United Process Controls PROTHERM 50 User manual

PROTHERM 50
PROTHERM 50
Operating Manual

UNITED PROCESS CONTROLS GMBH Page 1 Protherm 50 P68.230
Contents
Introduction ................................................................................................................................................. 2
Operating mode: Remote or Local.......................................................................................................... 2
Limits ....................................................................................................................................................... 3
Warning - and alarm-system ................................................................................................................... 3
Allocation of system resources ............................................................................................................... 3
Operation .................................................................................................................................................... 5
Structure of the menus ............................................................................................................................... 6
Sub menus ................................................................................................................................................. 7
Overview ................................................................................................................................................. 7
Atm-Overview ......................................................................................................................................... 7
Tmp-Overview......................................................................................................................................... 7
Sensor-Values ........................................................................................................................................ 7
Probe-Purging ......................................................................................................................................... 7
ATM-Controller........................................................................................................................................ 8
Control Variable ...................................................................................................................................... 9
Actuator ................................................................................................................................................. 10
Relay-allocation .................................................................................................................................... 11
IDENT ................................................................................................................................................... 11
TMP-Controller...................................................................................................................................... 11
IDENT ................................................................................................................................................... 13
Measurement Input ............................................................................................................................... 13
Prozess Values ..................................................................................................................................... 14
Foil ........................................................................................................................................................ 15
Correction ............................................................................................................................................. 15
CAN-Bus ............................................................................................................................................... 17
MODBUS .............................................................................................................................................. 18
PROFIBUS ............................................................................................................................................ 19
Warning- and Alarm-Status .................................................................................................................. 20
Warning- and Alarm-Configuration ....................................................................................................... 20
Ext. Analog Inputs ................................................................................................................................. 20
Analog Outputs 1 ..4 ............................................................................................................................. 20
Comparator 1..4 .................................................................................................................................... 21
Access-control ...................................................................................................................................... 22
Options .................................................................................................................................................. 22
O2-actual values ................................................................................................................................... 23
Offsets ................................................................................................................................................... 23
Connection diagram ................................................................................................................................. 24
Option PROFIBUS-DP interface .............................................................................................................. 25
Option RS485 interface with MODBUS-driver ......................................................................................... 26
Mounting-dimensions ............................................................................................................................... 26
Appendix 1: CE-Conformity ...................................................................................................................... 27
This instruction manual is purely informative. The contents are not part of any offer for
sale or contract. The specifications, extensions and options described may differ due to
the actual configuration. UNITED PROCESS CONTROLS GmbH reserves the right to
revise specifications, make modifications and technical changes to the product
described herein without notification.
Protherm 50
Revision: P68.223 E
April 2005

UNITED PROCESS CONTROLS GMBH Page 2 Protherm 50 P68.230
Introduction
PT50 is a measurement and control system for heat-treatment-installations. The device is suitable for
the connection of an O2-probe and offers the following features:
 Local operation by good readable display and press/turn knob, which reaction can be adopted
to the personal wishes of the operator
 local language online selectable between German/English/French
 access protected by two separate password levels for setpoints and configuration.
 The menus for operation and configuration are individually selectable by the service-software.
 operating voltage: 24VDC.
 DIN-cabinet 96x96 with clips and pluggable connections enables exchange without opening the
switch-cabinet.
 Measurement of thermo-voltage and e.m.f. of an O2-probe and calculation of the temperature
TC1 for the thermo-elements PtRh10 (S), PtRh13 (R), (Pt13Rh6(B), from O2-partial pressure,
carbon-potential Cp, carbon-activity aC, KC-value, water-content H2O, nitriding values KN, dew
point TP and carbon-potentials Cpl with usage of a Lambda probe.
 Measurement a second thermo-voltage and calculation of the temperature TC2 for the thermo-
elements PtRh10 (S), PtRh13 (R), (Pt13Rh6(B), NiCrNi (K), NiCrSi (N) and FeCo (J).
 Regulation the furnace-atmosphere, (control variable Cp, KC, O2, LogO2, KN, TP and Cpl) by
means of PID-controller with Autoident-function and two local set points.
 Regulation of TC1 or TC2 by means of PID-controller with Autoident-function and two local set-
points.
 Automatic calculation of the Cp-correction factor from a foil-value.
 Integrated purging automatic for O2-probe.
 Versatile limit-functions with classification in warning- or alarm-messages. Warnings will be de-
leted with disappearance of the cause automatically. Alarms has to be acknowledged.
 5 relay outputs and 3 digital inputs are standard. Inputs and output signals can be assigned to
the functions freely.
 CAN-Bus-Interface for IO- extension is standard.
 Optional MODBUS Interface or PROFIBUS-DP for connection to a process-leading system or
PLC.
 Possible system-extension with CANOpen-compatible IO-modules. 4 analog inputs, 4 analog
outputs, 16 digital inputs and 16 digital outputs can be used additionally. Outputs and inputs can
be assigned to the functions freely.
 Comfortable parameterization and configuration of the device by means of PC through built-in
service-interface. The entire configuration can be uploaded, archived and downloaded. The PC-
Software necessary for this runs under Win98/NT/2000/XP and offers diverse tools for configu-
ration, start-up, diagnosis and services.
 The appliance-software can be updated without opening the casing.
Operating mode: Remote or Local
PT50 can operate in two modes:
Operating
mode
Function
Remote The regulators work with remote-setpoints, which are send by a process leading system
over one of the interfaces. The local setting of a setpoint is not possible.
Local The regulators work with the local setpoints. The process leadings system is able to read
the actual setpoint values, the remote setpoints will be accepted by the controller but will
be ignored.
The selection of the operating modes can be done manually, by a digital input or by process leading
system. (exception: PROFIBUS, here the PLC can read the operating mode, but cannot change it.)

