PMA KS 50-1 User manual

KS50-1
KS50-1
KS52-1
KS52-1
PMA Prozeß- und Maschinen-Automation GmbH
Industrial controller KS 50-1and KS 52-1
Operating manual
English
9499-040-62811
Valid from: 07/2011

© PMA Prozeß- und Maschinen-Automation GmbH •Printed in Germany
All rights reserved. No part of this document may bereproduced or published in any form
or by any means without prior written permission from the copyright owner.
A publication of PMA Prozeß- und Maschinen Automation
P.O.Box 310229
D-34058 Kassel
Germany
ûBlueControl
More efficiency in engineering,
more overview in operating:
The projecting environment for the BluePort®controllers
ATTENTION!
Software and Updates on
or on PMA-CD
www.pma-online.de
Description of symbols
in the text: on the device:
gGeneral information aFollow the operating instructions
aGeneral warning
lAttention: ESD-sensitive devices

KS50/52-1 3
Contents
1Mounting .............................. 5
2Electrical connections ....................... 7
2.1 Connecting diagram......................... 7
2.2 Connecting diagram for the options card ..............8
2.3 Terminal connection ........................ 8
3Operation ............................. 12
3.1 Front view ............................. 12
3.2 Behaviour after power-on ..................... 13
3.3 Operating level .......................... 13
3.4 Maintenance manager / Error list ................14
3.5 Self-tuning ............................. 16
3.5.1 Preparation before self-tuning ......................16
3.5.2 Self-tuning start ............................17
3.5.3 Self-tuning cancellation ........................17
3.5.4 Acknowledgement of failed self-tuning .................17
3.5.5 Optimization after start-up or at the set-point ..............17
3.5.6 Selecting the method ( ConF/Cntr/tunE).............18
3.5.7 Optimization at the set-point for 3-point stepping controller ......21
3.5.8 Examples for self-tuning attempts ..................22
3.6 Manual tuning ........................... 23
3.7 Second PID parameter set ..................... 24
3.8 Alarm handling .......................... 25
3.9 Operating structure ........................ 27
4Configuration level ........................ 28
4.1 Configuration survey ....................... 28
4.2 Configurations ........................... 29
4.3 Set-point processing ........................ 38
4.3.1 Set-point gradient / ramp ........................38
4.4 KS50-1 cooling functions ..................... 38
4.4.1 Standard ( CyCl=0)..........................38

4 KS50/52-1
4.4.2 Switching attitude linear ( CyCl=1) ................39
4.4.3 Switching attitude non-linear ( CyCl=2)..............39
4.4.4 Heating and cooling with constant period ( CyCl=3)........40
4.5 Configuration examples ...................... 41
4.5.1 On-Off controller / Signaller (inverse) .................41
4.5.2 2-point and continuous controller (inverse) ...............42
4.5.3 3-point and continuous controller ...................43
4.5.4 3-point stepping controller (relay & relay) ...............44
4.5.5 D-Y - Off controller / 2-point controller with pre-contact......45
4.5.6 KS50-1 with measured value output ..................46
5Parameter setting level ...................... 48
5.1 Parameter survey ......................... 48
5.2 Parameters ............................. 49
5.3 Input scaling ............................ 52
5.3.1 Input Inp.1 ...............................52
5.3.2 Input InP.2 ...............................52
6Calibration level ......................... 53
7Programmer ........................... 56
8Special functions ......................... 57
8.1 Start-up circuit ........................... 57
8.2 Boost function ........................... 58
8.3 KS50/52-1 as Modbus master ................... 59
8.4 Linearization............................ 60
9BlueControl ............................ 61
10 Versions .............................. 62
11 Technical data .......................... 64
12 Safety hints ............................ 67
12.1 Reset to default .......................... 69

