HBM RM4220 User manual

A1091-4.0 en/de
S.G.‐Amplifier
DMS‐Verstärker
RM4220
Operating Manual
Bedienungsanleitung

English Seite 3 - 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deutsch Page 21 - 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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RM4220
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Contents Page
English
Safety instructions 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Markings used 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Application 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Mounting/Dismounting 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Electrical connection 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Configuration and balancing (adjustment) 12. . . . . . . . . . . . . . . . . . . . .
5.1 Open the housing 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 Setting the DIP switches 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3 Setting up the zero point 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4 Set amplification 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5 Setting the filter 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Dimensions 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Applications 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1 Example 1: Load cell with tensile/compressive loading 16. . . . . . . .
7.2 Example 2: Load cell with compressive loading 17. . . . . . . . . . . . . .
8 Specifications 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 Repair 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Safety instructions
Intended use
The RM4220 amplifier is to be used exclusively for measurement tasks and dir
ectly related control tasks within the application limits detailed in the specifica
tions. Use for any purpose other than the above is deemed to be non‐desig
nated use.
The RM4220 amplifier is designed for installation in EMC‐proof housings (e.g.
control cabinet).
In the interests of safety, the device should only be operated by qualified per
sonnel as described in the Operating Manual and taking into account the spe
cifications. It is also essential to comply with the legal and safety requirements
for the application concerned during use. The same applies to the use of
accessories.
The scope of supply and performance of the RM4220 covers only a small area
of measurement technology. In addition, equipment planners, installers and
operators should plan, implement and respond to the safety engineering con
siderations of measurement technology in such a way as to minimize remain
ing dangers. On‐site regulations must be complied with at all times. There must
be reference to the remaining dangers connected with measurement techno
logy.
Each time, before commissioning, you must first run a project planning and risk
analysis that takes into account all the safety aspects of automation techno
logy. This particularly concerns personal and machine protection. Additional
safety precautions must be taken in plants where malfunctions could cause
major damage, loss of data or even personal injury. In the event of a fault,
these precautions must establish safe operating conditions. This can be done,
for example, by mechanical interlocking, error signaling, etc.
Ambient conditions on site
•Protect the device from direct contact with water (IP20).
•Please observe the permissible maximum ambient temperatures stated in
the specifications.
Conversions and modifications
The RM4220 amplifier must not be modified from the design or safety engin
eering point of view except with our express agreement. Any modification shall
exclude all liability on our part for any damage resulting therefrom.
In particular, any repair or soldering work on motherboards (replacement of
components) is prohibited. When exchanging complete modules, use only ori
ginal parts from HBM.

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Qualified personnel
Qualified persons means persons entrusted with the installation, fitting, com
missioning and operation of the product who possess the appropriate qualifica
tions for their function.
This includes people who meet at least one of the three following require
ments:
- Knowledge of the safety concepts of automation technology is a require
ment and as project personnel, you must be familiar with these concepts.
- As automation plant operating personnel, you have been instructed how to
handle the machinery. You are familiar with the operation of the modules
and technologies described in this documentation.
- As commissioning engineers or service engineers, you have successfully
completed the training to qualify you to repair the automation systems. You
are also authorized to activate, ground and label circuits and equipment in
accordance with safety engineering standards.
It is also essential to comply with the legal and safety requirements for the
application concerned during use. The same applies to the use of accessories.
General dangers of failing to follow the safety instructions
The RM4220 amplifier corresponds to the state of the art and is failsafe. The
device may give rise to residual dangers if it is inappropriately installed and
operated by untrained personnel. Any person instructed to carry out installa
tion, commissioning, maintenance or repair of the device must have read and
understood the Operating Manual and in particular the technical safety instruc
tions.
Maintenance and cleaning
The RM4220 amplifier is maintenance‐free. Please note the following points
when cleaning the housing:
•Before cleaning, disconnect the device from the power supply.
•Clean the housing with a soft, slightly damp (not wet!) cloth. You should
never use solvents, since these could damage the housing.
•When cleaning, ensure that no liquid gets into the device or connections.
Environmental protection, disposal
In accordance with national and local environmental protection and material
recovery and recycling regulations, old equipment that can no longer be used
must be disposed of separately and not with normal household garbage.
If you need more information about waste disposal, please contact your local
authorities or the dealer from whom you purchased the product.

