HBM FIT 7A User manual

Operating Manual | Bedienungsanleitung |
Manuel d'emploi | Istruzioni per l'uso
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FIT®7A

Hottinger Baldwin Messtechnik GmbH
Im Tiefen See 45
D-64239 Darmstadt
Tel. [phone]
Fax [phone]
[email protected]
www.hbm.com
Mat.: 7-2004.3924
DVS: A3924-1.1 HBM: public
09.2015
EHottinger Baldwin Messtechnik GmbH.
Subject to modifications.
All product descriptions are for general information only.
They are not to be understood as a guarantee of quality or
durability.
Änderungen vorbehalten.
Alle Angaben beschreiben unsere Produkte in allgemeiner
Form. Sie stellen keine Beschaffenheits- oder Haltbarkeits
garantie dar.
Sous réserve de modifications.
Les caractéristiques indiquées ne décrivent nos produits
que sous une forme générale. Elles n'impliquent aucune
garantie de qualité ou de durablilité.
Con riserva di modifica.
Tutti i dati descrivono i nostri prodotti in forma generica e non
implicano alcuna garanzia di qualità o di durata dei prodotti
stessi.

Operating Manual | Bedienungsanleitung |
Manuel d'emploi | Istruzioni per l'uso
English Deutsch Français Italiano
FIT®7A

2A3924-1.1 HBM: public FIT®7A
English
1 Safety instructions 4........................................
2 Markings used 8............................................
2.1 Symbols on the device 8......................................
2.2 The marking used in this document 8...........................
3 Conditions on site 10........................................
3.1 Protection against corrosion 10.................................
3.2 Deposits 10..................................................
4 Mechanical installation 12....................................
4.1 Important precautions during installation 12......................
4.2 Mounting and load application 13...............................
4.3 Connection for pressure compensation 14........................
5 Electrical connection 15......................................
6 Interfaces 18................................................
6.1 Connection of several load cells to a PC via RS-485 18............
6.2 Connection to a PC with an RS‐232 interface via the HBM interface
converter 19.................................................
6.3 Connection to a CANopen interface 19..........................
6.4 Connection to a DeviceNet interface 20..........................
6.5 Diagnostic interface connection 20..............................
7 Inputs and outputs 21........................................
7.1 Inputs 21....................................................
7.2 Outputs 22...................................................

FIT®7A A3924-1.1 HBM: public 3
8 Operation via software 25....................................
9 Waste disposal and environmental protection 25..............
10 Specifications 26............................................
11 Dimensions 26..............................................

Safety instructions
4A3924-1.1 HBM: public FIT®7A
1 Safety instructions
Appropriate use
Transducers of the FIT7A type series are designed solely
for technical weighing applications within the application
limits detailed in the specifications. Any other use is not
appropriate.
Any person instructed to carry out installation, commis
sioning or operation of the transducer must have read
and understood the Operating Manual and in particular
the technical safety instructions.
In the interests of safety, the transducer should only be
operated by qualified personnel and as described in the
Operating Manual. It is also essential to comply with the
legal and safety requirements for the application con
cerned during use. The same applies to the use of
accessories.
The transducer is not intended for use as a safety com
ponent. Please also refer to the "Additional safety pre
cautions" section. Proper and safe operation requires
proper transportation, correct storage, siting and mount
ing, and careful operation.
Operating conditions
SPlease observe the permissible maximum values
stated in the specifications for:
- Limit load
- Limit load at max. eccentricity
- Limit lateral loading
- Breaking loads
- Temperature limits

