HBM VKD2R-8 User manual

VKD2R-8
ENGLISH DEUTSCH
Mounting Instructions
Montageanleitung

Hottinger Brüel & Kjaer GmbH
Im Tiefen See 45
D-64293 Darmstadt
Tel. [phone]
Fax [phone]
[email protected]
www.hbkworld.com
Mat.:
DVS: A01144 03 X00 01
11.2021
EHottinger Brüel & Kjaer 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 allge
meiner Form. Sie stellen keine Beschaffenheits- oder
Haltbarkeitsgarantie dar.

VKD2R-8
ENGLISH DEUTSCH
Mounting Instructions

VKD2R-8
TABLE OF CONTENTS
2
TABLE OF CONTENTS
1 Safety instructions 3................................................
2 Markings used 5....................................................
2.1 The marking used in this document 5..................................
2.2 Markings used on the product 5.......................................
3 Introduction and appropriate use 6....................................
4 Mechanical construction 7...........................................
4.1 Mounting 7........................................................
5 Electrical connection 9..............................................
5.1 Cable connection 9..................................................
5.2 Clamp connection 10.................................................
5.3 Power supply 10.....................................................
5.4 Connection to a computer 11..........................................
5.5 RS‐485 4‐wire bus 12.................................................
5.6 RS‐485 2‐wire bus 14.................................................
5.7 Connecting VKD2R‐8 with WTX110-D 15.................................

3
VKD2R-8
SAFETY INSTRUCTIONS
1 SAFETY INSTRUCTIONS
Appropriate use
The junction box is to be used exclusively for interconnecting the interfaces, the power
supply and the bus termination. Use for any purpose other than the above shall be
deemed to be not in accordance with the regulations.
In the interests of safety, the junction box should only be used as described in the Mount
ing Instructions. 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 junction box is not a safety element as defined under Appropriate use. For safe and
trouble‐free operation, this junction box must not only be correctly transported, stored,
sited and installed, but must also be carefully operated and maintained.
General dangers of failing to follow the safety instructions
The junction box is a state of the art unit and as such is fail‐safe. The junction box may
give rise to further dangers if it is inappropriately installed and operated by untrained
personnel.
Any person instructed to carry out installation, commissioning, maintenance or repair of a
junction box must have read and understood the Mounting Instructions and in particular
the technical safety instructions.
Remaining dangers
The scope of supply and list of components provided with the junction box cover only
part of the scope of connection technique. In addition, equipment planners, installers and
operators should plan, implement and respond to the safety engineering considerations
of connection technique in such a way as to minimize remaining dangers. Prevailing regu
lations must be complied with at all times. There must be reference to the remaining dan
gers connected with connection technique.
Unauthorized conversions and modifications are prohibited
The junction box must not be modified from the design or safety engineering point of
view except with our express agreement. Any modification shall exclude all liability on our
part for any resulting damage.
Qualified personnel
The junction box is only to be installed by qualified personnel strictly in accordance with
the technical data and with the rules and safety regulations which follow. It is also essen
tial to comply with the legal and safety requirements for the application concerned. The
same applies to the use of accessories.

VKD2R-8
SAFETY INSTRUCTIONS
4
Qualified personnel means persons entrusted with the installation, assembly, commis
sioning and operation of the product who possess the appropriate qualifications for their
function.
Conditions on site
Do not allow the junction box to become dirty or damp.
Maintenance
The junction box is designed to provide degree of protection IP65 (dust protection,
protection against water jets). You must make regular checks to ensure that the rubber
seal in the cover and the screw connections is not leaking.
Accident prevention
The relevant accident prevention regulations must be taken into consideration.
Neither the design of the device nor any technical safety aspects may be modified with
out the express permission of Hottinger Brüel & Kjaer GmbH. Any modification excludes
Hottinger Brüel & Kjaer GmbH from any and all liability for any damage resulting there
from.
It is strictly forbidden to carry out any repairs and soldering work on the motherboards or
to replace any components. Repairs may only be carried out by persons authorized
thereto by Hottinger Brüel & Kjaer GmbH.
SDuring installation and when connecting the cables, take action to prevent electro
static discharge as this may damage the electronics.
SThe required power supply is an extra‐low voltage (6...30 V) with safe disconnection
from the mains.
SWhen connecting additional devices, comply with the safety requirements for electri
cal measurement, control, regulatory and laboratory equipment (EN61010).
SAll the interconnecting cables must be screened cables. The screen must be con
nected extensively to ground on both sides.

