HBM FIT 7A User manual

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

Hottinger Brüel & Kjaer GmbH
Im Tiefen See 45
D-64293 Darmstadt
Tel. [phone]
Fax [phone]
[email protected]
www.hbm.com
Mat.: 7-0101.0057
DVS: A03924_02_YI0_00 HBM: public
07.2021
EHottinger Baldwin Messtechnik
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 durabilité.
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

2A03924_02_YI0_00 HBM: public FIT®7A
English
1 Safety instructions 3........................................
2 Markings used 6............................................
2.1 The marking used in this document 6...........................
2.2 Symbols on the device 6......................................
3 Conditions on site 7........................................
3.1 Protection against corrosion 7.................................
3.2 Deposits 7..................................................
4 Mechanical installation 8....................................
4.1 Important precautions during installation 8......................
4.2 Mounting and load application 8...............................
4.3 Connection for pressure compensation 9........................
5 Electrical connection 11......................................
6 Interfaces 14................................................
6.1 Connection of several load cells to a PC via RS-485 14............
6.2 Connection to a PC with an RS‐232 interface via the HBM interface
converter 15.................................................
6.3 Connection to a CANopen interface 15..........................
6.4 Connection to a DeviceNet interface 15..........................
6.5 Diagnostic interface connection 15..............................
7 Inputs and outputs 17........................................
7.1 Inputs 17....................................................
7.2 Outputs 17...................................................
8 Operation via software 21....................................
9 Waste disposal and environmental protection 21..............
10 Specifications 21............................................
11 Dimensions 22..............................................

Safety instructions
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1 Safety instructions
Appropriate use
Transducers of the FIT7A type series are designed solely for technical weigh
ing applications within the application limits detailed in the specifications. Any
other use is not appropriate.
Any person instructed to carry out installation, commissioning 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 concerned
during use. The same applies to the use of accessories.
The transducer is not intended for use as a safety component. Please also
refer to the "Additional safety precautions" section. Proper and safe operation
requires proper transportation, correct storage, siting and mounting, and care
ful operation.
Operating conditions
SPlease observe the permissible maximum values stated in the specifica
tions for:
- Limit load
- Limit load at max. eccentricity
- Limit lateral loading
- Breaking loads
- Temperature limits
- Limits of electrical load-carrying capacity
SPlease note that when several transducers are installed in a scale, there is
not always an even distribution 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.

Safety instructions
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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 regulations, old transducers that can no longer be
used must be disposed of separately and not with normal household
garbage, see Chapter 9, Page 21.
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 requirements:
SKnowledge of the safety concepts of measurement and automation technol
ogy is a requirement and as project personnel, they must be familiar with
these concepts.
SAs measurement or automation plant operating personnel, they have been
instructed how to handle the machinery. They are familiar with the operation
of the equipment and technologies described in this documentation.
SAs commissioning engineers or service engineers, they have successfully
completed the training to qualify them to repair the automation systems.
They are also authorized to activate, ground and label circuits and equip
ment 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 danger exists.
SMaintenance and repair work on an open device with the power on may
only be carried out by trained personnel who are aware of the dangers
involved.

Safety instructions
FIT®7A A03924_02_YI0_00 HBM: public 5
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 precautions must be taken
both in terms of hardware and software, so that a line break or other inter
ruptions 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-pro
tected, ensure that any controls that may be connected remain in a safe
condition until the switching performance of the device has been tested.
Additional safety precautions
Additional safety precautions to meet the requirements of the relevant national
and local accident prevention regulations must be taken in plants where mal
functions 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 sys
tem, a project planning and risk analysis must first be implemented, taking into
account all the safety aspects of measurement 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 establish 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 trans
ducer may give rise to residual dangers if it is inappropriately installed or oper
ated.

Markings used
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2 Markings used
2.1 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.
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.
2.2 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 21.
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).

Conditions on site
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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 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
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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 overloaded. This can cause
danger for the operating personnel 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 transducer may cause permanent damage. Make
sure that the transducer cannot be overloaded, including while it is being
mounted.
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:

Mechanical installation
FIT®7A A03924_02_YI0_00 HBM: public 9
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.
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).