Safety instructions
FIT®7A A3924-1.1 HBM: public 5
- Limits of electrical load-carrying capacity
SPlease note that when several transducers are
installed in a scale, there is not always an even distri
bution of load on the individual transducers.
SThe transducers can be used as machine elements.
When used in this manner, it must be noted that, to
favor greater sensitivity, the transducer is not
designed with the safety factors usual in mechanical
engineering.
SThe transducer must not be modified from the design
or safety engineering point of view except with our
express agreement.
SThe transducer is maintenance-free.
SIn accordance with national and local environmental
protection and material recovery and recycling regula
tions, old transducers that can no longer be used
must be disposed of separately and not with normal
household garbage, see Chapter 9, Page 25.
Qualified personnel
Qualified persons means persons entrusted with the
installation, fitting, commissioning and operation of the
product who possess the appropriate qualifications for
their function.
This includes people who meet at least one of the three
following requirements:
SKnowledge of the safety concepts of measurement
and automation technology is a requirement and as
project personnel, they must be familiar with these
concepts.
SAs measurement or automation plant operating per
sonnel, they have been instructed how to handle the

Safety instructions
6A3924-1.1 HBM: public FIT®7A
machinery. They are familiar with the operation of the
equipment and technologies described in this docu
mentation.
SAs commissioning engineers or service engineers,
they have successfully completed the training to qual
ify them to repair the automation systems. They are
also authorized to activate, ground and label circuits
and equipment in accordance with safety engineering
standards.
Working safely
SThe device must not be directly connected to the
power supply system. The supply voltage must be
between 10 and 30 VDC.
SError messages should only be acknowledged once
the cause of the error is removed and no further dan
ger exists.
SMaintenance and repair work on an open device with
the power on may only be carried out by trained per
sonnel who are aware of the dangers involved.
SAutomation equipment and devices must be designed
in such a way that adequate protection or locking
against unintentional actuation is provided (e.g.
access checks, password protection, etc.).
SFor those devices operating in networks, safety pre
cautions must be taken both in terms of hardware and
software, so that a line break or other interruptions to
signal transmission do not cause undefined states or
loss of data in the automation device.
SAfter making settings and carrying out activities that
are password-protected, ensure that any controls that
may be connected remain in a safe condition until the
switching performance of the device has been tested.

Safety instructions
FIT®7A A3924-1.1 HBM: public 7
Additional safety precautions
Additional safety precautions to meet the requirements of
the relevant national and local accident prevention regu
lations must be taken in plants where malfunctions could
cause major damage, loss of data or even personal
injury.
The scope of supply and performance of the transducer
covers only a small area of measurement technology.
Before starting up the transducer in a system, a project
planning and risk analysis must first be implemented,
taking into account all the safety aspects of measure
ment and automation technology so that residual risks
are minimized. This particularly concerns personal and
machine protection. The transducers function passively
and cannot implement any (safety-relevant) cutoffs. In
the event of a fault, the relevant precautions must estab
lish safe operating conditions.
General dangers of failing to follow the safety
instructions
The transducer corresponds to the state of the art and is
reliable. The transducer may give rise to residual dangers
if it is inappropriately installed or operated.

Markings used
8A3924-1.1 HBM: public FIT®7A
2 Markings used
2.1 Symbols on the device
Statutory waste disposal mark
In accordance with national and local environmental pro
tection 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.
Also see Section 9 on Page 25.
CE mark
The CE mark enables the manufacturer to guarantee that
the product complies with the requirements of the rele
vant EC directives (the Declaration of Conformity can be
found on the HBM website (www.hbm.com) under
HBMdoc).
2.2 The marking used in this document
Important instructions for your safety are specifically
identified. It is essential to follow these instructions in
order to prevent accidents and damage to property.
Symbol Significance
WARNING This marking warns of a potentially dangerous situ
ation in which failure to comply with safety require
ments can result in death or serious physical injury.
Note This marking draws your attention to a situation in
which failure to comply with safety requirements can
lead to damage to property.

Markings used
FIT®7A A3924-1.1 HBM: public 9
SignificanceSymbol
Important
This marking draws your attention to important in
formation about the product or about handling the
product.
Emphasis
See …
Italics are used to emphasize and highlight text and
identify references to sections, diagrams, or external
documents and files.

