ST501-KU3KA.12P
Controller for cooling applications
Order number 900220.02 0
As of: 23.03.2015, software V2.24
Wiring diagram
Product description
The microprocessor-controlled controller ST501-KU3KA.12P consists of a service and a separate power
pack plate and is used for thermostatic temperature regulation in simple refrigerating plants. It is supplied
with 230V AC and has four relay outputs as well as an exit for a DC voltage fan.
The relays can be used for different functions, e.g. for a compressor, a defroster, an alarm relay, etc.. (see
parameters U1-U4). The two resistance sensors seize the refrigerating chamber temperature and the
evaporator temperature.
Sensor: PTC
Range: -55...99
Front size: 106mm x 68mm
Panel cut-out: 87.5mm x 56.5mm
Tightness: front IP65
Connector: cage clamp
Customised Characteristics:
S1=2; P5=0; r1=2; r2=10; c3=2; d0=3; d1=1; d2=5; d3=20; d7=0;
A1=-5; A3=240; A6=0; F5=0; F7=1; F8=71; F9=71; F10=5; b1=4; U3=6;
_C
Order No.: 900220.020 V2.24 1/11
Order No.: 900220.020 V2.24 2/11
SOFTWARE .12
Parameter
Function
Adjustment range
Standard
setting
Customer
setting
S1
Setpoint
r1...r2
0.0°C
2.0°C
1
2
3
4
5
6
Adjustment options
Key 1: UP
Defrosting can be started any time by pressing the UP-key for 3 seconds. During the
process of defrosting the respective LED is illuminated. The LED flashes if defrosting is
requested, but may not be started yet due to interlock conditions.
Key 2: DOWN
The DOWN key, among other functions, can acknowledge an alarm. The internal
buzzer is then switched off.
Key 3: (if available)
Different functions are assigned to this key by help of parameters, see parameter b1.
(direct switching of a contact, standby function…). The key must be pressed for at least
half a second.
Key 5: SET
While SET key is pressed, the setpoint is indicated.
In addition, the SET key is used for setting parameters
.
Key 6: Standby
With this key the controller is switched to standby mode. Pressing the key a second
time, restarts the unit. The key can be deactivated by setting the respective parameter,
see parameter b3.
First control level:
Parameter setting for the main 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.
General reference
Note that the value is transferred to the captive memory and is safe also after power failure.
Order No.: 900220.020 V2.24 3/11
Parameter
Function
Adjustment range
Standard
setting
Customer
setting
r0
Hysteresis for the compressor contact
1...15 K
2 K
P2
Indication actual value of sensor F2
-
PA
Access to parameter list of the third
Password:: -19
-99...+99
0
Parameter
Function
Adjustment range
Standard
setting
Customer
setting
P0
Indication of actual value of sensor
F1
P1
Calibration sensor F1,
actual value correction
-9.9 ... +9.9 K
0.0 K
P2
Indication of actual value of sensor
F2 (only available if P4≠0)
P3
Calibration sensor F2,
(only available if P4≠0)
-9.9 ... +9.9 K
0.0 K
P4
Evaluation of sensor F2
0: not evaluated
1: evaluated as evaporator sensor
1
P5
Indication mode
0: integrals
2: accuracy 0,1 °C
1 0
P6
Display unit, indication in standby
0: Fahrenheit (“AUS”)
3: Celsius (“OFF”)
1
Second control level:
Setting of control parameters
The parameters can also be set in standby mode. Simultaneously pressing the UP and DOWN key for at
least 4 seconds opens a parameter list containing frequently used parameters (the complete list of all
parameters is to be found on the third control level).
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 45 seconds, or by
simultaneously pressing the UP and DOWN key for approx. 4 seconds.
control level
Parameter P2 is only indicated if P4 ≠ 0.
Third control level (all parameters):
Setting of control parameters
Access to the third control level is granted when selecting parameter PA on the second control level.