1Mounting
Safety switch:
For access to the safety switches, the controller must be withdrawn from the hou-
sing. Squeeze the top and bottom of the front bezel between thumb and forefinger
and pull the controller firmly from the housing.
Mounting
KS50/52-1 5
oder:
*
Ü
*
Ü
96 (3.78")
48 (1.89")
min.48 (1.89")
10 (0.4")
1..10
(0.04..0.4")
118 (4.65")
45
+0,6
(1.77" )
+0.02
92
+0,8
(3.62" )
+0.03
125
126
SP.X run
Err
Ada
è
KS 50-1 KS 52-1 92+0,8
92
+0,8
96
96
10
118
1 2 3 OK
SP.x
run
Ada
Err
%
max.
95% rel.
max. 60°C
0°Cmin.
Safety switches
Loc
10V imA/Pt
UiI

aSafety switch 10V imA/Pt and U<-> I always in position left or right.
Leaving the safety switch open may lead to faulty functions!
lCaution! The unit contains ESD-sensitive components.
Mounting
6 KS50/52-1
Name of safety
switch Position Remark Factory setting
10V imA/Pt right Current signal / Pt100 / thermocouple at
InP.1
l
left Voltage signal at InP.1
Loc open Levels as set using the BlueControl®eng. tool
(default):
- Access to controller off / self-tuning / extended
operating level = enabled
- Password PASS=OFF
- Access to parameter setting level /
configuration level /
calibration level= disabled
close all levels accessible wihout restriction l
U<-> I
only valid for
KS5.-1.4-.....-...
KS5.-1.5-.....-...
right (I) Current / logic on output 3 "OUT3" l
left (U) Voltage on output 3 "OUT3"

2Electrical connections
2.1 Connecting diagram
Electrical connections for all types KS 5x-1 exept KS 5_-1_4-_ 00_ _-_ _
Electrical connections for KS 5_-1_4-_____-__
* Safety switch 10VimA/Pt (input INP1 current”10V” imA/Pt/mV)
** Safety switch U iI (output OUT3 current”U” ivoltage”I”)
Electrical connections
Connecting diagram 7 KS50/52-1
L
N
90...250V
24V AC/DC
mA
mA
0..10 V
HC
di1
INP1
INP2
OUT3
OUT2
OUT1
1
2
3
4
7
5
8
6
9
10
11
12
13
14
15
ab c d
U
Logic KS 5_-1. -.....-...
KS 5_-1. -.....-...
2
3
C
N/O
N/O
C
N/O
N/C
L
N
90...250V
24V AC/DC
mA 0..10 V
di1
INP1
OUT3
OUT2
OUT1
1
2
3
4
7
5
8
6
9
10
11
12
13
14
15
ab c d
U
Logic
C
N/O
N/C
N/O
C
N/C

2.2 Connecting diagram for the options card
gAccording to order the controller is fitted with:
wflat-pin terminals combined for 1 x 6,3mm or 2 x 2,8mm to DIN 46 244
wor screw terminals for conductor cross section from 0,5 to 2,5mm²
On instruments with screw terminals, the stripping length must be min. 12
mm. Select end crimps accordingly.
2.3 Terminal connection
Power supply connection 1
See chapter 11 "Technical data"
Connection of input INP1 2
Input for variable x1 (process value)
athermocouple
bresistance thermometer (Pt100/ Pt1000/ KTY/ ...)
ccurrent (0/4...20mA)
dvoltage (0/2...10V) *Note: consider the safety switches.
Electrical connections
KS50/52-1 8 Connecting diagram for the options card
di2
di3
UT
Option
RXD-B
GND
RXD-A
TXD-B
TXD-A
RS485 RS422
Modbus RTU
RGND
DATA B
DATA A
+24V DC
24V GND
1
2
3
4
7
5
8
6
9
10
11
12
13
14
15
1
3
4
5
6
7
8
9
10
11
12
13
14
15
17
(2)
(16)
OUT5
OUT6
24 VDC
24 VDC
KS5_-1..- ....-...8