Mechanical installation
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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 A03924_02_YI0_00 HBM: public 11
5 Electrical connection
Notice
Electronic components are sensitive to electrostatic discharge (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
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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 A03924_02_YI0_00 HBM: public 13
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
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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 can be as much as 500 m. Bus cabling for
4wire mode is shown in Fig. 6.1.
Remember that many PCs do not have an RS‐485 interface. In this case, you
need an interface converter, such as the HBM converter (see Section 6.2).

Interfaces
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6.2 Connection to a PC with an RS‐232 interface via the
HBM interface converter
RS‐232 8...30V
2/4-wire
RS‐485
TxD
RxD
GND
RxD
TxD
GND
Interface converter
RS‐232 - RS‐485
PC COM port
D-Sub plug, 9-pin
(PC)
PIN
2 = RxD
3 = TxD
5 = GND
UB: 10 …30VDC
RS‐485 bus
TA
TB
RA
RB
GND
Uv
TA (blue)
TB (black)
RA (green)
RB (gray)
GND
Uv(red, 10 ... 30VDC)
(white)
Equivalent designations:
TA = T-
RA = R-
TB = T+
RB = R+
D-Sub socket, 9-pin
(converter)
PIN
2 = TxD
3 = RxD
5 = GND
FIT7A
Fig. 6.2 Connection to a PC via the HBM interface converter
6.3 Connection to a CANopen interface
The interface is set up using the CANopen standard DS301. The load cell
address on delivery is 63.
6.4 Connection to a DeviceNet interface
The interface is set up using the DeviceNet specification, Release 2.0 ODVA.
The load cell address on delivery is 63.
6.5 Diagnostic interface connection
The real time values stored with the diagnostic function can be read out via this
interface. The load cell address on delivery is 31, the baud rate is fixed at
38600Bd.

Interfaces
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T/RB
T/RA
PC = Master FIT7A_1 = Slave 01 FIT7A_31 = Slave 31
...
500 Ω
500 Ω
500 Ω
500 Ω
+5 V
+5 V
TxD on/off RxD TxD on/off RxD TxD on/off RxD
Fig. 6.3 Connecting the diagnostic interface

Inputs and outputs
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7 Inputs and outputs
7.1 Inputs
Apply the control signals between the particular input and reference potential
(GND). In the standard version, the trigger input can be directly activated with
a logic signal (HCMOS), although voltages up to 12V are also possible. The
inputs of device socket 2 are suitable for the signals of a PLC. The reference
potential in both cases is GND of device socket 1. The table below shows the
allocation of logic states to the voltage values at the input. Levels between the
stated high and low levels produce undefined states!
Trigger input Inputs IN1, IN2
Reference potential GND GND
High level >4V >10V
Low level <1V <6V
Input resistance 70kΩ9kΩ
Function External trigger TAR, Break, RUN functions
Quiescent level High or low level1) Low level
Triggering event Transition from high to low
level
High level, debounced2)
1) Stable level at trigger input used. The other wire must be at low level or not connected.
2) Debouncing is dependent on the function set (IMD command), but not on the input used (device
socket 1 or 2).
7.2 Outputs
The output driver of the switch outputs is a PLC-compatible static switch
(High-Side driver). Power for switching must be supplied via external operating
voltage UB2. All the voltages apply to GND at device socket 1.
When an output is activated, a positive level is given on the corresponding
output line, voltage is dependent on UB2. The connected consumer is between
the output and the GND potential of the switching load supply:

Inputs and outputs
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Valve 1 Valve 2
Power
supply 1
Power
supply 2
Connector 1 Connector 2 Connector 1 Connector 2
Ub 1
GND 1
Ub 2
GND 2
FIT7A - 1 FIT7A - 2
OUTx OUTx
GND
connection
Fig. 7.1 GND potential and load circuit
Important
No GND potential is present at device socket 2, so you must connect the refer
ence potential (GND) of the load circuits with GND at device socket 1.
There are two distinctive cases when connecting GND potential:
1. The arrangement of the function blocks, i.e. the digital part for the switch
outputs and the part for supplying with operating voltage and the interface,
is physically separate (Fig. 7.2).
2. Both function blocks are inside a control cabinet (Fig. 7.3).
In the first case, make sure that the shields of both leads, as well as the GND
potential, are each connected with a wire with a minimum cross-section of
1.5 mm2. However, the individual leads must not take different routes, they
must be close together and of the same length. The total length of a conductor
must not exceed 10 m (Fig. 7.2).