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Limits
PT50 makes four all-purpose limit values available, which can be used as single sided or double sided
limit comparator. The monitored value can be selected from a list of variables, which includes all im-
portant values. The switching threshold can be a fixed value or another value out of the list. With double
sided comparator a tolerance band is possible. The deviation alarm can be delayed and activate a relay
or assigned to a warning or alarm message.
The regulators in the PT50 features also independent relative and absolute limit values.
Warning - and alarm-system
Definition: A warning is a message, which will be automatically deleted after the disappearance of the
cause. Alarms has to be acknowledged by the operator or a process leading system.
Many functions of the PT50 generate limit - or status-messages, which informs the user. In accordance
with the meaning of the individual message, this must either only be taken to the knowledge with further
observation, or an immediate intervention is necessary. Since the situation is different in each case, a
solution was developed where an allocation of every limit or status message to a summary warning or a
summery alarm. A relay can be assigned individually to most of the messages.
A process leading system can read all limit - and status-data in two status-words, independent of their
functionality.
In the following description, functions which generates messages which allocation possibility to warn-
ings or alarms are marked with WA.
Allocation of system resources
Because of the many capabilities of the PT50, a fixed allocation of analogue and digital inputs/outputs
would waste resources. Therefore, these can be assigned to the functions with PT50 individually.
The allocation happens with the configuration of the functions, multiple-allocations are allowed only with
digital inputs.
The resources of the device can be expanded by CANopen – compatible I/O - modules. The corre-
sponding input/outputs are treated like internal resources and appear to the allocation-tables.
Names
Relay
----- No relay assigned
IntRL1 Internally in the PT50 available relays
IntRL2
IntRL3
IntRL4
IntRL5
Gr1RL1 External relays group 1
The allocation depends on the CAN-Bus relay-module
Gr1RL2
Gr1RL3
Gr1RL4
Gr1RL5
Gr1RL6
Gr1RL7
Gr1RL8

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Relay
Gr2RL1 External relays group 2
The allocation depends on the CAN-Bus relay-module
Gr2RL2
Gr2RL33
Gr2RL4
Gr2RL5
Gr2RL6
Gr2RL7
Gr2RL8
Analog input
---- No analogue input assigned
ExtAI1 External analogue inputs
The allocation depends on the CAN-Bus analogue input-module
ExtAI2
ExtAI3
ExtAI4
The electrical value of an analogue input is transformed to a scale from 0% to 100%. In this manner
only the used input module affects the electrical measurement range ( 0 ..20mA, 4 ..20mA, 0 ..10V etc).
The PT50 realizes only every measurement range as 0.100% and scales this in accordance with the
parameterization to physical values (e.g.: 0…100% correspond to 0 ..40%CO ).
Digital Inputs
-----
No digital input assigned
IntD01
PT 50 Internal digital Inputs
IntD02
IntD03
ExtD01
External digital inputs
The allocation depends on the CAN-Bus input-module
.
ExtD02
ExtD03
ExtD04
ExtD05
ExtD06
ExtD07
ExtD08
ExtD09
ExtD10
ExtD11
ExtD12
ExtD13
ExtD14
ExtD15
ExtD16
Important hint:
In no case, PT50 can be responsible alone for security-relevant functions within the total-installation.-
Especially the Safety-related recommendations for the usage of industrial-furnaces with gas-
atmospheres of the AWT committee 8: Accident-prevention in heat-treatment-plants has to be
heeded.

