WELBA MRF-2 Series User manual
1. Introduction
104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020 Page 1
Programmable PID multichannel
temperature controller
MRF-2 ...
MRH-2 ...
Installation and operating instructions
for plant engineering companies
Software version V2.4
Programmable via
configuration software
WELBA „KONSOFT"
Measuring - Controlling - Regulating
All from the same source
1. Introduction
104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020 Page 3
Content
1. Introduction ................................................................................................................................................4
1.1 Information about this operating instructions .................................................................................4
1.2 Limitation of liability ........................................................................................................................5
1.3 Appliance description .....................................................................................................................6
1.4 Model / type plate...........................................................................................................................7
1.5 Items supplied ................................................................................................................................8
1.6 Disposal..........................................................................................................................................8
1.7 Cleaning instructions......................................................................................................................8
1.8 Dimensions.....................................................................................................................................9
1.9 Technical data ..............................................................................................................................10
2. Safety .......................................................................................................................................................11
2.1 General Information .....................................................................................................................11
2.2 Intended use.................................................................................................................................13
2.3 Wiring, screening, earthing ..........................................................................................................14
2.4 Electrical safety ............................................................................................................................14
3. Installation ................................................................................................................................................15
3.1 Location and climatic conditions ..................................................................................................15
3.2 Unpacking and storage ................................................................................................................15
3.3 Installation of housing ..................................................................................................................15
3.4 Fitting the sensor..........................................................................................................................16
4. Electrical connection ................................................................................................................................17
4.1 Safety during installation ..............................................................................................................17
4.2Procedure.....................................................................................................................................17
4.3 Wiring ...........................................................................................................................................18
4.4 Circuit diagram .............................................................................................................................18
5. Operation .................................................................................................................................................19
5.1 General Hints and Tips ................................................................................................................19
5.2 BG ETEMController overview ......................................................................................................20
5.3 Controls / Displays .......................................................................................................................21
5.3.1 Meaning of LED’s........................................................................................................................21
5.3.2 Button functions (Working level) .................................................................................................21
5.4 Controller architecture..................................................................................................................22
5.4.1 Explanation of controller and function blocks .............................................................................23
5.5 The quick way to set parameters .................................................................................................25
5.6 Parameter Quick-Guide ...............................................................................................................26
5.7 Parameter levels ..........................................................................................................................27
5.7.1 Operation of parameter levels.....................................................................................................28
5.7.2 Changing and storing parameters ..............................................................................................28
5.8 Parameter lists .............................................................................................................................29
5.8.1 C- parameters (Programming level) ...........................................................................................29
5.8.2 P- parameters (configuration level).............................................................................................31
5.8.3 H- parameter (option level) .........................................................................................................35
5.8.4 d- parameter (hardware configuration) .......................................................................................39
6. Other information .....................................................................................................................................42
6.1 Setting the actual value correction ...............................................................................................42
6.2 Fault indication .............................................................................................................................43
6.3 General measures when using electronic control systems..........................................................44
1. Introduction
Page 4104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020
1. Introduction
1.1 Information about this operating instructions
These operating instructions are intended for the use by plant engineers, installers
or service technicians of the MRF-2 | MRH-2 PID multichannel temperature control-
ler. This manual contains all necessary suggestions, informations, recommendations
and advice for the safe and proper installation and commissioning of the controller.
It is only with the knowledge of this operating instruction that errors in the controller
can be avoided and a trouble-free operation is guaranteed.
Read the assembly instructions carefully and adhere to the recommendations descri-
bed in order to ensure proper operation. In addition, the local accident prevention
regulations and general safety regulations are to be observed for the field of appli-
cation of the controller.
When delivered, the parameterization of the MRF-2 | MRH-2 does not
necessarily correspond to the intended use. This must be adjusted ac-
cordingly during the installation.
Basically, the installer of the system is responsible for the commissio-
ning of the control.