Connection of input INP2 3
Sensor type 0...50mA AC or
0/4 ... 20 mA DC for heating current input,
external set-point or
external correcting variable Y.E.
Connection of input di1 4
Digital input, configurable as a switch direct /
inverse or a push-button. ***
Connection of outputs OUT1/2 5
Relay outputs 250V/2A normally open with
common contact connection
Connection of output OUT3 6
Relay-output
KS5_-1_0-_00_ _-_ _ _ or
KS5_-1_1-_00_ _ -_ _ _
-Relay (250V/2A), potential-free changeover contact
Universal-output
KS5_-1_2-_00_ _-_ _ _or
KS5_-1_3-_00_ _-_ _ _
- Current (0/4...20mA)
- Voltage (0/2...10V)
- Transmitter power supply
- Logic (0..20mA / 0..12V)
Connection of inputs di2/3 7(option)
Configurable as a switch direct / inverse
or as a push-button. ***
- Opto-coupler input
KS5_-1_ _-100_ _-_ _ _
Digital inputs (24VDC external)
galvanically isolated.
- Potential-free contact input
KS5_-1_ _-800_ _-_ _ _
Connection of output UT8(option)
Supply voltage connection for external energization
Connection of outputs OUT5/6 9
(option)
Digital outputs (opto-coupler), galvanic isolated, common positive control volta-
ge, output rating: 18...32VDC
Connection of bus interface 0(option)
RS422/485 interface with Modbus RTU protocol
*** Adjustment is possible only in common for all digital inputs.
Electrical connections
Terminal connection 9 KS50/52-1
1
2
3
4
7
5
8
6
9
10
11
12
13
14
15
L
N
Logic
+
_
SSR
3INP2 current tansformer
1
2
3
4
7
5
8
6
9
10
11
12
13
14
15
L
N
+
5OUT1/2 heating/cooling

Connection of outputs OUT1 !and OUT2 "
Relay-output KS5_-1_4-_00_ _-_ _ _ and KS5_-1_5-_00_ _-_ _ _
-Relay (250V/2A), potentialfree changeover contact
Connection of output OUT3 §
Universal output KS5_-1_4-_00_ _-_ _ _und KS5_-1_5-_00_ _-___
Note: Mind the safety switch.
- current (0/4...20mA)
- voltage(0/2...10V)
- Transmitter power supply
- Logic (0..20mA / 0..12V)
aThe analog outputs OUT3 and transmitter supply voltage UTare connected to
different voltage potentials. For this reason, an external galvanic connection of
OUT3 and UTis not permissible for analog outputs.
Electrical connections
KS50/52-1 10 Terminal connection
1
2
3
K
+
-
+
-
13V
22mA
6OUT3 transmitter supply
1
3
4
5
6
7
8
9
10
11
12
13
14
15
17
(2)
(16)
1
2
3
4
7
5
8
6
9
10
11
12
13
14
15
1
2
3
K
+
-
+
-
+
-
17,5V
22mA
OUT3
Jx
82-wire transmitter supply with UT
Option KS5_-1_ _-100 _ _-_ _ _
1
2
3
4
5
+24VDC
5mA
5mA
0V
Option KS5_-1_ _-800 _ _-_ _ _
1
2
3
4
5
7Connection of inputs di 2/3
7
8
9
7
8
9
3
4
7
5
8
6
9
10
+
_
SSR
+
_
SSR
+
_
SSR
Series connection Parallel connection
+
_
SSR
7
8
9
Logic
4V
4V
4V
12V
I =22mA
max
I =22mA
max
12V
6OUT3 as logic output with solid-state relay
(series and parallel connection)

****see Interface description Modbus RTU 9499-040-63611 .
KS5_-1_2-_00_ _-_ _ _. connecting example:
aCAUTION: Using a temperature limiter is recommendable in
systems where overtemperature implies a fire hazard or
other risks.
Electrical connections
Terminal connection 11 KS50/52-1
12
13
14
15
17
(16)
11
12
13
14
15
10
12
13
14
15
17
(16)
11
12
13
14
15
10
12
13
14
15
17
(16)
11
12
13
14
15
RGND RGND RGND
RT
converter
RS485-RS232
PC
DATA A
DATA B
DATA A
DATA B
DATA A
DATA B
J
max. 1000m
”Twisted Pair”
10
RT
R=100 Ohm
RGND connection optional
R = 120...200 OhmT
R = 120...200 OhmT
0RS485 interface (with RS232-RS485 interface converter) ****
1
2
3
4
7
5
8
6
9
10
11
12
13
14
15
Logic
+
_
L1
L2
N1
N2
fuse
1
2
3
4
7
5
8
6
9
10
11
12
13
14
15
TB 40-1
Temperature limiter
1
KS 5_-1
SSR
reset
contactor
heating
1TB 40-1 Temperature limiter
Standard version (3 relays):
TB40-100-0000D-000
other versions on requestr
++
fuse fuse