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Operation
The handling of the PT50 takes place over a combined press-turn-button and with the LCD-display. The
language can be switched between German, English and French. Through the hierarchical structure of
the handling with main.- and sub menus, the parameters of every function are easily selectable.
After switch-on the display shows the device name, the software version and the name of the menu
layout. A pressure on the know shows the main menu; turning the know shows the sub menus. With the
pressure of the know the sub menu will be selected. Within the sub menu the selected parameter can
be reached by turning the knob.
The sub menu „back “ leads into the main menu again.
The access to the device is structured in three access-levels:
1. The display-level.
In this level, each parameter can be shown, with exception of the passwords in the Menu „ac-
cess-control “. An alteration of setpoint values or configuration-data is not possible.
2. The setpoint-level.
The setpoint-level allows the display of all parameters exactly like in the display-level, however
the regulator-setpoints and some few values used frequently can be adjusted additionally.
3. The configuration-level.
Additionally to the values of the setpoint-level, all configuration-data and parameters as well as
the passwords of the access-control can be adjusted here.
The selection of the different access-levels takes place in the Menu „options “with the parameter „pass-
word “. There are different passwords for setpoint- and the configuration-level, which can be set in the
configuration-level in the Menu „access-control“. In the delivery status the password is “0” for the set-
point- and “1” for the configuration level.
The password is the only value, which can be entered in the display level. By turning the knob select the
“Password” and press the knob. By turning the knob again select the password for the setpoint- or the
configuration level. With a press on the knob the password is entered.
The different levels have only a limited lifetime, which starts with every user action. When there is no
action within the lifetime, the controller goes to the display level. The lifetime for the configuration level
is fixed to 5 minutes. The lifetime of the setpoint-level can entered in the menu “access control”. With a
value of 0 it is possible to disable the lifetime control.
For the setting of the other values use the same procedure as for entering the passwords.

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Structure of the menus
In accordance with the big function-variety of the PT50, there are many parameters for the adaptation of
the controller to the tasks. To facilitate the survey the parameters of the same functions are merged in
sub menus.
Which submenus are available in each of the main menus can be selected with help of the service-
program on the PC. Therefore it is not possible to describe here a main menu layout, but the table be-
low shows all available sub menus.
Following sub menus can be included in the main menus:
Menu
Function
Font
Overview Actual values of atmosphere- and temperature controller large
Atm-Overview Actual value and setpoint of the atmosphere controller large
Tmp-Overview Actual value and setpoint of the temperature controller large
Sensor-values actual value of e.m.f. and temperature of the O2-probe large
Actual values Display of all calculated values normal
Probe-purging Configuration the probe-purging normal
Atm-controller Configuration of the atmosphere-controller normal
Tmp-controller Configuration of the temperature controller normal
Measurement input Configuration of the measurement inputs normal
Process values Configuration of the process values CO and H2 normal
Foil Input of a foil-value with automatic calculation of the KF normal
Correction Input of the correction-factors and Offsets normal
CAN-Bus Configuration of the CAN-Interface normal
MODBUS Configuration of the optional MODBUS-Interface normal
PROFIBUS Configuration the optional PROFIBUS DP-Interface normal
Warning-status Display of the current warnings normal
Alarm-status Display of the current alarms normal
Warning-config. Configuration the warning-function normal
Alarm-configuration Configuration the alarm-function normal
Ext. Analog-inputs Configuration of the external analog inputs * normal
Analog-output 1 Configuration of the external analog output (channel 1) * normal
Analog-output 2 Configuration of the external analog output (channel 2) * normal
Analog-output 3 Configuration of the external analog output (channel 3) * normal
Analog-output 4 Configuration of the external analog output (channel 4) * normal
Limit 1 Configuration limit 1 normal
Limit 2 Configuration limit 2 normal
Limit 3 Configuration limit 3 normal
Limit 4 Configuration limit 4 normal
Access-control Configuration of the access to the user levels normal
Options different settings and password setting normal
O2-values Display O2 in % and as LogO2 large
Offsets Input of the offsets for US,, TCS, O2% and LogO2 normal
That with * marked functions requires additional CANopen-compatible I/O-Module, which are connect-
ed via CAN-Bus with PT50.