Parameter PA is to be set at '-19'. Then the key UP and DOWN have to be simultaneously pressed for
approx.. 4 seconds which will give access to the third control level, beginning with parameter P0. 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 45 seconds, or by
simultaneously pressing the UP and DOWN key for approx. 4 seconds.
actual value correction
mode
Order No.: 900220.020 V2.24 4/11
1: accuracy 0,5 °C
1: Celsius (“AUS”)
2: Fahrenheit (“OFF”)
Parameter
Function
Adjustment range
Standard
setting
Customer
setting
P7
Sensor type
11: Pt100 2-wire
22: NTC 2-wire
P8
1: not active
measuring values
r0
Hysteresis for the compressor
contact
1...15 K
2 K
r1
Setpoint limitation (minimum)
-50 °C...r2
-50 °C
2.0°C
r2
Setpoint limitation (maximum)
r1...+150 °C
50 °C
10.0°C
r3
Switching sense of compressor
0: cooling
1: heating
0
c0
Start protection of the compressor
after "cooling on"
0...240 min.
0 min.
c1
Start protection after com pr. start
0...240 min.
5 min.
c2
Start protection after compr. stop
0...240 min.
3 min.
c3
Function in the case of error of
0: relay off
2: emergency operation
0
2
d0
Defrosting interval
0 = inactive, no defrosting
1...99 h
8 h 3 h
d1
Defrosting mode
0: electrical
1: with hot gas
0
1
d2
Defrosting temperature
-50...+150 °C
10 °C
5.0°C
d3
Defrosting time limit
1...99 min.
30 min.
20 min.
d6
Indication of the refrigerating
defrosting
0: actual temperature
before the start of defrosting
1
d7
Drainage time
0...15 min.
2 min.
0 min.
A0
Hysteresis for alarm
1...15 K
2 K
-5 K
A1
Minimum limit value
-99.0 ... -0.1 K; 0 = inactive
-10 K
A2
Maximum limit value
+0.1...+99.0 K ; 0 = inactive
10 K
A3
Alarm suppr. time after “cooling on”
0...240 min.
120 min.
240 min.
A6
Alarm suppression time after
temperature alarm
0...240 min.
2 min.
0 min.
A7
Alarm suppression time after
defrosting
0...240 min
15 min.
A9
Switching sense alarm contact
0: relay on
1: relay off
1
F4
Defrosting behaviour
0: ventilator off during defrosting
1: ventilator on during defrosting
1
F5
Ventilator deceleration time after
defrosting
0...240 min.
2 min.
0 min.
F7
Ventilator function at cooling
1: always on
on and sensor F2 < sensor F1
2 1
F8
Ventilator revolution number at
normal cooling operation
0..100%
100
71
F9
Ventilator revolution number at
defrosting
0..100%
100
71
F10
Kick-start
0..60s
0
5
(applies to both sensors)
Software filter
(applies to both sensors)
sensor F1
21: PTC 2-wire
22: PT1000 2-wire
2...64: average value with 2 ... 64
1: relay on
21
8
chamber temperature during
operation
1: temperature determined just
2: on or off together with the
compressor
3: on whenever the compressor is
Order No.: 900220.020 V2.24 5/11
Parameter
Function
Adjustment range
Standard
setting
Customer
setting
b1
Function key A
0: no function
5: actual value sensor F2 (toggle)
0
b2
Function key B
(if available)
see b1
0
b3
Function standby key
0: no function
1: controller on/off (standby)
1
b11
Function switching input E1
0: no function
standby mode
0
b12
Function switching input E2
see b11
0
b13
Function switching input E3
(if available)
see b11
0
b14
Function switching input E4
(if available)
see b11
0
U1
Exit connection K1
0: no connection
9: on, if controller on
1
U2
Exit connection K2
see U1
2
U3
Exit connection K3
(if available)
see U1
3
6
U4
Exit connection K4
(if available)
see U1
4
L0
Own ST-Bus address
0: inactive
1 ... 250
0
L40
Mask for Low-Byte of Status 0
(ST-Bus)
0 ... 255 (binary coded)
Pro
Program version
(if available)
1: controller on/off (standby)
2: Setpoint thermostat 2 (Y1)
3: relay directly, switched off in
standby mode
4: relay directly, regardless of
standby mode
1: controller on/off (standby)
2: starting defrost
3: relay directly, switched off in
standby mode
4: relay directly, regardless of
1: connection to compressor
2: connection to defrost
3: connection to ventilator
4: connection to alarm
5: connection to thermostat 2
6: connection to key A, E1 or E3
7: connection to key B, E2 or E4
8: connection to buzzer
4
Order No.: 900220.020 V2.24 6/11
Parameter description:
The following values can change the equipment characteristics
and are therefore to be set with utmost care.