5
VKD2R-8
MARKINGS USED
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
CAUTION This marking warns of a potentially dangerous
situation in which failure to comply with safety
requirements can result in slight or moderate physical
injury.
NOTICE 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.
Tip
This marking indicates application tips or other
information that is useful to you.
Information
This marking draws your attention to information
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.
uThis marking indicates an action in a procedure
2.2 Markings used on the product
CE mark
The CE mark enables the manufacturer to guarantee that the
product complies with the requirements of the relevant EC guide
lines. Please find the Declaration of Conformity under
www.hbm.com.

VKD2R-8
INTRODUCTION AND APPROPRIATE USE
6
3 INTRODUCTION AND APPROPRIATE USE
The VK... junction box is used to interconnect the serial interfaces (RS‐485), the power
supply and the RS‐485 bus termination.
It is preferable for the following HBM products to be wired in the RS‐485 bus:
SDigital transducers: C16i, FIT
SDigital transducer electronics: AED9101B, AED9201A
SDigital measurement chains with transducer electronics PAD-RS485, AD105D-RS485,
AD112D-RS485
SScale electronics WTX110-D with digital transducers.
The RS‐485 bus can be wired as a 2‐wire‐ or a 4‐wire bus. The form of connection to be
used will depend on the particular type of digital transducer or measuring amplifier (see
the respective Operating Manuals).
HBM product RS‐485 bus
C16i 4‐wire
FIT 4‐wire
AED9101B 2 / 4‐wire
AED9201A 4‐wire
PAD-RS485, AD112D-RS485 4‐wire
AD105D-RS485 2‐wire
WTX110-D 4‐wire
Up to eight digital transducers / measuring amplifiers can be connected together to a
VK... (connections Load Cell 1..8). The cable to the control computer is connected to the
Output clamp.
If several junction boxes are needed in a bus, up to 7 digital transducers / measuring am
plifiers can be connected to a VK... (connections Load Cell 1..7). Connection Load Cell 8 is
then used to connect to the first junction box. The cable to the control computer is con
nected to the Output clamp.

7
VKD2R-8
MECHANICAL CONSTRUCTION
4 MECHANICAL CONSTRUCTION
The junction box has the following functions:
SMechanical protection (IP65)
SPower supply for the electrical bus termination
STransducer excitation
SBus operation for 2‐wire and 4‐wire RS‐485 serial interfaces
SEMC‐tested
The connection cable exits the casing via screw connections.
Bus termination switch
Bus output
8th input/
Bus input
Fig. 4.1 Mechanical construction of the VK...
4.1 Mounting
The VK... junction boxes should preferably be mounted such that the cable bushings
point downward (see mounting direction, Fig. 4.2). In this way, better protection against
ingress of water is provided.

VKD2R-8
MECHANICAL CONSTRUCTION
8
(250)
(260)
(100)
(110)
(128)
(264.1)
278
0
25
50
75
100 125 150
175
200
with rubber sealing (mounted) 37.5
7x M12, a.f. 14 for
cable diameter
3 ... 6 mm
2x M16, a.f. 17 for
cable diameter
5 ... 9 mm
Mounting direction
∅7
Fig. 4.2 Mounting dimensions of the VK...
Junction box top view
1. 4.
2.
3.
Tighten the mounting
screws in the follow
ing order:
Tightening torque of the cover
plate screws: 0.7 N⋅m
Fig. 4.3 Tightening the mounting screws
Information
Please tighten the lid screws with a torque of 0.7 Nm to ensure the specified IP degree of
protection and the highest possible EMC protection. The sealing washers under the lid
screws must not be removed.