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1 Markings used
Symbols on the device and their meaning
Symbol:
Meaning: Note supply voltage
This symbol indicates that the supply voltage must lie between 16 and 32 V.
Symbol:
Meaning: CE mark
The CE mark enables the manufacturer to guarantee that the product complies
with the requirements of the relevant EC directives (the Declaration of Con
formity can be found on the HBM website at www.hbm.com under Support ->
HBMdoc).
Symbol:
Meaning: Statutory waste disposal mark
In accordance with national and local environmental protection and material
recovery and recycling regulations, old devices that can no longer be used
must be disposed of separately and not with normal household garbage.
If you need more information about waste disposal, please contact your local
authorities or the dealer from whom you purchased the product.
Symbol:
20
Meaning: Statutory mark of compliance with emission limits in elec
tronic equipment supplied to China

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A1091-4.0 en/de HBM
The markings used in this document
The marking below draws your attention to important information about the
product or about handling the product.
Important
Important information

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2 Application
The RM4220 module is an amplifier for sensors with strain gages. The ampli
fier offers a very simple and practical setting of the zero point and the full scale
with DIP switches and potentiometers. The bridge excitation voltage can be
selected: 5 or 10V. The output signal can be 0 …10 V or 10 V and, at the
same time 4 …20 mA.
The transducer connection can be with four‐wire or six‐wire configuration. If
you are using six‐wire configuration, you can ignore the influence of the resist
ors or the resistance change of the extension cable.
The housing, made of polyamide PA type PHOENIX EM, can be attached to
any support rails as per DIN EN 60715. The support rails must be located
within an EMC‐proof housing, e.g. in a control cabinet.
Voltage supply
24 V 15 V
Excitation voltage 5/10V
Amplifier + Filter Output‐
interface
Amplification
Zero
Voltage
supply 24V
Output
0 …10V or
10V
Output
4 …20mA
GND
GND
GND
Fig. 2.1: Principle diagram

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A1091-4.0 en/de HBM
3 Mounting/Dismounting
The housing is mounted on a support rail as per DIN EN 60715. Hook the
housing in on the upper edge and press it downwards until the spring plate
engages on the bottom edge.
Hook in
Engage
Fig. 3.1: Mounting on a support rail
To remove, press the spring plate down with a screwdriver and unhook the
housing.
Fig. 3.2: Removal
Important
The support rail must be connected to grounded conductor potential . This
means that the RM4220 ground connection ( ) is also connected to the groun
ded conductor potential. The surrounding housing must also be grounded, i.e.
connected to the grounded conductor potential.

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4 Electrical connection
The connections are implemented via the four plug‐in terminals. The permiss
ible diameter of the connections is 0.13 mm2... 1.5 mm2. End sleeves (without
plastic collars, length 10 mm) should be used on the strands to connect the
wires to the terminals. Strands must not be tinned, irrespective of whether end
sleeves are used or not.
Fig. 4.1: Plug‐in terminals
The transducer cable and the signal output cables must be shielded. The cable
shield must be connected to or to the shielding of the surrounding housing.
The shielding must be connected extensively. With other connection tech
niques, an EMC‐proof shield should be applied in the wire area and this shield
should also be connected extensively (see also HBM Greenline Information,
brochure i1577). The surrounding housing must be EMC‐proof. All cables that
lead into this housing must be shielded and/or equipped with filters.
The four plug‐in terminals are labeled with numbers to prevent confusion when
attaching them to the four sockets. The connection diagram is printed on the
housing lid as shown in the tables below.
Six‐wire configuration must be used for connecting the transducer. The factory
setting is with four‐wire configuration, see Section 5.2, Page 13.
Connection with four‐wire configuration (factory setting)
Terminal Function Color of transducer connection
(HBM cable with four‐wire configuration)
1Signal -: Measurement signal (-) RD (red)
2Cable shield / Drain wire
3 -

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Connection with four‐wire configuration (factory setting)
4Exc +: Excitation voltage (+) for trans
ducer BU (blue)
5Signal +: Measurement signal (+) WH (white)
6M; no function, but do not use terminal
7 -
8Exc -: Excitation voltage (-) for trans
ducer BK (black)
Terminal Function External connections
9V + Supply voltage + (+16V …+32V)
10 Cable shield, preferable for voltage output
cable or for supply voltage cable shield
11 Vout Voltage output
12 GND GND, preferable for voltage output
13 GND Supply voltage -
14 Cable shield, preferable for current output
cable or for supply voltage cable shield
15 Iout Current output
16 GND GND, preferable for current output
Connection with six‐wire configuration (see Section 5.2, Page 13)
Terminal Function Color of transducer connection
(HBM cable with six‐wire configuration)
1Signal -: Measurement signal (‐) RD (red)
2Cable shield / Drain wire
3Sense +: Sense lead (+) GN (green)
4Exc +: Excitation voltage (+) for trans
ducer BU (blue)
5Signal +: Measurement signal (+) WH (white)
6M; no function, but do not use
terminal
7Sense -: Sense lead (-) GY (gray)
8Exc -: Excitation voltage (-) for trans
ducer BK (black)
Terminal Function External connections
9V + Supply voltage + (+16V …+32V)
10 Cable shield, preferable for voltage output
cable or for supply voltage cable shield
11 Vout Voltage output
12 GND GND, preferable for voltage output
13 GND Supply voltage -
14 Cable shield, preferable for current output
cable or for supply voltage cable shield
15 Iout Current output
16 GND GND, preferable for current output