P0: Indication actual value of sensor F1
The here indicated temperature presents the sum of
actual measured value of feeler F1 and the actual
value correction according to parameter P1.
P1: Calibration sensor F1, 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.
P2: Indication actual value of sensor F2
The here indicated temperature presents the sum of
actual measured value of sensor F2 and the actual
value correction according parameter P3.
P3: Calibration sensor F2, 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.
P4: Evaluation of sensor F2
Sensor F2 can be used for the determination of the
evaporator temperature (P4=1) or for the second
thermostat (P4=2).
If, in simpler refrigerant plants only the refrigerating
chamber sensor is used, the feeler entrance for
sensor F2 as well as its data recording (P4=0) can
be deactivated here. Among other, parameter d2
has no meaning in the deactivated condition.
P5: Indication mode
The actual value can be indicated with diff er ent
accuracy.
Actual values and parameter values are always set
for highest accuracy.
P6: Display unit, indication in standby mode
This parameter allows display settings (°F or °C) and
("AUS" or "OFF") in standby mode.
P7: Sensor type
This parameter makes it is possible to adjust the
feeler type of both sensors. Depending on the
hardware not all sensor settings are possible.
P8: Filter
This parameter can determine by how many
measured values an average value is to be formed.
r0: Hysteresis for the compressor contact
Parameter r0 sets the temperature margin between
switching off and switching on of the compressor. A
small hysteresis permits a more exact regulation,
however also leads to more frequent switching of the
compressor. The hysteresis is set one-sided above
the setpoint.
r1: Setpoint limitation (minimum)
r2: Setpoint limitation (maximum)
These parameters limit the adjustment range of the
setpoint S1, in order to avoid that the end user sets
inadmissible values for the plant.
The entire adjustment range is equivalent to the
maximum operating range of a PTC sensor.
r3: Switching sense of the compressor
c0: Start protection of the compressor after
"cooling on"
After cooling is switched on (e.g. by switching on the
mains voltage) the start of the compressor is
retarded until the protection running time is over.
This secures e.g. that several cooling units do not
start at the same time and load the electricity supply
net.
c1: Start protection of the compressor after
compressor start
This time protection starts when the compressor is
switched on. After switching the compressor off, a
renewed switching on is impossible until this
protection time runs out. This prevents from too
frequent switching-on of the compressor and thus
increases its life span.
c2: Start protection of the compressor after
compressor stop
This time protection starts when the compressor is
switched off. After switching the compressor off, a
renewed switching on is impossible until this
protection time runs out.
c3: Function in the case of error of refrig erating
chamber sensor F1
Here is determined whether the compressor keeps
running or not in the case of an error of the
refrigerating chamber feeler F1. When deepfreezing, the compressor should normally continue
running, in order to prevent de-frosting of the goods.
At the normal cooling range above 0 °C, a
continuation, however, could lead to frost damages.
In the operation mode "emergency operation" the
compressor is switched on and off in 5 minute
intervals. This results in a clock operation with 50 %
Order No.: 900220.020 V2.24 7/11
cooling performance.
d0: Defrosting interval
The defrosting interval defines the time, after which
a defrosting process is started. With the beginning of
the defrosting process, the defrosting interval starts
anew, which results in periodic defrosting in firm
intervals.
Defrosting can also be started by pressing the key
"manual defrosting" for at least 3 seconds. This
automatically restarts the defrosting interval.
After switching-on cooling, the controller immediately
initiates cooling and starts the first defrosting
process after this interval.
d1: Defrosting mode
This parameter determines whether defrosting is
effected by an electrical heating coil (d1=0) or by
means of hot gas (d1=1).
d2: Defrosting temperature
The defrosting process is terminated when the
evaporator has reached the adjusted temperature.
(Always provide good thermal contact between
evaporator sensors and lamellas).
In case that defrosting takes too long, the time limit
set in "d3" will come into effect.
d3: Defrosting time limit
Here the maximal defrosting time can be adjusted.
According to this time frame, defrosting is terminated
even if the evaporator is not warm enough to be icefree.
d6: Indication of the refrigerati n g chamber
temperature during defrosting
It is to be assumed that the refrigerating chamber
temperature slightly rises during the defr os ting
process. d6=0 indicates the actual refrigerating
chamber temperature during the defrosting process.
d6=1 indicates the temperature determined just
before the start of defrosting until the setpoint of the
refrigerating chamber is reached again after the
defrosting process is completed. Thus, an irritation
of the operator during defrosting can be avoided. In
the case of emergency, the display flashes and the
actual temperature of the refrigerating chamber is
indicated.
d7: Drainage time
Completed defrosting is immediately followed by a
drainage period, in order to let the evaporator drip
off. During drainage time, the exits compressor and
ventilator are switched off .
