ST RE71 User manual

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temperature controller
RE71
user’s manual

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CONTENTS
1. APPLICATION ................................................................... 5
2. CONTROLLER SET .............................................................. 5
3. BASIC REQUIREMENTS, OPERATIONAL SAFETY .......................... 6
4. INSTALLATION .................................................................. 6
4.1. Controller Installation ............................................................6
4.2. Electrical Connections ..........................................................8
4.3. Installation Recommendations ..............................................9
5. STARTING TO WORK ......................................................... 10
6. SERVICE ........................................................................ 10
6.1. Programming Controller Parameters ..................................12
6.2. Programming Matrix ............................................................13
6.3. Setting Change ...................................................................14
6.4. Parameter Description ........................................................14
7. CONTROL ....................................................................... 17
7.1. ON-OFF Algorithm ..............................................................17
7.2. Innovative SMART PID algorithm ........................................18
8. ALARMS ........................................................................ 20
9. ADDITIONAL FUNCTIONS .................................................... 21
9.1. Displaying the controller signal ..........................................21
9.2. manual Control ....................................................................22
9.3. Manufacturer’s Setting ........................................................22
10. ERROR SIGNALLING .......................................................... 23
11. TECHNICAL DATA ............................................................. 24
12. KONTROLLER EXECUTION CODES .......................................... 27
13. MAINTENANCE AND GUARANTEE ........................................... 29

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1. APPLICATION
The RE71 controller is destined for the temperature control in plastics,
food, dehydration industries and everywhere when the temperature sta-
bilizing is necessary.
Main features of the RE71 controller:
ldirect co-operation with resistance thermometers (RTD) or thermo-
couple (TC) sensors,
ltwo-stage control acc. to the PID or ON-OFF algorithm,
lone control output or alarm, relay output with make-and-break
configuration, allowing to the direct control of low power objects
An innovative SMART PID algorithm has been implemented in the
controller.
2. CONTROLLER SET
The delivered controller set is composed of:
1. RE71 controller ................................................ 1 pc
2. Plug with 6 screw terminals............................. 1 pc
3. Plug with 8 screw terminals............................. 1 pc
4. Screw clamp to fix the controller in the panel... 4 pcs
5. Seal.................................................................. 1 pc
6. User’s manual.................................................. 1 pc
When unpacking the controller, please check whether the type and ex-
ecution code on the data plate correspond to the order.

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3. BASIC REQUIREMENTS,
OPERATIONAL SAFETY
In the safety service scope, the controller meets to requirements of the
EN 61010-1 standard.
Observations Concerning the Operational Safety:
· All operations concerning transport, installation, and commissioning
as well as maintenance, must be carried out by qualified, skilled
personnel, and national regulations for the prevention of accidents
must be observed.
· Before switching the controller on, one must check the correctness
of connections to the network.
· The removal of the controller casing during the guarantee contract
period may cause its cancellation.
· The controller fulfills requirements related to electromagnetic
compatibility in the industrial environment
· When connecting the supply, one must remember that a switch or
a circuit-breaker should be installed in the room. This switch should
be located near the controller, easy accessible by the operator, and
suitably marked as an element switching the controller off.
· Non-authorized removal of the casing, inappropriate use, incorrect
installation or operation, creates the risk of injury to personnel or
meter damage.
For more detailed information, please study the User’s Manual.
4. INSTALLATION
4.1. Controller Installation
Fix the controller in the panel, which the thickness should not exceed
15 mm, by means of four screw clamps acc. the fig. 1.

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Fig. 1. Controller fixing
Fig. 2. Controller overall dimensions
The panel cut-out should have 45+0,6 x 45+0,6 mm dimensions.
The controller must be introduced from the panel front with disconnec-
ted supply voltage. Before the insertion into the panel, one must check
the correct placement of the seal.
After the insertion into the hole, fix the controller by means of screw
clamps.
Controller overall dimensions are presented on the fig. 2.

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4.2. Electrical Connections
Make electrical connections to terminal strip and next, insert strips
into the controller sockets.
The controller has two separable terminal strips. One strip enables
the connection of the supply and outputs by a wire of 2.5 mm2cross-
section, the second strip enables input signal connections by a wire
of 1.5 mm2cross-section.
Fig. 3. View of controller connection strips.
RTD Pt100,
in 2-wire system
RTD Pt100,
in 3-wire system
thermocouple
Fig. 4. Connection of input signals.

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Fig. 5. Connection of the supply and load circuit.
Supply Output - Relay Output – binary voltage
vor SSR control
4.3. Installation Recommendations
In order to obtain a full fastness against electromagnetic noise in an
environment with unknown noise level, it is recommended to observe
following principles:
– do not supply the controller from the network, in the proximity of
devices generating high pulse noise and do not apply common
earthing circuits,
– apply network filters,
– apply metallic shields in the shape of tubes or braids to conduct
supplying wires,
– wires leading measuring signals should be twisted in pairs, and for
resistance sensors in 3-wire connection, twisted of wires of the same
length, cross-section and resistance, and led in a shield as above,
– all shields should be one-side earthed or connected to the protec-
tion wire, the nearest possible to the controller,
– apply the general principle, that wires leading different signals
should be led at the maximal distance between them (no less than
30 cm), and the crossing of these groups of wires made at right
angle (90°).