9
VKD2R-8
ELECTRICAL CONNECTION
5 ELECTRICAL CONNECTION
A connection diagram is attached to the lid of the VK.... When making the connections,
please ensure that the cable wires do not protrude beyond the connection clamps (risk of
looping). Make sure that the cable screen is properly connected to the screw connec
tions.
5.1 Cable connection
Only an interconnecting cable with a screen grounded on two sides (and metal connec
tors) is to be used as the connecting cable between the VK... and its partner. The screen
is brought extensively into contact on both sides at the PG gland (and at the casing of the
metal connector). If the partner has no metal connector, the cable screen must be exten
sively connected to ground. If there are major ground potential differences between the
VK... and the peer, an equipotential bonding conductor must also be provided.
For optimum results when assembling the cable, proceed as follows:
SCut off outer cable sheath and expose braided screen over a length of approx. 10 ...
15 mm, depending on the cable diameter.
SPush dome nut and lamellar insert with sealing ring onto the cable.
SBend braided screen outwards at a right angle (90°).
SFold braided screen towards outer sheath, i.e. by another 180°.
SPush gland base up to braided screen and turn briefly around both sides of the cable
axis.
SPush lamellar insert with sealing ring into gland base and snap anti‐rotation element
into place.
STighten the cap nut to 3 Nm to ensure the degree of protection, while holding the
intermediate connection piece.
screened cable
Dome nut
Sealing ring
Lamellar insert
Braided screen
Gland body
Fig. 5.1 Assembly of a connection cable

VKD2R-8
ELECTRICAL CONNECTION
10
5.2 Clamp connection
All nine of the connection blocks in the VK... are interconnected in series. The VK... also
contains terminating resistors that can be brought into circuit for the RS‐485 bus.
Each clamp has the following connections:
VK...‐Connection Meaning
Screen screen connection
TA RS‐485, transmitting line A (= T-)
TB RS‐485, transmitting line B (=T+)
RA RS‐485, receiving line A (=R-)
RB RS‐485, receiving line B (=R+)
UB Power supply +, max. 30 VDC
GND Power supply ground
TA,TB, RA, RB relate to the 4‐wire bus connection.
The screen connection should only be used if it is not possible to connect the cable
screen in the screw connections. With this method, EMC‐proofing under EN 45 501 is
restricted, which can lead to errors within the data transmission when there are
electromagnetic interference fields..
The choice of bus wiring depends on the digital transducers / measuring amplifiers be
ing used (see the table in section 1). A mixed 2‐wire / 4‐wire bus version is not possible.
Long line lengths (up to 1000 m) can be implemented with the aid of the RS‐485 bus
driver. The length specification relates to all the cabling (electric main and transducer
lines in total).
Important
All unused cable bushings must be closed off with the plugs provided for the purpose.
Tighten the associated swivel nut in each case to stop moisture penetrating.
5.3 Power supply
The power supply complies with the operating voltage of the digital transducers / mea
suring amplifiers connected in the particular case. The relevant Operating Manual should
be consulted for this.
Product Operating voltage range [VDC]
C16i 6...15
FIT, 1st generation 6...15

11
VKD2R-8
ELECTRICAL CONNECTION
Operating voltage range [VDC]Product
FIT, 2nd generation 6...30
FIT, 3rd generation 10...30
AED9101B 6...30
AED9201A 18...30
PAD-RS485, AD112D-RS485 6...15
AD105D-RS485 6...15
WTX110-D 12 (C16i)
The supply voltage for the VK... is minimum 6 VDC and maximum 30 VDC. The LED on the
circuit board indicates that the supply voltage is present.
When several devices and long cables to carry the supply voltage are connected, pay
attention to the voltage drop over these cables.
5.4 Connection to a computer
The junction box can be wired for two interface variants (2‐wire / 4‐wire RS‐485).
When connecting digital transducers / measuring amplifiers to the COM port of a PC
(RS‐232), you need an interface converter (from HBM: 1‐SC232/422B).
Basically, screened cables should be used for interface wiring, with the cable screen be
ing connected to the VK... enclosure via the screw connections.
The screen of the electric main is connected to the screen of the transducer cable via the
VK... screw connections (not to the supply ground).
If necessary, a separate cable should be used to produce equipotential bonding between
the bus nodes. The cable screen must not be used for this equipotential bonding. For
EMC reasons, it is advisable to use a double‐screened cable (from the HBM program, for
example: 3 x 2 x 0.14 m2, 4‐3301.0071).