A0: Switching hysteresis for alarm
The hysteresis of the alarm contact is
asymmetrically, set downward at the maximum
alarm value upward at the minimum alarm value.
A1/A2: Minimum/maximum limit values
The limit values serve for monitoring of the
refrigerating chamber temperature. They are
relative, i.e. going along with the setpoint S1 of the
refrigerating chamber. Alarm is released when
exceeding maximum limit value or when falling
below the minimum limit value:
The actual value display flashes, the buzzer (if
available) goes off intermittently and the actual
temperature of sensor F1 is indicated (if there is no
sensor error).
At A1=0 or A2=0 the respective limit value alarm is
inactive.
The buzzer can be turned off with the DOWN key,
the display continues flashing until the alarm is
turned off.
A3: Alarm suppression time after “cooling on”
After switching cooling on, an alarm is suppressed
for the adjusted time, i.e. the refrigerant plant can
get to work temperature without releasing alarm.
A6: Alarm suppression time after temperatu re
alarm
If the refrigerating chamber temperature exceeds the
limit values adjusted at A1, A2, normall y a
temperature alarm should be released.
With the suppression time set at A6 the alarm
release can be delayed.
A7: Alarm suppression time after defrosting
Temperature alarm is avoided for the adjusted time
after defrosting, in order to enable the plant t o get
back to the normal operating conditions (see A1,
A2).
A9: Switching sense alarm exit
Depending on application, the alarm exit requires a
normally-closed or a normally-open contact. At
setting A9=1 the relay tightens in normal operation
and opens in the case of emergency. That way also
a voltage failure of the controller can be detected
(relay dead = alarm) for an external alarm chain.
F4: Defrosting behaviour
At F4=0 the ventilator is switched off during
defrosting.
At F4=1 the ventilator continues to run also during
defrosting (normal cooling range above 0°C).
F5: Ventilator deceleration time afte r defrosting
Following drainage time d7, start of the ventilator
can be delayed until the evaporator has sufficiently
cold air again. If the ventilator started immediately,
the warm air resulting from the defrosting process
would probably be blown into the refrigerating
chamber.
Order No.: 900220.020 V2.24 8/11
F7: Ventilator function at cooling operation
At F7=1 the ventilator is always on (except possibly
for a defrosting process, see parameter F4).
At F7=2 the ventilator is always on or off together
with the compressor.
At F7=3 the ventilator is switched on whenever the
compressor is on and the evaporator temperature
(sensor F2) is below the refrigerating chamber
temperature (sensor F1). The ventilator is switched
off whenever the evaporator is switched off, whereas
parameter F5 is not active. In the case of sensor
error the ventilator reacts as in the setting F7=2.
F8: Ventilator revolution number at normal
cooling operation
This parameter determines the ventilator revolution
number at normal cooling operation.
F9: Ventilator revolution number at de frosting
This parameter determines the ventilator revolution
number at defrosting.
F10: Kick-start (in seconds)
If necessary, this is an option to set a time during
which the ventilator starts with the maximum number
of revolutions for stable operation. This parameter is
only efficient, if the ventilator is newly started.
b1: Function key A
b2: Function key B (if available)
At setting = 0 the respective key has no function.
At setting = 1 the controller is switched to standby
mode
At setting = 2 the key is linked with the function
“setpoint Y1 for the thermostat 2 indicate/adjust”
At setting = 3 a relay (indicated with parameter Ux)
can be switched on or off directly with the key. In
standby mode the key is locked and the
corresponding relay switched off. After restarting the
corresponding relay remains switched off.
At setting = 4 a relay (indicated with parameter Ux)
is switched despite of the standby mode. The
condition of the exit is maintained until the key is
pressed again or until it is changed by an external
switching entrance. After net interruption, the
condition before power failure is re-installed.
At setting = 5 the actual value of sensor 2 can be
indicated. At setting P4=0 the key has no function.
b3: Function key 3 (standby)
At setting b3=0 the function of the key can be
deactivated.
b11: Function external entrance E1
b12: Function external entrance E2
b13: Function external entrance E3
b14: Function external entrance E4
Depending on existing hardware there are no or not
all external entrances.