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5 Configuration and balancing (adjustment)
Requirements for setup:
•The housing is open
•The transducer is connected
•The supply voltage is connected and switched on
Important
Switch the device on 15 minutes before adjustment to obtain a precise adjust
ment.
5.1 Open the housing
To open the housing, lift the top and bottom retainer tabs slightly so that they
slide over the engaging cams. Then pull the front part of the housing off
towards the front.
Retainer tab
Retainer tab
Fig. 5.1: Opening the housing

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Output voltage (0 …10V)
Excitation voltage (10V)
Four‐wire or six‐wire
configuration (four‐wire)
GAINZERO
Resistors for filter (SMD)
Resistors for filter
(conventional technology)
Fig. 5.2: Motherboard and position of DIP switch with opened housing, factory set
ting is shown in the image and in brackets
5.2 Setting the DIP switches
•OUTPUT sets the voltage output:
10V and 4 …20mA
0 …10V and 4 …20mA (switch position as in image, factory setting)
•EXCITATION sets the excitation voltage for the transducer:
5VDC
10VDC (switch position as in image, factory setting)
•6 WIRES and 4 WIRES change the switching type (both switches must
have the same position):
Six‐wire configuration
Four‐wire configuration (switch position as in image, factory setting)
5.3 Setting up the zero point
The zero point is set with ZERO (Fig. 5.2) and the Zero potentiometer (Front).

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Null(mVV) RBridge 1000
4RWRBridge
The table shows the adjustable misalignments for RBridge=350Ω and
RBridge=87Ω.
ZERO RZERO Zero for RBridge = 350 WZero for RBridge = 87 W
ΩmV/V mV/V
1 3.9⋅1060.020 (factory setting) 0.005 (factory setting)
2 2.2⋅1060.035 0.009
3 750⋅1030.110 0.028
4 301⋅1030.280 0.070
5 121⋅1030.710 0.175
6 49900 1.730 0.430
7 21000 4.000 1.000
8 9090 9.200 2.300
Set the coarse value with the ZERO DIP switches, the fine adjustment can be
implemented with the Zero potentiometer on the front.
5.4 Set amplification
The amplification is set with GAIN (Fig. 5.2) and the Gain potentiometer
(Front). To achieve the highest possible measured value resolution, you should
use the maximum output voltage of the amplifier (10V).
Partialload
Nominalload Meas.rangeinV
10VSensitivityinmVVNom.meas.range(Range)inmV
V
The table shows the measuring ranges that can be adjusted with GAIN
dependent on the bridge excitation voltage VE.
GAIN VE= 5V VE= 10V
mV/V mV/V
111.76 - 25 (factory setting) 5.88 - 12.5 (factory setting)
26.06 - 12.9 3.03 - 6.45
32.94 - 6.25 1.47 - 3.125
41.54 - 3.28 0.77 - 1.64
50.84 - 1.74 0.42 - 0.87
60.46 - 0.96 0.23 - 0.48
70.234 - 0.5 0.117 - 0.25
8Not used Not used

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5.5 Setting the filter
The filter bandwidth can be modified with the resistors R28, 29 and 30 (SMD
design) or R25, 26 and 27 (conventional configuration).
R28, 29, 30 or R25, 26, 27 Bandwidth
kΩHz
-3 (factory setting)
72.00 10
10.60 50
5.16 100
1.00 500
0.50 1000
0.10 5000
6 Dimensions
114
99
Dimensions (in mm; 1 mm = 0.03937 inches)

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7 Applications
7.1 Example 1: Load cell with tensile/compressive
loading
Load cell
•Resistance: 350 Ω
•Full bridge: Six‐wire configuration
•Sensitivity 3mV/V
Configuration (‐3 mV/V for ‐10 V (4 mA) and 3 mV/V for 10 V (20 mA))
•Set OUTPUT switch to +/- 10V.
•Set 4 WIRE/6 WIRE switch to six‐wire configuration.
•Set EXCITATION switch to supply voltage 10V (factory setting).
•Set GAIN switch to position 3:
G10
Sensitivity Supplyvoltage
•Set ZERO switch to position 2 (zero = 0.035mV/V).
•3 Hz bandwidth (factory setting).
Adjustment
•Relieve the transducer.
•Adjust with Zero on the front to 0V (12mA) with a voltmeter (amperemeter),
if the zero point is unstable, then change the zero point setting ZERO to
position 3 and adjust Zero again.
•Load the transducer with the required full scale.
•Adjust the Gain on the front to 10V (20mA) with a voltmeter
(amperemeter).
•Check the zero point adjustment again.
•The measurement chain is now adjusted and ready for operation.
Alternative setting
For 0 …10V (4 …20mA) output:
•Set OUTPUT switch to position 0/10V (factory setting).
•Set 4 WIRE/6 WIRE switch to six‐wire configuration.
•Set EXCITATION switch to supply voltage 10V (factory setting).
•Set GAIN switch to position 2:

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A1091-4.0 en/de HBM
G5
Sensitivity Supplyvoltage
•Set ZERO switch to position 7 (zero = 4.0mV/V).
•Load the transducer with the required full scale and set the voltage full scale
Vm(current end scale Im).
•Check that Vout = 5V (Iout = 12mA) for the zero point, if this is not the case,
adjust the Gain (front) so that Vout = 5V (Iout = 12mA).
•Relieve the transducer, adjust Zero (front) to 5V (12mA).
•Check the amplification adjustment again.
•The measuring chain is now adjusted and ready for operation.
7.2 Example 2: Load cell with compressive loading
Load cell
•Resistance: 350 Ω
•Full bridge: Six‐wire configuration
•Sensitivity 3mV/V
Configuration (0mV/V for 0V (4mA) and 3mV/V for 10V (20mA))
•Set OUTPUT switch to position 0/10V (factory setting).
•Set 4 WIRE/6 WIRE switch to six‐wire configuration.
•Set EXCITATION switch to supply voltage 10V (factory setting).
•Set GAIN switch to position 3:
G10
Sensitivity Supplyvoltage
•Set ZERO switch to position 2 (zero = 0.035mV/V).
•3 Hz bandwidth (factory setting).
Adjustment
•Adjust with Zero on the front to 0V (4mA) with a voltmeter (amperemeter),
if the zero point is unstable, then change the zero point setting ZERO to
position 3 and adjust Zero again.
•Load the transducer with the required full scale.
•Adjust the Gain on the front to 10V (20mA) with a voltmeter
(amperemeter).

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A1091-4.0 en/deHBM
•Check the zero point adjustment again.
•The measuring chain is now adjusted and ready for operation.
Alternative setting
For 10V (4 …20mA) output:
•Set OUTPUT switch to position +/-10V.
•Set 4 WIRE/6 WIRE switch to six‐wire configuration.
•Set EXCITATION switch to supply voltage 10V (factory setting).
•Set GAIN switch to position 4:
G20
Sensitivity Supplyvoltage
•Set ZERO switch to position 6 (zero = 1.730mV/V).
•Load the transducer with the required full scale and set the voltage full scale
Vm(current end scale Im).
•Check that Vout = 10V (Iout = 20mA) for the zero point, if this is not the
case, adjust the Gain (front) so that Vout = 10V (Iout = 20mA).
•Relieve the transducer, adjust Zero (front) to 0V (4mA).
•Check the amplification adjustment again.
•The measuring chain is now adjusted and ready for operation.

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8 Specifications
Type RM4220
Accuracy class 0.1
Zero adjustment
Max. with transducer resistance 87ΩmV/V 2.00
Amplifier adjustment
Maximum
Minimum
8500
80
SG full bridge
Bridge excitation voltage
SG resistance, min.
Input sensitivity
VDC
Ω
mV/V
5/10
80
0.3 ... 12
Current input
Input resistance nA
Ω typ.
5
1010
Current output
Maximum non‐linearity
Output resistance, typ.
Load resistance
mA
% FSO
MΩ
Ωmax.
4/20
0.015
40
800
Output voltage
Output short‐circuit current
Maximum non‐linearity
V
mA
% FSO
0/10 or 10
22
G = 1000 ⇒0.001
Filter (3rd order)
Maximum
Minimum / Standard
Hz
Hz 5000 10 %
3 10 %
Thermal drift
Input compensating voltage drift, typ.
Thermal sensitivity drift
V output
μV/°C
ppm/°C
10
0.2/5 G.
150
Max. current consumption mA 200
Mounting
Connection
Supply voltage VDC
Support rail DIN EN 60715
Screw terminals
24 8
Operating temperature range
Storage temperature range
Temperature stabilization time
Ignitability
°C
°C
min.
0 ... +70
-40 ... +85
15
VO (UL94)
Degree of protection IP20
Dimensions
Housing material
Color
mm 115  100  23
Polyamide PA
gray
Weight, approx. g 130

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9 Repair
Please include the following information when returning items to HBM: HBM
order number, reason for return, failure cause if known.