3Operation
3.1 Front view
LED colours:
LED 1, 2, 3: yellow
LED OK: green
other LEDs: red
gIn the upper display line, the process value is always displayed. At parameter,
configuration, calibration as well as extended operating level, the bottom display
line changes cyclically between parameter name and parameter value.
Operation
Front view 12 KS50/52-1
KS 50-1 universal
125
126.
SP.x run
Err
Ada
123OK
3
%
1
2
3
4
0
5
!
6
"
7
8
§
9
$
%
è
&
&
1For function states /
see LED assignment
(Conf/othr/LEd)
2Lit with limit value 1
(PArA /Lim ) not exceeded
3Process value display
4Set-point, controller output
5Signals ConF and PArA level
6Programmer running
7Self-tuning active
8Entry in error list
9Set-point SP.2 or SP.E is
effective
0Set-point gradient effective
!Manual/automatic switch-over:
Off: Automatic
On: Manual
(changing possible)
Blinks: Manual
(changing not possible
(rConF/Cntr/MAn)
"Enter key:
calls up extended operating
level / error list
§Up/down keys:
changing the set-point or the
controller output value
$Manual mode /spec. function
(®ConF /LOGI )
%PC connection for
BlueControl (engineering
tool)
&Freely programmable function
key

3.2 Behaviour after power-on
After supply voltage switch-on, the unit starts with the operating level.
The unit is in the condition which was active before power-off.
If the controller was in manual mode before power-off, the controller starts with
the last correcting value after switching on again.
3.3 Operating level
The content of the extended operating level is determined by means of BlueCon-
trol (engineering tool). Parameters which are used frequently or the display of
which is important can be copied to the extended operating level.
Operation
KS50/52-1 13 Behaviour after power-on
125
126
y21
126
y21
126
Ò
Ò
Ù
Ù
Ù
Ù
125
126
Automatic
Extended operating level
Manual
i
i
È
Ì
È
Ì
È
Ì
only
display
126
FbF.1 Err 2
126
Err
switching
display
Errorliste (if error exists)
time
out time
out
time
out

3.4 Maintenance manager / Error list
With one or several errors, the extended operating level al-
ways starts with the error list. Signalling an actual entry in
the error list (alarm, error) is done by the Err LED in the
display. This is applicable only, if at least one limit value
function, the loop alarm or the heating current alarm is ac-
tivated. For display of the error list, press Ùtwice.
Err LED status Signification Proceed as follows
blinks
(Status 2)Alarm due to existing
error Determine the error type in the error list after removing the error the device changes to Status1
lit
(Status1)Error removed, Alarm not acknowledged Acknowledge the alarm in the error list pressing key
Èor Ìthe alarm entry is deleted (Status 0).
off
(Status 0)No error, all alarm entries deleted not visible, exept when ackowledging
Error list:
Name Description Cause Possible remedial action
E.1 Internal error,
cannot be removed
E.g. defective EEPROM Contact PMA service
Return unit to our factory
E.2 Internal error, can be
reset
e.g. EMC trouble Keep measurement and power
supply cables in separate runs
Ensure that interference
suppression of contactors is
provided
E.4 Hardware error Codenumber and hardware are
not identical
Contact PMA service
Electronic-/Optioncard must be
exchanged
FbF.1 Sensor break INP1 Sensor defective
Faulty cabling
Replace INP1 sensor
Check INP1 connection
Sht.1 Short circuit INP1 Sensor defective
Faulty cabling
Replace INP1 sensor
Check INP1 connection
POL.1 INP1polarity error Faulty cabling Reverse INP1 polarity
FbF.2 Sensor break INP2 Sensor defective
Faulty cabling
Replace INP2 sensor
Check INP2 connection
Sht.2 Short circuit INP2 Sensor defective
Faulty cabling
Replace sensor INP2
Check INP2 connection
POL.2 INP2 polarity Faulty cabling Reverse INP2 polarity
HCA Heating current
alarm (HCA)
Heating current circuit
interrupted, I< HC.A or I>
HC.A (dependent of
configuration)
Heater band defective
Check heating current circuit
If necessary, replace heater band
SSr Heating current short
circuit (SSR)
Current flow in heating circuit
at controller off
SSR defective
Check heating current circuit
If necessary, replace solid-state
relay
Operation
Maintenance manager / Error list 14 KS50/52-1
125
126
SP.x run
Ada
Err