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5. STARTING TO WORK
After switching the supply on, the controller carries out the display test,
displays the re71, inscription, the program version and next, displays
the measured value.
A character message informing about abnormalities may appear on the
display (table 4). The On-Off control algorithm with hysteresis given in
the table 2 is set by the manufacturer.
Changing the Set Value
The set point value is displayed after pressing the or the
button, then the SP diode is lighting. In order to change the set value,
one must press the or button again (fig. 6). The beginning
of the change is signaled by the dot flickering on the display. One must
accept the new set point value by the button in the laps of 30
seconds from the last pressure of the or button, in the
opposite case, the controller transits to display the measured value with
the previously set up set point value.
Fig. 6. Change of the set value.
6. SERVICE
The controller service is presented on the Fig. 7.

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Fig. 7. Menu of controller service.

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6.1. Programming Controller Parameters
The pressure and holding down the button during ca 2 seconds
causes the entry in the programming matrix. The programming matrix
can be protected by an access code. In case when giving a wrong
value of the code, it is only possible to see settings through – without
possibility of changes.
The fig 8. presents the transition matrix in the programming mode. The
transition between levels is carrying out by means of the and
buttons and the level choice by means of the button.
After choosing the level, the transition between parameters is carried
out by means of and buttons. In order to change the
parameter setting, one must proceed acc. to the section 6.3. In order
to exit from the selected level, one must transit between parameters
until the symbol [. . .] appears and press the button. In order
to exit from the programming matrix to the normal working mode, one
must transit between levels until the symbol [. . .] appears and press
the button.
Some controller parameters cannot be visible – it depends on the cur-
rent configuration.
The table 1 includes the description of parameters. The return to the
normal working mode follows automatically after 30 seconds since the
last button pressure.

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inp
Input
parameters
dp
Position of
decimal point
sHif
Shift of measu-
red value
. . .
Transition
to the higher
level
outp
Output
parameters
out
Output confi-
guration
. . .
Transition
to the higher
level
ctrl
Control
parameters
alg
Control
algorythm
type
Kind of control
Hy
Hysteresis
. . .
Transition
to the higher
level
pid
PID
parameters
pb
Proportional
band
ti
Integration
time constant
td
Differentation
time constant
y0
Working point
for P/PD
to
Pulsing
period
. . .
Transition
to the higher
level
alar
Alarm
parameters
aLsp
Set value vor
the absolute
alarm
aLdu
Deviation from
the set value
of the relative
alarm
aLHy
Alarm
hysteresis
. . .
Transition
to the higher
level
spp
Set value
parameters
spl
Lower limita-
tion of the set
value setting
spH
Upper limita-
tion of the set
value setting
. . .
Transition
to the higher
level
seru
Service
parameters
seCU
Acces code
sTfn
Autotuning
function
. . .
Transition
to the higher
level
. . .
Exit from
the menu
6.2. Programming Matrix
Fig. 8. Programming Matrix

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6.3. Setting Change
The change of parameter setting begins after pressing the but-
ton during the display of the parameter name. The setting choice is
carried out through and buttons, and accepted by the
button. The change cancellation follows after the simultaneous
pressure of and buttons or automatically after 30 sec
since the last push pressure.
The way to change the setting is shown on the fig. 9.
Fig. 9. Setting change of number and text parameters
6.4. Description of Parameters
The list of parameters in the menu is presented in the table 1.

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List of configuration parameters Table 1
Parameter
symbol Parameter description Manufactu- rer setting
Change range of the
parameter
inp – Input parameters
dp Position of the decimal
point 1-dp
0_dp:without decimal
point
1_dp:1 decimal
point
shif Shift of the measured
value 0.0 -99.9...99.9°C
outp – Output parameters
out Output configuration y
off: control switched off
Y: control signal
AHi: upper absolute
alarm
Alo: lower absolute
alarm
dwHi: upper relative
alarm
dwlo: lower relative
alarm
dwin: internal relative
alarm
dwou: external relative
alarm
ctrl – Control parameters 1)
alg Control algorithm oNof
oNof: On-Off control
algorithm
pid: PID control
algorithm
type Kind of control inu
dir: direct control
(cooling)
inu: reverse control
(heating)
Hy Hysteresis 4) HY_FABR 6) 0.2...99.9°C

