresis is set symmetrically at the adjusted limit
value. It becomes effective depending on alarm
definition.
 Lower alarm limit, absolute
This is the absolute lower alarm limit. It is effective
if =1, 3, 5 or 7. If the temperature falls below
this value, an alarm is triggered according to 
and the alarm contact K7 is switched according to
.
 Upper alarm limit, absolute
This is the absolute upper alarm limit. It is effective
if =1, 3, 5 or 7. If the temperature falls below
this value, an alarm is triggered according to 
and the alarm contact K7 is switched according to
.
Total operating time K1, hours
 Total operating time K1, *1000 hours
The total operating time of the switched-on relay K1
in hours results of *1000+. The value is
stored every operating hour, resulting in a maxi-
mum inaccuracy of one hour in case of mains
failure. After replacing plant components the
counter can be reset with parameter .
 Total operating time K2, hours
 Total operating time K2, *1000 hours
The total operating time of the switched-on relay K2
in hours results of *1000+. The value is
stored every operating hour, resulting in a maxi-
mum inaccuracy of one hour in case of mains
failure. After replacing plant components the
counter can be reset with parameter .
 Total operating time K3, hours
 Total operating time K3, *1000 hours
The total operating time of the switched-on relay K3
in hours results of *1000+. The value is
stored every operating hour, resulting in a maxi-
mum inaccuracy of one hour in case of mains
failure. After replacing plant components the
counter can be reset with parameter .
 Total operating time K4, hours
 Total operating time K4, *1000 hours
The total operating time of the switched-on relay K4
in hours results of *1000+. The value is
stored every operating hour, resulting in a maxi-
mum inaccuracy of one hour in case of mains
failure. After replacing plant components the
counter can be reset with parameter .
 Total operating time K5, hours
 Total operating time K5, *1000 hours
The total operating time of the switched-on relay K5
in hours results of *1000+. The value is
stored every operating hour, resulting in a maxi-
mum inaccuracy of one hour in case of mains
failure. After replacing plant components the
counter can be reset with parameter .
 Total operating time K6, hours
 Total operating time K6, *1000 hours
The total operating time of the switched-on relay K6
in hours results of *1000+. The value is
stored every operating hour, resulting in a maxi-
mum inaccuracy of one hour in case of mains
failure. After replacing plant components the
counter can be reset with parameter .
 Password of parameter level 
With this parameter, you can set the password for
parameter level .
 Sensors
 Mains frequency
In this parameter, you must define the mains
frequency.
,  Act. value sensor F1 .. F2
The temperature value shown here is used for
control. It is calculated as follows:
Actual control value =
(actual measured value * weighting factor)
+ actual value correction
Actual value correction and weighting factor must
be defined in the following parameters. This
corrects actual value deviations in special applica-
tions (refrigerated shelves or similar) due to
unfavourable sensor location.
,  Calibration sensor F1 and F2
act. value correction
With this parameter it is possible to correct actual
value deviations caused by sensor tolerances, very
long sensor cables or structural protections (e.g.
ex-barriers), for example. The value defined here is
added to the measured value.
,  Wichtungsfaktor F1 und F2
With this parameter, it is possible to correct actual
value deviations due to unfavourable sensor
location. The value measured by the controller is
multiplied by the value set here.

,  Sensor selection F1 / F2
With this parameter, you can define the sensor
type. Depending on the hardware, not all sensor
types may be supported. For the NTC sensor, a
parallel resistor will have to be connected.
,  Software filter F1 / F2
In this parameter, you can define how many meas-
ured values are to be used for calculating a mean
value. A mean value is calculated from the last
measured values, with the oldest measured value
being deleted (so called "Moving Average Filter").
,  F1/F2: Display at 0mA / 4mA / 0V
If, when choosing the sensor  /  = 7, 8 or 9
is selected (0/4…20mA or 0...10V linear sensor),
you can define via this parameter which value is to
be displayed in the case of a current of 0 or 4mA or
a voltage of 0V. The value to be displayed for
20mA/10V can be defined in the next parameter.
The actual measured value is calculated as linear
interpolation between these two values.
,  F1/F2: Display at 20mA / 10V
If, when choosing the sensor  /  = 7, 8 or 9
is selected (0/4…20mA or 0...10V linear sensor),
you can define via this parameter which value is to
be displayed in the case of a current of 20mA or a
voltage of 10V. The display value for 0/4mA or 0V
is defined in the previous parameter. The actual
measured value is calculated as linear interpolation
between these two values.
 Password for parameter level 
This parameter sets the password for level .
 Pre-defined parameter
sets (password-protected)
 Intern: active data set
With this parameter, you can set up pre-defined
data sets. The data sets are provided by Störk-
Tronic. If a new data set is loaded, all previously set
parameters will be overwritten. After that, they can
be edited as required. The most important settings
are shown in the appendix. Basically the different
refrigerants are configured.
 Password for accessing level selection
With this parameter, you can set the level selection
password, i.e. in display . In the standard design,
access to level selection is blocked by password
.
 Password of parameter level 
With this parameter, you can set the password for
parameter level .