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Sub menus
Overview
Display of the actual values of atmosphere- and temperature controller. Which values are shown, de-
pends on the selection of the control variable.
Atm-Overview
Display and respectively setting of the atmosphere-controller. The displayed setpoint depends on the
operating mode (Local/Remote). In “Local” mode the local setpoint is shown and may be changed. In
“Remote” mode the remote setpoint is display and cannot be changed locally.
To alter the setpoint the PT50 must be in the setpoint- or configuration-level.
Tmp-Overview
Display and respectively setting of the temperature-controller. The displayed setpoint depends on the
operating mode (Local/Remote). In “Local” mode the local setpoint is shown and may be changed. In
“Remote” mode the remote setpoint is display and cannot be changed locally.
To alter the setpoint the PT50 must be in the setpoint- or configuration-level.
Sensor-Values
Display of the e.m.f. (electromotive force) and temperature of the O2-probe.
Probe-Purging
The function probe purging provides a cyclic purging or a purging which is started by a process leading
system. Purging the probe makes only sense with carburizing processes.
During a probe purging, the calculation of the actual value as well as the setpoint of the atmosphere-
controller are frozen in order to minimize the influence of the process through the purging. The values
still remain frozen after completion of the purging for a refresh time, during which the probe can come
back to the correct measurement value again.
Also the measurement of probe voltage and probe-temperature can be frozen additionally.
The values for purging time, refresh time and in the case of the cyclic purging the interval time can be
configured.
Interval
The interval time between two cyclically purging actions in minutes. A “0” means that no cyclic purging
is caused. But a purging can be started from a process leading system or with the service-program.
Delay
With the use of several PT50 at a furnace it may happen that all PT 50 start the purging simultaneously,
because with same interval all devices behave equal after power up. In order to avoid this, a different
value can be set in each PT50 for the delay. Delay [min] is the time, that passes after switching on the
PT50 up to the first cyclic probe-purging. The delay shall 0 or bigger than the sum of purging- and re-
fresh time.
Duration

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Duration of purging time in minutes
Refresh timer
Refresh time in minutes
Measurement enable/hold
The setting MW will hold also the measurements of probe-voltage and probe-temperature.
ATM-Controller
According to selection of the parameters, the algorithm can work as P -, PI -, PD - or PID-controller.
The controller considers the properties of the actuator.
A function for the automatic identification of the control loop is available, which determines the optimal
parameter set.
Two relative-limits are available, whose switching-points can be set to a fixed distance to the setpoint.
debit-value, stand. The effective direction (active on or active off) is selectable.
Two absolute-limits are available, whose switching-points can be set to a fixed value of the control vari-
able. The appropriate relays switch with exceeding of the switch-point (WA).
Act.SP
Display of the effective setpoint (regardless from local/remote mode)
Active local SP
Selection of the local setpoint 1/2. In operating mode Remote, „Remote “ is displayed and the setpoint is
not selectable.
Loc SP1, Loc SP2,
Setting of the local setpoints, which are only effective in local mode.
Cycle
Interval, after which the regulator calculates a new control value.
Xp
Proportional band of the regulator in % the standardization-value.
Ti
Integral element of the regulator in sec.
Td
Differential-element of the regulator in sec.
Ap
Approach. Area of the regulator-deviation (as factor of Xp) in which the Td of the regulator is effective.
Ymax