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pid – Parameters PID 2)
pb Proportional band PB_FABR 6) 0.1...999.9°C
ti Integration time constant 300 0...9999 s
td Differentiation time constant 60.0 0...999.9 s
y0 Correction of control signal
for P or PID control type 0.0 0...100.0%
to Pulse period 20.0 0.5...99.9 s
alar – Alarm parameters 3)
aLsp Set point value for absolute
alarm 0.0 MIN...MAX 6)
aLdu Deviation from the set value
for the relative alarm 0.0 -199.9...199.9°C
aLHy Hysteresis for the alarm 2.0 0.2...99.9°C
spp – Parameters of set point value
spl Lower limitation of the set
value -199.0 MIN...MAX 6)
spH Upper limitation of the set
value 850.0 MIN...MAX 6)
serp – Service parameters
seCU Access code 5) 0 0...9999
sTfn Autotuning function on off: locked
on: available
1) Group of parameters visible only when setting the output on the control signal.
2) Group of parameters visible only when setting the control algorithm on PID.
3) Group of parameters visible only when setting the output on one of the alarm.
4) Parameter visible only when setting the control algorithm on On-Off.
5) Parameter hidden in the monitoring mode of parameters only for readout.
6) Vide table 2.

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7. CONTROL
7.1. On-Off Control
When a high accuracy of temperature control is not required, especially
for objects with a high time constant and not big delay, one can apply
the On-Off control with hysteresis.
Features of this method are simplicity and reliability. Disadvantage of
this method is the occurrence of oscillations, even at small hysteresis
values.
Fig. 10. Operation way of the heating output type for the On-Off control.
Parameters depending on the measured range table 2
Sensor MIN MAX PB_FABR HY_FABR
Resist. thermom. Pt100 -50...100°C-50.0 100.0 15.0 1.1
Resist. thermom. Pt100 0...250°C0.0 250.0 20.0 1.8
Resist. thermom. Pt100 0...600°C0.0 600.0 30.0 4.2
Thermocouple of J 0...250°C0.0 250.0 20.0 1.8
Thermocouple of J 0...600°C0.0 600.0 30.0 4.2
Thermocouple of J 0...900°C0.0 900.0 40.0 6.3
Thermocouple of K 0...600°C0.0 600.0 30.0 4.2
Thermocouple of K 0...900°C0.0 900.0 40.0 6.3
Thermocouple of K 0...1300°C0 1300 45.0 9.1
Thermocouple of S 0...1600°C0 1600 50.0 11.2

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7.2. PID Control
When we want to obtain a higher accuracy of temperature control, one
must use the PID algorithm.
The applied innovative SMART PID algorithm is characterized by an
increased accuracy for the expanded range of control object classes.
The fine tuning of the controller to the object consists on the settlement
of the proportional element, integration element, differentiation element
and output pulsing period.
7.2.1. Autotuning
The controller has the function enabling the choice of PID settings. The-
se settings ensure the optimal control in most of cases.
To begin the autotuning, one must transit to the tune parameter (acc.
to the fig. 7) and hold down the button during at least 2 sec. If
the control algorithm is set on ON-OFF or the autotuning function is
locked, then the tune message is hidden.
The flickering AT symbol informs about the activity of the autotuning
function. The autotuning duration time depends on dynamic properties
of the object and can last maximally 10 hours. During the autotuning or
directly after it, over-regulations can occur and for these reasons, one
must set a less setpoint value, if it possible.
The autotuning is composed of following stages:

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The autotuning process will be broken without PID settings calculations,
if a controller supply decay occurs or the . button is pressed. In
such a case, the control with current PID settings will begin.
If the autotuning experiment does not end with success, then an error
code will be displayed acc. to the table 3.
Error codes for autotuning Table 3
Error code Reason Proceeding
eS01 P lub PD control has been
chosen.
One must choose PI, PID
control, i.e. the TI unit must be
higher than zero.
eS03 The button has been
pressed pressed .
eS04 The maximal autotuning dura-
tion time Has been exceeded. Check, if the temperature sen-
sor is correctly situated, if the
set point value is not set too
higher for the given object.
eS05 The waiting time of switching
has been exceeded.
eS06 The input measuring range has
been exceeded.
Take note of the way to con-
nect the sensor. Do not admit
that the overflow results in
exceeding of the input mea-
suring range.
eS20
Very non-linear object, unab-
ling to obtain correct values of
PID parameters, or an interfe-
rence has occurred.
Carry out the autotuning
again. If that does not help,
choose PID parameters
manually.
eS01
eS03
eS04
eS05
eS06
eS20

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8. ALARMS
One can configure the controller output as an alarm output. For this aim,
one must set the out parameter as one of alarms.
Available types of alarms are given on the fig. 11.
Absolute upper
(out = AHi)
Absolute lower
(out = Alo)
Relative upper
(out = duHi)
Relative upper
(out = duHi)
7.2.2. Proceeding Way in Case of an Unsatisfactory
PID Control
It is recommended to choose PID parameters, changing the value in a
twice higher or twice less. During the change, one must respect follo-
wing principles.
a) Slow response of the jump:
– decrease the proportional band,
– decrease the integration and differentiation time.
b) Over-regulations
– increase the proportional band,
– increase the differentiation time.
c) Oscillations
– increase the proportional band,
– increase the integration time,
– decrease the differentiation time.
d) Instability
– Increase the integration time.