Operation instruction for the operator
The plant engineers, the installer or the service technician must prepare operating
instructions for the operator of the controller. In this case the parameterization of the
delivery state must be clearly documented.
We recommend to only document those parameters which the operator of the con-
troller needs.
When preparing the operating instructions for the operator the local regulations have
to be observed –see chapter “Safety”.
These operating instructions include important technical and safety in-
formation. It is vital to carefully study all these instructions before the
installation of the control or in case of any other work with the control!
These instructions have been prepared with the utmost care. However, the informa-
tion contained herein is not an assurance of product characteristics.
The manufacturer accepts no liability for errors and reserves the right to make tech-
nical changes at any time. All rights reserved.
NOTICE for storing the operating instructions
This instruction manual is part of the product and must always be readily available
for the service technician.
WARNING
NOTICE
1. Introduction
104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020 Page 5
1.2 Limitation of liability
The proper function of the WTS-300 depends on many external factors
on which the manufacturer has no influence. The manufacturer
assumes no liability for damage to connected components or
downstream process components.
All information and instructions in this manual have been compiled taking into ac-
count the applicable standards and regulations, the state of the art and our long-term
experiences.
WELBA GmbH does not assume any liability for damages due to:
- Non-observance of the installation instruction
- Improper use
- Installation by unqualified staff
- Non-professional installation by third parties
- Unauthorized modifications
- Technical modifications
Otherwise, our general terms and conditions as well as the terms of delivery of
WELBA GmbH and the legal regulations valid at the time of conclusion of the
contract are applicable.
We reserve the right to make technical changes in the context of improving the pro-
perties of use and further developments,
WARNING
1. Introduction
Page 6104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020
1.3 Appliance description
Controllers in the MRF-2 | MRH-2 series are universal four-channel PID temperature
controllers used to regulate and control industrial heating and cooling applications.
The four built-in controller components offer complex setting options for optimum
performance of the widest possible range of different control tasks. This means that
two-point and three-point control operations, continuous and pulsed PID control ope-
rations, multi-zonal control, absolute and difference temperature control, and other
complex control tasks up to and including compressor rotation in composite systems
are all possible.
The four autonomous control channels can be combined with external items such
as digital inputs, fault indicators, temperature alarms or button functions. The con-
troller architecture circuit diagram illustrates the full range of combination options
offered by the modular hardware concept.
The MRF-2 | MRH-2 has up to three analogue universal temperature sensor inputs,
one configurable analogue input and up to five digital inputs. Temperature sensor
types KTY, PT-100 (2 or 3 leads) or PT1000 can be connected to it. The analogue
input can be configured to 0 .. 10 V or 4 .. 20 mA.
External plant components such as heating systems, condensing units, control val-
ves, mixing valves, pumps, fans, signal transmitters etc. can be controlled through
up to five relay outputs or a freely configurable analogue output.
The operation and prior setting of the parameters of the MRF-2 | MRH-2 is divided
into four operating levels. Access rights for each level must be determined by the
plant engineering company. The programming level includes, for example, the para-
meters which the end user must be able to adjust during subsequent operation. As
interference with the basic configuration by the end user can result in dangerous
changes to functions, access to the other parameter levels is made more difficult by
the use of codes.
A type RS-485 interface is provided for communication with higher-level systems.
WELBA “KONSOFT”
The configuration software available as an option offers a simple way to set parame-
ters and update the temperature controller. The values measured by the three sen-
sors, the analogue input and the analogue output control signal can be transmitted
to a PC.
These instructions have been compiled with maximum care and attention. However,
their content does not constitute an assurance of product features.
The manufacture cannot be held liable for errors and may at any time make changes
serving technical progress. All rights reserved.
1. Introduction
104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020 Page 7
1.4 Model / type plate
These instructions apply to all controllers in the series MRF-2 | MRH-2. They contain
detailed descriptions for operation and parameter setting for all variants.