Name Description Cause Possible remedial action
LooP Control loop alarm
(LOOP)
Input signal defective or not
connected correctly
Output not connected correctly
Check heating or cooling circuit
Check sensor and replace it, if
necessary
Check controller and switching
device
AdA.H Self-tuning heating
alarm
(ADAH)
See Self-tuning heating error
status
see Self-tuning heating error
status
AdA.C Self-tuning heating
alarm cooling
(ADAC)
See Self-tuning cooling error
status
see Self-tuning cooling error
status
LiM.1 stored limit alarm 1 adjusted limit value 1 exceeded check process
Lim.2 stored limit alarm 2 adjusted limit value 2 exceeded check process
Lim.3 stored limit alarm 3 adjusted limit value 3 exceeded check process
Inf.1 time limit value
message
adjusted number of operating
hours reached
application-specific
Inf.2 duty cycle message
(digital ouputs)
adjusted number of duty cycles
reached
application-specific
gSaved alarms (Err-LED is lit) can be acknowledged and deleted with the digital
input di1/2/3, the è-key or the Ò-key or the.
Configuration, see page 36: ConF /LOGI /Err.r
gIf an alarm is still valid that means the cause of the alarm is not removed so far
(Err-LED blinks), then other saved alarms can not be acknowledged and deleted.
Not applicable to heating current alarm.
Error status:
Self-tuning heating ( ADA.H) and cooling ( ADA.C) error status:
Error status Description Behaviour
0No error
3Faulty control action Re-configure controller (inverse idirect)
4No response of process
variable The control loop is perhaps not closed: check sensor, connections and process
5Low reversal point Increase ( ADA.H) max. output limiting Y.Hi or
decrease ( ADA.C) min. output limiting Y.Lo
6Danger of exceeded set-point
(parameter determined) If necessary, increase (inverse) or reduce (direct) set-point
7Output step change too small
({y > 5%) Increase ( ADA.H) max. output limiting Y.Hi or
reduce ( ADA.C) min. output limiting Y.Lo
8Set-point reserve too small Increase set-point (invers), reduce set-point (direct)
or increase set-point range
(rPArA /SEtp /SP.LO and SP.Hi )
9Impulse tuning failed The control loop is perhaps not closed: check sensor,
connections and process
Operation
KS50/52-1 15 Maintenance manager / Error list