 Networking and
display (password-protected)
 ST-Bus own address
With the address set here, the controller can be
addressed via the bus. Each bus client must have
its own address. Addresses must be unique, i.e.
must not be assigned several times.
 Temperature scale
With this parameter, you can define if temperature
values are to be displayed in °F or °C.
 Display mode
Here, you can switch over between 3-digit and 4-
digit display. However, if the hardware provides 3
digits only, the left digit will be lost, i.e. the sign in
the case of negative numbers. You can also define
here if values are to be displayed without decimal
places, with rounded decimal place or exactly.
 Software-Version
The software version of the controller is indicated.
 Display in standby mode
In this parameter, you can define what is to be
displayed in standby.
 Access restriction
With this parameter certain settings can be locked:

Setpoints Parameters

0
rw
rw
rw
1
ro
rw
rw
2
rw
ro*
rw
3
ro
ro*
rw
4
ro
ro*
ro
rw: value is read- and writeable
ro: value is read-only (write-protected)
*Note:The parameter  is always adjustable!
 Mask on enabled functions
Here, you can specify the functions enabled via the
bus using a binary mask. The bits have the
following meaning:
Para
Bit
Valency
Function

0
1
controller on/off
1
2
control circuit 1 on/off
2 4 Defrosting request
3
8
Acknowledge alarm
4
16
Main setpoint S1‘ absolute
5
32
Main setpoint S1‘‘ relative
6 64 Reset MIN
7
128
Reset MAX
To determine the value to be parameterised, all
valencies must be added up.
 Reset MIN and/or MAX memory
Chose a value to reset the respective memory. 
is set back to 0 automatically. This function can be
locked by appropriate setting of parameter .
 Reset operating time of relay K1
 Reset operating time of relay K2
 Reset operating time of relay K3
 Reset operating time of relay K4
 Reset operating time of relay K5
 Reset operating time of relay K6
If set to 1, the operating time of the respective relay
is reset to 0. The parameter itself is set back to 0
automatically.
 Password for parameter level 
With this parameter, you can set the password for
parameter level .

Appendix A:
If one of the parameters ,  or is changed, the following values are set automatically:
If parameter  is modified all parameters are reset to their default value, even if they are not
listed in the table below. The operating times of the relays and the passwords of the
individual parameter levels are excluded from this.
If parameter  (active measuring input) is modified from 1 (pressure) to 0 (temperature)
only the values of the first column are considered.
If is modified from 0 (temperature) to 1 (pressure) the values of the column corresponding
to the setting of  are considered.
If the refrigerant is changed and  = 1 (pressure), the values of the column corresponding
to the new setting of  are considered. If  = 0 (temperature) only parameter  is
modified but no further parameters.

0 1 2 3 4 5

0
1
1
1
1
1
Temperature
Pressure

0
0
1
2
3
4
R134A
R134A
R22
R407C
R404A
R507

0.0
0.0
0.0
0.0
0.0
0.0

10.0
3.1
5.8
5.4
7.1
7.4

10.0
1.1
1.7
1.8
2.1
2.2

20.0
4.6
8.0
7.8
9.9
10.1

20.0
2.6
3.9
4.2
4.9
4.9

30.0
6.7
10.9
10.7
13.1
13.4

30.0
4.7
6.8
7.1
8.1
8.2

40.0
9.2
14.2
14.4
17.2
17.3

40.0
7.2
10.1
10.8
12.2
12.2

50.0
12.1
18.4
18.9
21.9
21.9

50.0
10.1
14.3
15.3
16.9
16.8

1.0
0.2
0.2
0.2
0.2
0.2

1.0
0.2
0.2
0.2
0.2
0.2

1.0
0.2
0.2
0.2
0.2
0.2

1.0
0.2
0.2
0.2
0.2
0.2

1.0
0.2
0.2
0.2
0.2
0.2

1.0
0.2
0.2
0.2
0.2
0.2

-99.0
-0.9
-0.9
-0.9
-0.8
-0.9

100.0
30.0
30.0
30.0
30.0
30.0

-10.0
-1.0
-1.6
-1.4
-1.7
-1.7

10.0
1.1
1.7
1.9
2.2
2.2

1.0
0.2
0.2
0.2
0.2
0.2

-99.0
-0.9
-0.9
0.0
0.0
-0.9

100.0
30.0
30.0
30.0
30.0
30.0