The type designation and the exact connection diagram for your controller can be
found on the controller as a connection sticker.
Example:
Controller type designation:
and
You can find a more detailed connection diagram for your controller on the accom-
panying device documentation.
Example:
LN
34 42
K1..K4: 230V AC 5A AC1
K1
13 14 23 24
K2 K3
31 41 44
K4
32A1 A2
104444
230V (50/60Hz)AC
MRF-2-001-A
76 5
i1 4 3 2 1
i2i3i4 8
Sonsor:
PT100-2/3L
KTY 81-210
-
+
RX/TX
RX/TXKTY 81-110
PT1000
A1 ANALOG
IN
DIGITAL IN-RS 485Sensor 1Sensor 2
GNDU/I
L N
34 42
K1..K4: 230V 5A 1AC AC
K1
13 14 23 24
K2 K3
31 41 44
K4
32A1 A2
104444
230V (50/60Hz)AC
MRF-2-001-A
1. Introduction
Page 8104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020
1.5 Items supplied
- Controller MRF-2 | MRH-2
- Holder
- Rubber seal
- Fixing screws
- Accompanying documentation
- Software “WELBA-KONSOFT” (optional)
1.6 Disposal
For the purposes of disposal, the device is classified as waste electronic equipment
within the meaning of European Directive 2002/96/EC (WEEE) and must not be in-
cluded with household waste. It must be disposed of through the correct channels.
Local and current legislation must be observed.
1.7 Cleaning instructions
The enclosure front (front foil) can be cleaned with usual detergents.
ATTENTION: The enclosure front is not resistant to aggressive acids
and alkalis, abrasive cleaners and cleaning with high-pressure
cleaners!
The use of these cleaners and cleaning methods may lead to damages!
NOTICE
1. Introduction
104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020 Page 9
1.8 Dimensions
MRF-2
1
2
3
4
°C
MRH-2
R5
1
2
3
4
°C
Panel cutout
87,5 x 66,5 mm
Pin size welding studs M3
96 x 53 mm
Panel cutout
87 x 56 mm
1. Introduction
Page 10 104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020
1.9 Technical data
Operating voltage
see circuit diagram sticker
Relay contact
depending on device - see circuit diagram sticker
max. switching current
depending on device - see circuit diagram sticker
max. switching voltage
depending on device - see circuit diagram sticker
Display
13 mm LED-Display, 3 digits
Display range
-99 .. 999
Number of inputs
2 or 3
Usable sensors
KTY 81-110
KTY 81-210
PT 100 (2- oder 3-Leiter)
PT 1000
Measurement range
- KTY 81-110
- KTY 81-210
- PT 100 - 2 Leiter
- PT 100 - 3 Leiter
- PT 1000
-50° .. +150°C
-50° .. +150°C
-99° .. +400°C
-99° .. +400°C
-99° .. +400°C
Digital inputs
up to 5 (via opto coupler)
Temperature alarms
2 (independently)
Control mode
two-step / three-step control
PID (continuous or pulsed)
Hysteresis
0,1 K .. 99,9 K freely adjustable
Housing MRF-2
(Front panel mount.)
Housing MRH-2
(Rear wall mount.)
- Front size 106 x 68 mm
- Front panel cut 87 x 56 mm
- Overall dimension 108 x 80 mm
- Front panel cut 87,2 x 66,2 mm
Installation conditions
Regulator is designed as ,built-in appliance‘
Degree of protection
- Housing front
- Rear
IP 64
IP 00
Electrical safety
Overvoltage category III, pollution degree I
Connection
Plug-in screw connections
for cables up to 2,5 mm²
Environment specifications:
- Operation temperature
- Storage temperature
- max. humidity
0° .. +50°C
-20° .. +70°C
75% (no dew)
Pollution degree
Electrically conductive pollution must not enter the
housing interior
Overvoltage category
CAT II
Technical data subject to change
2. Safety
104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020 Page 11
2. Safety
2.1 General Information
The plant engineering company must prepare operating instructions
for the operator, taking account of the controller's parameters as
supplied.