At setting = 1 the controller is switched to the
standby mode.
At setting = 2 defrosting of both controllers is started.
At setting = 3 a relay (indicated with parameter Ux)
is switched on or off directly. In standby mode it is
locked and the relay is switched off.
At setting = 4 a relay is switched directly (indicated
with parameter Ux) regardless of the standby mode.
After net interruption the condition before power
failure is re-installed.
U1: Exit connection K1
U2: Exit connection K2
U3: Exit connection K3
U4: Exit connection K4
Depending on existing hardware there may not be
all output relays. This parameter assigns the
respective relay to the internal controller exits, to
function key 1 or 2, to one external entrance or the
buzzer.
At setting =6 or =7 the relay is switched manually. It
changes its condition with each pressure of the key
and adopts the condition of the respective switching
entrance whenever the latter changes. If the
corresponding key or switching entrance has not
been released for this function (see parameters b1,
b2 and b11 to b14), the relay remains switched off.
The buzzer connection in its function is comparable
to the alarm connection. The buzzer, however, can
be switched off with the DOWN key.
L0: Own ST-Bus address
Reserved for ST-Bus
L40 :Mask for Low-Byte of Status 0 (ST-Bus)
Reserved for ST-Bus
Pro: Program version
This parameter shows the program version.
Order No.: 900220.020 V2.24 9/11
Status messages
Message
Cause
Error elimination
ON/OFF
Standby modus, no regulation
Switch on by key or switching input
Temperature
Refrigerating chamber temperature
(parameter A1, A2)
E0
Refrigerating chamber sensor F1 error,
Control sensor.
parameter c3.
E1
Sensor F2 error,
Control sensor.
At setting [c3=2] see parameter Y6.
EP
Data loss at parameter memory (basic
contact 1 and 2 are dead)
If error cannot be eliminated by switching
on/off, the controller must be repaired.
indication flashes
flashes
flashes
beyond alarm limits
break or short-circuit
break or short-circuit
Controller operates according to with
At setting [c3=1] the controller operates in
timed defrosting modus (defrosting time
as set in d3).
Error message E0, E1 and EP changes in the display with the actual value of sensor F1, unless the latter is
defective. This happens independently from the selected indication mode. After the error is eliminated and
confirmed with the DOWN key, the previously set indication mode becomes active again.
If there is a connection to the buzzer with parameters U1... U4, the buzzer can be switched off with the
DOWN key.
Order No.: 900220.020 V2.24 10/11
Technical data of ST501-KU3KA.12P
Measuring input
F1: Temperature sensor, refrigerating chamber
F2: Temperature sensor, evaporator
Measuring range: PTC (KTY81-121) -50°C...+130°C
PT1000 -99°C...+300°C
NTC -40°C...+105°C
Pt100 -80°C...+400°C (resistance < 1 Ohm)
Accuracy: ±0.5K ± 0.5 % at 25°C, without sensor
±1K ± 0.5 % of scale range (0 – +55°C), without sensor
Outputs
K1: Relay, 30(6)A 250V~, normally-open contact, function see U1,
permanent current max. 16(6)A, limited by connectors and/or conductive strips
K2: Relay, 16(2.2)A 250V~, normally-open contact, function see U2
K3: Relay, 16(2.2)A 250V~, normally-open contact, function see U3
K4: Relay, 16(2.2)A 250V~, normally-open contact, fan
voltage output for DC-fan: 0..24V, max. 800mA (corresponds 20W)
Display
One 3-digit LED-Display, height 13 mm, for temperature indication
Three LEDs, diameter 3mm, for status display of the outputs
Power supply
230V 50/60Hz, power consumption max. 40 VA
Connectors
Cage clamp 5 x 3-pole, for cable up to 2.5mm²
Cage clamp 1 x 6-pole, for cable up to 1.5mm²
Ambient conditions:
Storage temperature: -20...+70°C
Operating temperature: 0...+55°C
Relative humidity: max. 75% without dew
Weight
ca. 500g, without sensor
Enclosure
Front IP65, IP00 from back
Installation data
The unit is to be installed in an instrument panel.
Front size: 106 x 68 mm
Installation depth: ca. 60 mm with connector
Power plate: 100 x 160mm
Order No.: 900220.020 V2.24 11/11
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