3.5 Self-tuning
For determination of optimum process parameters, self-tuning is possible.
After starting by the operator, the controller makes an adaptation attempt, where-
by the process characteristics are used to calculate the parameters for fast line-out
to the set-point without overshoot.
The following parameters are optimized when self-tuning:
Parameter set 1:
Pb1 Proportional band 1 (heating) in engineering units [e.g. °C]
ti1 Integral time 1 (heating) in [s] ronly, unless set to OFF
td1 Derivative time 1 (heating) in [s] ronly, unless set to OFF
t1 Minimum cycle time 1 (heating) in [s]. This parameter is optimized only, unless
parameter Cntr/Adt0 was configured for “no self-tuning” using BlueControl®
Pb2 Proportional band 2 (cooling) in engineering units [e.g. °C]
ti2 Integral time 2 (cooling) in [s] ronly, unless set to OFF
td2 Derivative time 2 (cooling) in [s] ronly, unless set to OFF
t2 Minimum cycle time 2 (cooling) in [s]. This parameter is optimized only, unless
parameter Cntr/Adt0 was configured for “no self-tuning”using BlueControl®
Parameterset 2: according to Parameterset 1 (see page 24)
3.5.1 Preparation before self-tuning
wAs a prerequisite of process evaluation, a stable condition is required. For this
reason, the controller waits, until the process has reached a stable condition
after self-tuning start.
The rest condition is considered as reached, when the process value oscillati-
on is smaller than ±0,5% of (rnG.H -rnG.L). The limits of the control range
must be adjusted for the controller operating range, i.e. rnG.L and rnG.H
must be adjusted to the limits within which control must take place (Configu-
rationrControllerrspan start and end of control range) ConFrCntrr
rnG.L and rnG.H
wFor starting the self-tuning after start-up, a clearance of 10% of (SP.LO...
SP.Hi) is required. As the values PArA/SEtp/SP.LO and
PArA/SEtp/SP.Hi mustl always be within the control range, no restriction
is applicable if these values are adjusted correctly.
wDetermine which parameter set must be optimized.
-The currently effective parameter set is optimized.
ractivate the corresponding parameter set (1 or 2).
wDetermine which parameter must be optimized (see the list given above)
wSelect the method for self-tuning
See Chapter 3.5.6
- Step attempt after start-up
- Pulse attempt after start-up
- Optimization at the set-point
Operation
Self-tuning 16 KS50/52-1

3.5.2 Self-tuning start
gSelf-tuning start can be disabled using BlueControl®(engineering tool)
(Conf/Othr/IAdA).
Starting the self-tuning:
Self-tuning is started by pressing the Ùand Èkeys simultaneously, or via the
interface. If parameter Conf/Cntr/Strt is set to 1self-tuning starts also af-
ter power-on and when detecting process value oscillations.
3.5.3 Self-tuning cancellation
wBy the operator:
Self-tuning is cancelled by pressing the Ùand Èkeys simultaneously.
Switching over to manual operation also causes cancellation of the self-tu-
ning procedure.
After self-tuning cancellation, the controller continues operating using the pa-
rameters valid prior to self-tuning start.
wBy the controller:
If the Err LED starts blinking during self-tuning, successful self-tuning is pre-
vented due to the control conditions. In this case, self-tuning was cancelled
by the controller. The controller continues operating using the parameters va-
lid before self-tuning start.
If the self-tuning method with step attempt was used and self-tuning was
started from the manual mode, the controller uses the last valid correcting va-
riable after self-tuning start, until the self-tuning error message is acknowled-
ged. Subsequently, the controller continues operating using the parameters
valid before self-tuning start.
Causes of cancellation:
®Page 8: " Self-tuning heating (ADA.H) and cooling (ADA.C) error status"
3.5.4 Acknowledgement of failed self-tuning
When pressing the Ùkey, the controller switches over to correcting variable dis-
play (Y....). After pressing the Ùkey again, the controller goes to the error list
of the extended operating level. The error message can be acknowledged by swit-
ching the message to 0 using the Dor the Ikey.
After acknowledging the error message, the controller continues operating in the
automatic mode, using the parameters valid prior to self-tuning start.
Operation
KS50/52-1 17 Self-tuning
Ada-LED-Status Meaning
blinks Waiting until process is at rest
lit seft tuning running
off self tuning not active e.g. ready
Self-tuning status display
125
126
SP.x run
Ada
Err