We recommend referring only to the parameters which the end user
needs for safe operation.
In preparing the operating instructions for the end user, especially the
chapter on “Safety”, account must be taken of local regulations.
IMPORTANT
The parameter settings of the MRF-2 | MRH-2 as supplied do not cor-
respond to the intended use (e.g. compressor output is pulsed).
This can lead to undefined behaviour by individual components when
the system is commissioned.
For this reason, no actuators should be connected when starting ope-
ration. Load circuits should be separated.
The general principle is that the plant constructor is responsible for
putting the controller into operation.
WARNING
NOTICE
2. Safety
Page 12 104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020
These operating instructions contain important technical and safety in-
formation. Please read carefully before installation and before any work
on or with the regulator.
It is the duty of the party commissioning the system to ensure compli-
ance with the following guidelines.
The PID multichannel temperature controller may only be installed by
an authorised specialist, observing all local safety requirements.
Access to the environment when connected must be restricted to spe-
cialised personnel.
PID multichannel temperature controllers contain live components.
They must be built into the plant in such a way that contact with such
live components is impossible.
Precise technical data can be found in the accompanying documenta-
tionor on the stickers affixed to the controller.
The controller is not suitable for use in explosive atmospheres. Danger
of explosion. Use only outside areas subject to explosive atmospheres.
The device must not be used if the housing or connection terminals are
damaged.
No fluids must penetrate the housing.
WARNING
2. Safety
104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020 Page 13
2.2 Intended use
Programmable PID multichannel temperature controllers are intended for use in in-
dustrial systems. They are designed to control heating systems, condensing units,
alarms, fans, etc. Any other use of the device is permitted only with prior written
permission from the manufacturer.
They must not be used by private individuals, for example to control domestic hea-
ting or air-conditioning systems.
The temperature controller is intended only for incorporating into machinery, display
panels or switchboxes etc. and when fitted correspond to protection class 2 (double
or reinforced insulation). It may only be put into operation when installed. The use of
the controller is permitted in devices of protection class 1 and 2. The entire product
must not be changed or converted!
The temperature controller is ready for use only when the parameters have been set
appropriately. Its use before this has been done would have no benefits and could
also damage the equipment or adversely affect the medium to be temperature-con-
trolled.
The responsibility for the correct functioning of connected equipment lies with the
plant engineering company.
The controller is not suitable for use in explosive atmospheres. Danger of explosion.
Use only outside areas subject to explosive atmospheres.
The PID multichannel temperature controller fulfils the EC requirements for
electromagnetic compatibility (EMC) and the Low Voltage Directive (LVD).
The safety components meet the VDE regulations.
2. Safety
Page 14 104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020
2.3 Wiring, screening, earthing
When selecting wiring materials and installing and connecting the temperature con-
troller to the electricity supply, account must be taken of DIN VDE 0100 “Erection of
power installations with rated voltages below 1000” or the relevant national regulati-
ons (e.g. based on IEC 60364).
Wherever possible, keep input, output and supply leads and sensor cable
physically separate from each other and do not lay them parallel to each
other.
Use screened and twisted interface and sensor cables.
Earth the screening of temperature sensors unilaterally in the switchbox.
Ensure correctly wired potential equalisation.
2.4 Electrical safety
All control and load circuits must be fused in accordance with local regulati-
ons.
In order to prevent destruction of the relay or semiconductor relay outputs in
the event of a short-circuit, the load circuit should be fused to the maximum
permissible output current.
As well as incorrect installation, wrong parameter settings can also adversely
affect the correct functioning of the controller. For this reason, safety devices
that are independent of the controller should always be used, e.g. high and
low pressure valves or temperature limiters. Account should be taken of the
local safety regulations in this connection.