Conditions on site
10 A3924-1.1 HBM: public FIT®7A
3 Conditions on site
Series FIT7A load cells are hermetically encapsulated
and are therefore not at all sensitive to the influence of
moisture and humidity. The transducers achieve
protection class IP66 (when vent hose is properly
connected) in accordance with DIN EN60529. The load
cells should nevertheless be protected against the lasting
influence of moisture and humidity.
3.1 Protection against corrosion
The load cell must be protected against chemicals that
could attack the steel of the housing and base plate, or
the cable.
Notice
Acids and all substances that release ions also attack
stainless steels and their welded seams.
The resultant corrosion can cause the transducer to fail.
If this is the case, you must provide appropriate means of
protection.
The sealing element for load application comprises a soft
bellows made from silicone rubber. Substances that
could attack this material must not be used.
3.2 Deposits
Dust, dirt and other foreign matter must not be allowed to
accumulate sufficiently to divert some of the measuring

Conditions on site
FIT®7A A3924-1.1 HBM: public 11
force onto the housing, thus invalidating the measured
value (force shunt).
Do not use hard or pointed objects when cleaning the
gap between the load application thrust piece and the
housing. Be very careful during cleaning, making sure
that you do not damage the silicone rubber bellows.

Mechanical installation
12 A3924-1.1 HBM: public FIT®7A
4 Mechanical installation
4.1 Important precautions during
installation
SHandle the transducer with care.
SWelding currents must not be allowed to flow over the
transducer. If there is a risk that this might happen,
you must provide a suitable low-ohm connection to
electrically bypass the transducer. HBM provides the
highly flexible EEK ground cable for this purpose, for
example, that is screwed on above and below the
transducer.
SMake sure that the transducer cannot be overloaded.
WARNING
There is a danger of the transducer breaking if it is over
loaded. This can cause danger for the operating person
nel of the system in which the transducer is installed.
Implement appropriate safety measures to avoid
overloads or to protect against the resulting dangers.
Notice
Load cells are precision measuring elements and need to
be handled carefully. Dropping or knocking the trans
ducer may cause permanent damage. Make sure that the
transducer cannot be overloaded, including while it is
being mounted.

Mechanical installation
FIT®7A A3924-1.1 HBM: public 13
4.2 Mounting and load application
Secure the load cells in the four mounting holes. A
platform for load application can be mounted on top. The
screws and tightening torques to be used are given in the
table below:
Mounting Thread Min. property class Tightening torque 1)
On mounting plate M8 10.9 25N⋅m
For load application M6 10.9 14N⋅m
1) Recommendedvalue for the specified property class. Please comply with the screw
manufacturer's instructions with regard to screw dimensions.
Mounting plate
(not included among
the items supplied)
Connection for valve coupling plug
(included among the items supplied)
Socket 1
Socket 2*)
*) Version E only Mounting plate flatness <0.02 mm
Load application
center of platform
Platform
(not included among
the items supplied)
Fig. 4.1 Load application and installation
Important
The flatness of the mounting plate surface to which the
load cell is attached must be better than 0.02mm.

Mechanical installation
14 A3924-1.1 HBM: public FIT®7A
4.3 Connection for pressure
compensation
The load cell housing is fitted with a connection for
pressure compensation.
Important
Changes in air pressure will also affect the measurement
result, if you do not connect the valve coupling plug (the
load cell is then sealed).
Connection in a dry environment
Fit the valve coupling plug, to ensure pressure
compensation.
Connection in a damp environment
In a damp environment, e.g. if the load cell can get wet
when using liquid cleaning agents for cleaning, you must
take suitable precautions to ensure that moisture cannot
get into the load cell.
Connect the valve coupling plug with a suitable hose that
leads into a dry area. If you use a number of load cells,
you can interconnect them in a pressure compensation
loop.