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Maximum value of control variable Y of the regulator in%.
Ymin
Minimal value of the control variable Y of the regulator in%.
Ymax and Ymins define the work-range of the control variable Ý. Ymax is normally set to +100%.
The setting of Ymin depends on the control loop and the actuator. The following table gives some hints.
Actuator
Structure
Ymin
continuous, proportion-
al-valve
only enriching gas, no air, 0%
continuous, proportion-
al-valve
enriching gas and air -100% *
Magnetic-valve only enriching gas, no air, 0%
Magnetic-valve enriching gas and air -100% *
Servomotor -100%
* To avoid undershooting with negative setpoint steps, Ymin may be set to values in the range of –10%..
-100%.
RelLimit1, RelLimit2,
Relative-limits in units of the control variable.
All limits are activated if the actual values of the controller exceeds the limit. The effective limit of a rela-
tive-limit results from the setpoint + relative-limit.
Example:
Control variable Cp, setpoint: 1,00%, RL1: 0,05%. The limit becomes active if the actual value of Cp
exceeds 1,05%.
(WA)
Rg1Relay, Rg2Relay,
effective direction of a relatively-limit. Rg1Relay active ON means that the Rg1Relay will be closed
when the limit becomes active. Active OFF means that the Rg1relay will be closed, when the limit be-
comes inactive.
AbsLimit1, AbsLimit2,
Absolute-limit in units of the control variable. The limit actively becomes and the corresponding relay
closes if the actual value of the regulator exceeds the absolute-limit (WA).
TSave
Security-temperature of the atmosphere-regulator.
The regulator is released, if TCS >= TSave or control variable is not Cp and the TCS-element is not
broken. A not released regulator behaves like a turned off regulator.
Refer to the security-hint at the beginning of this manual.
Control Variable
Selection the control variable of the Atm-controller. The standardization-value of the regulator is de-
pendent from the selection of the control variable:
control variable
Standardization
-
value
Cp 1.00%C
KC 5.0
O2absolut 1e-20

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O2% 100% O2S
O2ppm 100PPM O2S
LogO2
-
20.0
KN 1.0
TP 100°C
Actuator
Selection of the actuator for the regulator.
actuator
type o
f control
Continuous The regulator switches no actuator relay. The analog output is used for an
actuator
Magnetic-valve The actuator relay correspondents to the control values. The ON/OFF relation
correspond to the Y-value:
Y = 30% >> the UP-relay is switched on 30% of the cycle.
Y = -60% >> the DOWN-Relay is switched on 60% of the cycle.
Servomotor The actuator relay generates adjustment pulses for a servomotor, the regulator
takes the integral behavior of the actuator into account.
Cact
, changeover actua-
tor,
This setting is used if a proportionally-valve or a mass-flow-controller acts as
actuator. The actuator relays switch the release-valves for gas (UP-Relay) as
well as air (DOWN-Relay), the proportionally-valve or the mass-flow-controller
is controller from the analog output.
Controller ON/OFF
Operating state of the controller.
DigIn LocSP
Allocation of a digital input for the selection of the local setpoint.
DigIn RefAir
Allocation of a digital input for the supervision of the reference-air of the O2-probe (WA).
If a digital input is assigned to this function, so the Atm-controller will stop if this signal is missed.

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Relay-allocation
Relay
-
name
Function
UP-Relay actuator relay for Y> 0, with Cact release-relay for Y> 0
DOWN-Relay actuator relay for Y <0, with Cact release-relay for Y <0
Rg1Relay output-relay for relative-limit 1, active ON or OFF
Rg2Relay output-relay for relative-limit 2, active ON or OFF
AG1-Relay output-relay for absolute-limit 1, actively ON,
AG2-Relay output-relay for absolute-limit 2, actively ON,
IDENT
The IDENT-function facilitates an automatic optimization of the settings of the controller.
Requirements for the ATM controller:
1. The furnace is on working temperature.
2. The flow rates of the regulation- and base gassing are set. An alteration of these quantities after the
optimization usually makes a readjustment of the parameters necessary.
3. For best results, the furnace must contain a charge.
Procedure:
1. manage the requirements, see above.
2. turn the regulators off (the identification works only with a turned off regulator).
3.set a setpoint at the low end of the working - area.
4. start the identification and wait for the results. After the end of the process, the regulator calculates
the matching parameters, switches itself on and approaches the setpoint.
5. Through observation verify that control behavior is satisfactorily.
TMP-Controller
According to selection of the parameters, the algorithm can work as P -, PI -, PD - or PID-controller.
The controller considers the properties of the actuator.
A function for the automatic identification of the control loop is available, which determines the optimal
parameter set.
Two relative-limits are available, whose switching-points can be set to a fixed distance to the setpoint.
debit-value, stand. The effective direction (active on or active off) is selectable.
Two absolute-limits are available, whose switching-points can be set to a fixed value of the control vari-
able. The appropriate relays switch with exceeding of the switch-point (WA).
Akt.SP
Display of the effective setpoint (regardless from local/remote mode)
Active local SP
Selection of the local setpoint 1/2. In operating mode Remote, „Remote “ is displayed and the setpoint is
not selectable.
Loc SP1, Loc SP2,
Setting of the local setpoints, which are only effective in local mode.