3. Installation
104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020 Page 15
3. Installation
3.1 Location and climatic conditions
It is essential not to install the device under the following conditions:
- severe jolting, vibration or magnetic fields
- permanent contact with water
- relative humidity of more than 90%
- sharply fluctuating temperatures (condensation)
- dust, flammable gases, vapors, solvents,
- operation in an aggressive atmosphere (ammonia or sulphur fumes) - risk of
oxidation
- operation in the immediate vicinity of radio transmitters with high levels of spu-
rious radiation.
A physical separation between the device and inductive consumers is recom-
mended.
3.2 Unpacking and storage
If the packaging is damaged or something is missing, do not fit the temperature con-
troller. In this case please contact Welba.
If you keep the temperature controller for a period before using it, store it in a clean
dry place at a temperature of between -20°C and +70°C.
3.3 Installation of housing
MRF-2
For fixing the housing please follow the instructions:
Place the seal carefully in the groove. Ensure it is not twisted.
Insert the housing from the front through the switchboard cut-out.
Attach the holding frame in the rear position as shown by the picture.
Fasten the housing by using the screws provided.
Panel cutout
87 x 56 mm
3. Installation
Page 16 104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020
MRH-2
For fixing the housing please follow the instructions:
Place the seal carefully in the groove. Ensure it is not twisted.
Push the housing onto the stud bolts from behind.
Fasten the housing by using the hex nuts provided..
3.4 Fitting the sensor
The sensor cable must not be chafed or kinked.
Do not place the sensor and the high-voltage cable in the same cable
conduit (not even within the switchbox).
The MRF-2 | MRH-2 has been designed for connection to various types of sensor
(see technical data). It can function properly only if one of those sensor types is
installed and the parameters are correctly set.
When setting the temperature controller parameters (and whenever the sensor is
replaced) the “actual value correction” [Parameter C91] must be adjusted so that the
temperature measured corresponds to that shown on the display. A reference ther-
mometer should be used for this purpose.
See the section Fehler! Verweisquelle konnte nicht gefunden werden. "Setting
the actual value correction".
Pay attention to the permitted temperature range for sensor cable exposure.
1
2
3
4
°C
R5
Panel cutout
87,5 x 66,5 mm
Pin size welding studs M3
96 x 53 mm
WARNING
4. Electrical connection
104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020 Page 17
4. Electrical connection
4.1 Safety during installation
Before connecting ensure that the mains voltage is the same as
indicated on the device's type plate.
Incorrect electrical connection can cause damage to the regulator and
to the equipment.
The temperature controller should be disconnected from the mains vol-
tage while connecting plant components or the sensor.
No appliances with current levels in excess of the maximum values in-
dicated at the technical data should be connected to the relay contacts
Use contactors.
Downstream contactors must be fitted with an RC protection circuit.
(see also section Fehler! Verweisquelle konnte nicht gefunden werden.)
No other consumers may be connected to the controller's mains termi-
nals.
4.2 Procedure
In order to avoid injury to persons or damage to connected
components, connections must in all cases be undertaken in the
following order!
This is to prevent an unsuitable pre-configuration damaging components when the
mains voltage is connected - e.g. compressor output is pulsed.
Pull out all the controller's plug-in terminals.
Put the controller in position in the housing or switchboard. (Section 3.3)
Connect all components and sensors in accordance with Section 4.4 (Circuit
diagram) to the plug-in terminals. (Do not yet plug the terminals into the con-
troller!)
Connect the mains cable to plug-in terminal A1 / A2.
Plug terminal A1/ A2 into the controller.
Close the switchbox and turn on the mains voltage.
Switch on the temperature controller and set the parameters (possibly using
the optional WELBA-KONSOFT configuration software).
Disconnect the system from the mains and open the switchbox.
Plug the pre-cabled plug-in terminals of the components into the controller.
Close the switchbox.