Electrical connection
FIT®7A A3924-1.1 HBM: public 15
5 Electrical connection
Notice
Electronic components are sensitive to electrostatic dis
charge (ESD). So you must discharge your own static
electricity before touching the connector plugs.
The standard version of the load cell comes with an 8-pin
device socket. The extended version E has a second
8-pin device socket.
Device sockets 1 and 2
8
2
3
4
5
1
7
6
Fig. 5.1 M12 device socket, 8‐pin

Electrical connection
16 A3924-1.1 HBM: public FIT®7A
FIT7A pin assignment - type S
Device socket 1
Pin RS‐485 CANopen/
DeviceNet
Wiring code for
1-KAB1651) Wiring code for 1-KAB1731)
1 GND GND White White
2 - - Brown Brown
3 RA CAN High IN Green Green
4Trigger input2) Trigger input2) Yellow Yellow
5 RB CAN Low IN Gray Gray
6 TB CAN Low OUT Pink Black
7 TA CAN High OUT Blue Blue
8 UB1 UB1 Red Red
1) For digital load cells, HBM recommends two cable types, 1-KAB165 or 1-KAB173, depending on
the application. Detailed information about these cables is available in data sheet B3643, which
can be found under "Product Data Sheet & Literature" on our website http://www.hbm.com/fit7a
2) The trigger input is referenced to the GND of pin 1.

Electrical connection
FIT®7A A3924-1.1 HBM: public 17
FIT7A pin assignment - type E
Device socket 1 ‒ digital communication
Pin RS‐485 CANopen/
DeviceNet
Wiring code for
1-KAB1651) Wiring code for 1-KAB1731)
1 GND GND White White
2Diagnosis RbTb Diagnosis RbTb Brown Brown
3 RA CAN High IN Green Green
4Diagnosis RaTa Diagnosis RaTa Yellow Yellow
5 RB CAN Low IN Gray Gray
6 TB CAN Low OUT Pink Black
7 TA CAN High OUT Blue Blue
8 UB1 UB1 Red Red
Device socket 2 ‒ inputs and outputs
Pin Wiring code for
1-KAB1651) Wiring code for 1-KAB1731)
1 - White White
2 IN2 Brown Brown
3 OUT2 Green Green
4 IN1 Yellow Yellow
5 OUT4 Gray Gray
6 OUT3 Pink Black
7 OUT1 Blue Blue
8 UB22) Red Red
1) For digital load cells, HBM recommends two cable types, 1-KAB165 or 1-KAB173, depending on
the application. Detailed information about these cables is available in data sheet B3643, which
can be found under "Product Data Sheet & Literature" on our website http://www.hbm.com/fit7a
2) For UB2, choose either the same voltage source as for UB1, or a separate voltage source. In both
cases, the signals are referenced to the GND with which pin 1 of socket 1 is connected. If a
separate voltage source is chosen for the inputs and outputs, this must be connected with the
common GND of pin 1.

Interfaces
18 A3924-1.1 HBM: public FIT®7A
6 Interfaces
The load cell can be provided with an RS‐485 interface, a
CANopen interface, or a DeviceNet interface, as
required. The reference potential of all the interface
signals is GND (supply ground) of device socket 1.
6.1 Connection of several load cells to a
PC via RS-485
Line termination Line termination
TB
TA
RB
RA
PC = Master FIT7A_1 = Slave 01 FIT7A_89 = Slave 89
...
500 Ω
500 Ω
500 Ω
500 Ω
500 Ω
500 Ω
500 Ω
500 Ω
+5 V
+5 V
+5 V
+5 V
TxD on/off RxD
TB TA
TR
RB RA
TxD on/off RxD
TB TA
TR
RB RA
TxD on/off RxD
TB TA
TR
RB RA
Fig. 6.1 Bus connection via RS‐485
Up to 89 load cells can be connected via the RS‐485
interface to a common bus line, the total length of which