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Cycle
Interval, after which the regulator calculates a new control value.
Xp
Proportional band of the regulator in % of the standardization –value 1200°C.
Ti
Integral element of the regulator in sec.
Td
Differential-element of the regulator in sec.
Ap
Approach. Area of the regulator-deviation (as factor of Xp) in which the Td of the regulator is effective.
Ymax
Maximum value of control variable Y of the regulator in%.
Ymin
Minimal value of the control variable Y of the regulator in%.
Ymax and Ymins define the work-range of the control variable Ý. Ymax is normally set to +100%.
The setting of Ymin depends on the control loop and the actuator. The following table gives some hints.
Actuator
Structure
Ymin
continuous, thyristor
controller
only heating, no cooling 0%
magnetic-valve heating and cooling -100% *
Servomotor gas heating -100%
* To avoid undershooting with negative setpoint steps, Ymin may be set to values in the range of –10%..
-100%.
RelLimit1, RelLimit2,
Relative-limit in °C.
All limits are activated if the actual values of the controller exceeds the limit. The effective limit of a rela-
tive-limit results from the setpoint + relative-limit.
Example:
Control variable TC2, setpoint: 900°C, RL1: +5°C. The limit becomes active if the actual value exceeds
905°C.
(WA)
Rg1Relay, Rg2Relay,
effective direction of a relatively-limit. Rg1Relay active ON means that the Rg1Relay will be closed
when the limit becomes active. Active OFF means that the Rg1relay will be closed, when the limit be-
comes inactive.
AbsLimit1, AbsLimit2,
Absolute-limit in units of the control variable. The limit actively becomes and the corresponding relay
closes if the actual value of the regulator exceeds the absolute-limit (WA).

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control variable
Actuator
Selection of the actuator for the regulator.
actuator
type of control
Continuous The regulator switches no actuator relay. The analog output is used for an
actuator
Magnetic-valve The actuator relay correspondents to the control values. The ON/OFF relation
correspond to the Y-value:
Y = 30% >> the UP-relay is switched on 30% of the cycle.
Y = -60% >> the DOWN-Relay is switched on 60% of the cycle.
Servomotor The actuator relay generates adjustment pulses for a servomotor, the regulator
takes the integral behavior of the actuator into account.
Controller ON/OFF
Operating state of the controller.
DigIn LocSP
Allocation of a digital input for the selection of the local setpoint.
Relay-allocation
Relay
-
name
Function
UP-Relay actuator relay for Y> 0
DOWN-Relay actuator relay for Y <0
Rg1Relay output-relay for relative-limit 1, active ON or OFF
Rg2Relay output-relay for relative-limit 2, active ON or OFF
AG1-Relay output-relay for absolute-limit 1, actively ON,
AG2-Relay output-relay for absolute-limit 2, actively ON,
IDENT
The IDENT-function facilitates an automatic optimization of the settings of the controller.
Requirements for the TMP controller:
1. The furnace temperature is minimum 200°C below the desired setpoint or is cold.
2. For best results, the furnace must contain a charge.
Procedure:
1. manage the requirements, see above.
2. turn the regulators off (the identification works only with a turned off regulator).
3.set a setpoint at the low end of the working - area.
4. start the identification and wait for the results. After the end of the process, the regulator calculates
the matching parameters, switches itself on and approaches the setpoint.
5. Through observation verify that control behavior is satisfactorily.
Measurement Input
PT50 possesses three analog measurement inputs for Sensor – e.m.f. U.S. and the temperature inputs
TC1 and TC2. TCS is used for the calculation. For TCS, As alternative TC1 or TC2 can be used. The
regulators heed the thermo-break-supervision of that for the regulation responsible thermocouple.
Each measurement input contains an adjustable digital filter for the absorption of fast fluctuations of the
measurement value. In this menu, the filter-time-constant can be set for each input in s. A “0” turns the
filter OFF.