3.5.5 Optimization after start-up or at the set-point
The two methods are optimization after start-up and at the set-point.
As control parameters are always optimal only for a limited process range, vari-
ous methods can be selected dependent of requirements. If the process behaviour
is very different after start-up and directly at the set-point, parameter sets 1 and 2
can be optimized using different methods. Switch-over between parameter sets
dependent of process status is possible (see page ).
Optimization after start-up: (see page 18)
Optimization after start-up requires a certain separation between process value
and set-point. This separation enables the controller to determine the control pa-
rameters by evaluation of the process when lining out to the set-point.
This method optimizes the control loop from the start conditions to the set-point,
whereby a wide control range is covered.
We recommend selecting optimization method “Step attempt after start-up”
with tunE = 0 first. Unless this attempt is completed successfully, we then re-
commend a “Pulse attempt after start-up”.
Optimization at the set-point: (see page 19)
For optimizing at the set-point, the controller outputs a disturbance variable to the
process. This is done by changing the output variable shortly. The process value
changed by this pulse is evaluated. The detected process parameters are conver-
ted into control parameters and saved in the controller.
This procedure optimizes the control loop directly at the set-point. The advantage
is in the small control deviation during optimization.
3.5.6 Selecting the method ( ConF/Cntr/tunE)
Selection criteria for the optimization method:
Step attempt after start-up Pulse attempt after start-up Optimization at the set-point
tunE =0 sufficient set-point reserve is
provided sufficient set-point reserve is not provided
tunE =1 sufficient set-point reserve is
provided sufficient set-point reserve is not provided
tunE =2 Only step attempt after start-up
required
Sufficient set-point reserve:
inverse controller:(with process value < set-point- (10% of rnGH -rnGL)
direct controller: (with process value > set-point + (10% of rnGH -rnGL)
inverse controller:
process value is (10% of rnGH -rnGL) below the set-point
direct controller:
process value is (10% of rnGH -rnGL) above the set-point
Operation
Self-tuning 18 KS50/52-1

Step attempt after start-up
Condition: - tunE = 0 and sufficient set-point reserve provided or
-tunE =2
The controller outputs 0% correcting variable or Y.Lo and waits, until the process
is at rest (see start-conditions on page 8).
Subsequently, a correcting variable step change to 100% or Y.Hi is output.
The controller attempts to calculate the optimum control parameters from the pro-
cess response. If this is done successfully, the optimized parameters are taken
over and used for line-out to the set-point.
With a 3-point controller, this is followed by “cooling”.
After completing the 1st step as described, a correcting variable of -100% or
Y.Lo (100% cooling energy) is output from the set-point. After successfull deter-
mination of the “cooling parameters”, line-out to the set-point is using the optimi-
zed parameters.
Pulse attempt after start-up
Condition: - tunE = 1 and sufficient set-point reserve provided.
The controller outputs 0% correcting variable or Y.Lo and waits, until the process
is at rest (see start conditions page 8)
Subsequently, a short pulse of 100% or Y.Hi is output (Y=100%) and reset.
The controller attempts to determine the optimum control parameters from the
process response. If this is completed successfully, these optimized parameters
are taken over and used for line-out to the set-point.
With a 3-point controller, this is followed by “cooling”.
After completing the 1st step as described and line-out to the set-point, correcting
variable "heating" remains unchanged and a cooling pulse (100% cooling energy)
is output additionally. After successful determination of the “cooling parame-
ters”, the optimized parameters are used for line-out to the set-point.
Optimization at the set-point
Conditions:
wA sufficient set-point reserve is not provided at self-tuning start (see page 18).
wtunE is0or1
wWith Strt =1configured and detection of a process value oscillation by
more than ±0,5% of (rnG.H -rnG.L) by the controller, the control parame-
ters are preset for process stabilization and the controller realizes an optimiza-
tion at the set-point (see figure “Optimization at the set-point”).
wwhen the step attempt after power-on has failed
wwith active gradient function ( PArA/SETP/r.SP¹OFF), the set-point
gradient is started from the process value and there isn't a sufficient set-point
reserve.
Operation
KS50/52-1 19 Self-tuning

Optimization-at-the-set-point procedure:
The controller uses its instantaneous parameters for control to the set-point. In li-
ned out condition, the controller makes a pulse attempt. This pulse reduces the
correcting variable by max. 20% 1, to generate a slight process value unders-
hoot. The changing process is analyzed and the parameters thus calculated are re-
corded in the controller. The optimized parameters are used for line-out to the
set-point.
With a 3-point controller, optimization for the “heating“ or “cooling” parameters
occurs dependent of the instantaneous condition.
While the controller is in the "heating-phase" the heating-parameters are deter-
mined. If the controller is in the "cooling-phase" the cooling-parameters are
determined.
1If the correcting variable is too low for reduction in lined out condition it is
increased by max. 20%.
Operation
Self-tuning 20 KS50/52-1
set-point
process value
correcting
variable
Optimization at the set-point