WARNING
WARNING
4. Electrical connection
Page 18 104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020
4.3 Wiring
Correct wiring in accordance with the information in the accompanying description
and local regulations is essential. Take particular care to ensure that the AC supply
is not connected to the sensor input or other low-voltage inputs or outputs.
The various relay contacts may only be connected with uniform tension.
Use copper wire (except for the sensor connection) and ensure that all supply leads
and connection terminals are dimensioned to suit the relevant current rating.
When connecting the controller and selecting the wiring materialsto be used, it is
essential to comply with the provisions of DIN VDE 0100 “Erection of power instal-
lations with rated voltages below 1000” or the relevant national regulations.
Furthermore, all connections must comply with the relevant VDE regulations or cor-
responding national regulations.
4.4 Circuit diagram
The correct circuit diagram for your controller is affixed to the housing and is also
included in the Accompanying Device Documentation.
All components (heating and cooling units, fans, alarms etc.) must be connec-
ted in accordance with the circuit diagram in the Accompanying Device Docu-
mentation of the controller.
NB:
The electrical connection must comply with the technical data in the Accom-
panying Device Documentation of the controller.
Use cable bushes.
Make sure that cables cannot chafe.
5. Operation
104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020 Page 19
5. Operation
5.1 General Hints and Tips
IMPORTANT:
Before starting operation, all the controller's parameters should be adjusted to suit
the system requirements.
Wrongly set parameters can lead to serious operational disruptions !
There follows a description of all the stages necessary for programming the various
controller configurations. Depending on the configuration, some parameters are hid-
den.
IMPORTANT:
When designing a control system, you should consider the consequences of a mal-
function. For example, in the case of a temperature control system there is the pos-
sibility of a heating unit not cutting out, leading to the possibility of injuries to persons
or damage to equipment. Protect yourself and your equipment by additional protec-
tive measures.
TIP:
We recommend you to note the values set on the controller before delivery to the
end user. In this way it is possible for you to deliver a pre-programmed controller in
the event of a spare part delivery.
When changing the controller at the end user's establishment, you will then only
need to re-set the actual value correction.
TIP:
In the standard setting, only the setpoint temperature C1 can be directly changed in
the operating level. When programming the different set temperatures, it is therefore
necessary to consider which setpoint temperature must be corrected most frequently
by the end user.
In the extended working level setting, the plant engineer can release further para-
meters of the setting level for the end user to view or modify.
TIP:
WELBA „KONSOFT"
The configuration software available as an option can be used to set and update the
temperature controller's parameters. The values measured by the three sensors, the
analogue input and the analogue output control signal can also be transmitted to a
PC.
5. Operation
Page 20 104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020
5.2 Controller overview
F2
K3 K4K1 K2
F1
L N
RS485
Relay outputs
For directly controlling control contactors
(pumps, compressors, heaters, etc.)
'Compressor rotation' or 'hot gas bypass' pro-
grammable.
High-pressure monitor: Functional safety en-
sured even in the event of a microprocessor
fault (meeting legal requirements.)
Timer module:
Various delays can be confi-
gured using the built-in ti-
mers.
For example:
Delayed switch-on after
mains power on,
Mutual delays between re-
lays
Compressor protection
Digital inputs:
Monitoring of external sys-
tem components.
Error message via LED and
relay output.
Internal logic operation with
timer module.
Analogue input:
either as a current input (4-
20 mA) or a voltage input (0-
10 V) can be parameterized.
Analogue output:
either as a current output (4-20
mA) or voltage output (0-10 V)
can be parameterized.
Universal
sensor inputs:
Operation with up to three
sensors.
Inputs configurable for
PTC, PT-100 2- or 3-wire
or PT 1000
RS485 interface:
for connection to the PC
Controller example
Digital
inputs
Power supply:
Variant A: 230 V ~
Variant F: 24 V -/=
This manual suits for next models
1
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