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The inputs for TC1 and TC2 can become parameterized for the linearization and compensation of dif-
ferent thermo-couple-types.
U.S.
Display of the Sensor – e.m.f. in mV
UTH1
Display of the thermo voltage of the TC1 input in mV
TC1
Display of TC1 in °C
UTH2
Display of the thermo voltage of the TC2 input in mV
TC2
Display of TC2 in °C
TCS
Display of TCS in °C. This is the value which is used for the calculation of the actual value (e.g. Cp,
O2,..)
TCS = TC1/TC2
Selection of TCS.
TCUS
Filter-time-constant of the US-input in sec.
TCTCS
Filter-time-constant of the TCS-input in sec.
ThEL TC1
Selection of the thermocouple type for TC1.
available are: PtRh10s (S), PtRh13 (R) and, Pt13Rh6(B).
TCT2
Filter-time-constant of the TC2-Eingangs in sec.
THEL TC2
Selection of the thermocouple type for TC2.
available are: PtRh10 (S), PtRh13 (R), Pt13Rh6(B), NiCrNi (K), NiCrSi (N), FeCo (J),
Prozess Values
Parameter
Meaning
CO [%] CO value which is used for the calculation of the process values
AnaIn CO To take the CO-value of an analyzer a ext. analog input can be used. In this case the
scaling must be set in the next two columns. With AnaIn CO = ---- the CO has to be
set manually or by a process leading system.

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0% = CO CO-value at 0% analog input value
100% = CO CO-value at 100% analog-input value.
H2 [%]
H2 value which is used for the calculation of the process values
AnaIn H2 To take the H2-value of an analyzer a ext. analog input can be used. In this case the
scaling must be set in the next two columns. With AnaIn H2 = ---- the H2 has to be
set manually or by a process leading system
0% = H2
H2
-
value at 0% analog input value
100% = H2 H2-Wert at 100% analog input value.
Foil
In order to calculate automatically the accurate correction-factor for a foil-measurement, PT50 requires
two information:
1. The measured Cp at the time of the foil-measurement.
2. determination of the Cp-value of the foil
The first two lines in the submenu foil serve for the setting of this information.
Foil standby/ready !
When the foil is extracted during a foil-measurement out of the furnace, the PT 50 must be informed by
setting this line to “foil ready!”. The PT50 remembers the corresponding Cp-value in order to use it for
the calculation of the correction-factor.
Foil-value
The Cp-value from the analysis has to be entered here. The enter-function can only be called if PT50
was told before that a foil has been extracted. After end of the input, the PT50 calculates the new cor-
rection-factor.
KF
Shows the last entered or automatically calculated Cp-correction-factor. Hint: the correction-factor can
be set manually in the submenu „correction “.
Correction
If for an input an offset <> 0 is parameterized, then the mark OFFSET! appears in the overview-
windows beside the corresponding value. Through pointing to this mark the value of the offsets will be
shown.
US-Offset
corrective offset for the US-input in mV
TCS-Offset
corrective offset for the TCS-input in °C
TC2-Offset
corrective offset for the TC2-input in °C
Correction-factor

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Correction-factor for the Cp-calculation. The Cp-value = calculated Cp * correction-factor
O2%-Offset
Corrective offset for O2%.
O2ppm-Offset
Corrective offset for O2ppm.
LogO2-Offset
Corrective offset for LogO2.
Attention! The corrective offsets for the different representations of the O2 partial pressure are inde-
pendent from each other. If all three O2-oOffsets are not 0, is not guaranteed that the representation-
forms are consistent among each other!
K1, K2,
The calculation of the C-potential with application of a lambda probe (result Cpl) , uses beside the the
CO-value the coefficients K1 and K2. Default values are:
K1 907.0
K2 0.2145
By means of these coefficients, corrections can be made for the calculation of Cpl. It is recommended
however not to change K1 and K2. It is better to do corrections with USOFS and the correction-factor
(see above).

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CAN-Bus
Attention! Changes in this menu become effective not until the PT50 is switched off and on
PT50 is equipped with a CAN-Bus-Interface as standard. Two operating modes are available:
1. CANBUS Slave: The module corresponds to the CANopen-Standard (implements not yet completely)
2. CANBUS Standalone: The module works as masters for I/O modules according the CANopen-
Standard and sends when switching on " Node start” commands.
In operating mode „Standalone “ the connection between PT50 and the I/O-modules are watched by
nodeguarding ( WA)
Further information about the operation of the PT50 with CAN-Bus-Interface is available in a separate
document.
Baud rate
Baud rate of the CAN-connection
NodeID
CANopen-NodeID of the PT50
IO-MODUL ID
CANopen-NodeID of the I/O-modul in Standalone-mode. If 0, then the module is not spoken to.
CATSENSOR ID
CANopen-NodeID of an additional Catsensors with Standalone-operation. If 0, then the module will be
not addressed.
Autosend
Reserved for future enhancements. Must be set always to 0.
Operating mode
Selection of CANBUS Slave / Standalone

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The following two submenus are displayed alternatively, because only one of the optional interfaces can
be installed. Without installed interface the main menu shows „----- „.
MODBUS
Attention! Changes in this menu become effective not until the PT50 is switched off and on
PT50 can be equipped optionally with a RS485-Interface with MODBUS-driver. The interface can oper-
ate in 2-wire or in the 4-wire mode. The selection is done by software.
The MODBUS-driver supports only the RTU-Mode and requires a sign-length of 8 bits.
Further information to the operation of the PT50 with MODBUS-Interface is available in a separate doc-
ument.
Address
MODBUS-address of the module, allowed range: 1 … 247
Baud rate
Baud rate, values are possible between 300Bd and 38400Bd.
Sign-length
7 bits or 8 bits
Parity
possible settings: even, odd, mark, none
Stopbits
1 or 2 stop bits
Attention: With baud rates over 9600Bd some communication partners requires 2 stop bits in order to
be able to read the messages correctly.
Mode
2-wire-interface or 4-wire-interface

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PROFIBUS
PT50 can be equipped optionally with a PROFIBUS-DP-Interface. The necessary GSD-file for develop-
ment tools is available as PEH_002.gsd.
PT50 represents a modular Profibus-DP-Slave at the PROFIBUS. It can be configured either in i_CS
(carburizing) or in i_NS (nitrating) mode., Nitrocarburieren, can be driven. The data structure is depend-
ent on the selected configuration.
Properties:
 The Pfofibus-address is set manually at the PT50 or with help of the service-program.
 The baud rate is recognized automatically, the profibus standard values are in the range from
9600Bd … 12 Mbauds..
 Freeze - and Sync-operation are not supported because these are not meaningful for PT50.
 With the project planning by means of a GSD-file, the configurations „i_CS “and „i_NS “ are se-
lectable. PT50 gets ready automatically in the Configuration-phase for the chosen configuration.
 The SPS can always read the at the input values from the PT50. Output data (setpoints and pro-
cess parameters) will be adopted only in Remote mode.
 faults are transferred as external diagnostics.
Attention! Because Input and output data are transferred constantly with profibus, the master must al-
ways prepare all output data comprehended in the chosen configuration (setpoints and process pa-
rameters), even if is they are constant. The take over of the setpoints requires Remote operating mode.
Further information to the operation of the PT50 with MODBUS-Interface is available in a separate doc-
ument.
DP-Status
Shows the status of the PROFIBUS-DP connection:
Status
Explanation
Wait_PRM The PROFIBUS-DP-Interface waits for the information of the communication-
parameters from the busmaster..
Wait_CFG The PROFIBUS-DP-Interface waits for the selection and checkup of the data-
configuration through the Busmaster.
DATA_EX The connection was built up successfully, data are exchanged.
Baud rate
Baud rate of the PROFIBUS-DP – connection
Act.Config.
From the Busmaster ordered and from the PT50 of confirmed data-configuration.
Configuration
Application
i_CS carburizing furnaces with Cp-control or similar
i_NS Nitrating- and nitrocarburizing furnaces
Address
Address of the PT50 in the PROFIBUS network.