VKD2R-8
ELECTRICAL CONNECTION
12
1‐SC232/422B Interface converter
RS‐232 ‐ RS‐485
UB: 8V...30VDC
RS‐485‐Bus digital transducer
TA TA
TB TB
RA RA
RB RB
GND GND
UB UB
Equivalent interface designation
TA = T- TB = T+
RA = R- RB = R+
COM‐Port PC
RxD TxD
TxD RxD
GND GND
SUB‐D plug SUB‐D plug
9‐pin 9‐pin
PIN PIN
2 = RxD 2 = RxD
3 = TxD 3 = TxD
5 = GND 5 = GND
Fig. 5.2 Connecting a digital transducer / measuring amplifier (RS‐485 4‐wire) to a
computer via the interface converter
All the digital transducers/measuring amplifiers are wired in parallel by the VK.... The
transmitting lines only cross the receiving lines at the interface converter (see Fig. 5.2).
This does not apply to the RS‐485 2‐wire bus. Here all the nodes are wired in parallel
(even the master and the interface converter).
5.5 RS‐485 4‐wire bus
Using the RS‐485 interface, several digital transducers / measuring amplifiers can be
connected to a common bus line. Fig. 5.3 shows the principle of bus cabling for 4‐line
operation.

13
VKD2R-8
ELECTRICAL CONNECTION
4‐wire electric main
Line
termination
Line
termination
1000Ω
1000 Ω
1000 Ω
1000 Ω
1000 Ω
1000 Ω
1000 Ω
Computer = Master Bus nodes: Slave 00...........Slave 31
+5V
+5V
+5V
+5V
TB
TA
RB
RA
TxD on/off RxD TxD on/off RxD TxD on/off RxD
1000 Ω
Fig. 5.3 Bus structure of the 4‐wire bus (Standard design)
Bus operation of the digital transducers / measuring amplifiers is designed as a master/
slave configuration, with the digital transducers / measuring amplifiers implementing the
slave function.
In the diagram above, the marked terminating resistors of 1000 Ω are important for the
electrical function of the bus system. These resistors safeguard the rest level for the re
ceiver on the bus line. The electric main must only be connected to these resistors at the
ends of the cables.
For the local distribution of bus connections shown in the diagram, the master (generally
the control computer with an interface converter) and the most remote VK... contain the
terminating resistors. In this VK..., the terminating resistors must be switched on (switch
setting at the bus connection ON). An exception is the interconnection with the C16i digi
tal load cells and WTX110-D scale electronics (see Fig. 5.5 ). The interface converter
from HBM basically has bus terminating resistors that are ON. When using several VK...s,
it is then only necessary to activate the bus termination in one VK.... It is essential for the
bus terminations integrated in the digital transducers / measuring amplifiers to be deacti
vated (factory setting).
Rest level (there is no communication) on the RS‐485 electric main is produced in 4‐wire
operation when:
TB - TA y0.35 V and RB - RA y0.35 V

VKD2R-8
ELECTRICAL CONNECTION
14
5.6 RS‐485 2‐wire bus
Using the RS‐485 interface, several digital transducers / measuring amplifiers can be
connected to a common bus line. Fig. 5.4 shows the principle of bus cabling for 2‐wire
operation.
VK... connection RS‐485 2‐wire
Screen screen connection
TA RS‐485, TRA = transmitting / receiving line A (=TRA-)
TB RS‐485, TRB = transmitting / receiving line B (=TRB+)
RA Not in use
RB Not in use
UB Supply voltage +, max. 30 VDC
GND Power supply ground
2‐wire electric main
Line
termination
Line
termination
1000 Ω
1000 Ω1000 Ω
1000 Ω
+ 5V + 5V
Computer = Master Bus nodes: Slave 00.......Slave 31
T/RA
TxD on/off RxD TxD on/off RxD TxD on/off RxD
T/RB
Fig. 5.4 Bus structure of the 2‐wire bus RS‐485 (T/RB = T/R+, T/RA = T/R-)
Bus operation of the digital transducers / measuring amplifiers is designed as a master/
slave configuration, with the digital transducers / measuring amplifiers implementing the
slave function. All nodes (even the master) are wired in parallel.
In the diagram above, the marked terminating resistors of 1000 Ω are important for the
electrical function of the bus system. These resistors safeguard the rest level for the
receiver on the bus line. The electric main must only be connected to these resistors at
the ends of the cables.

15
VKD2R-8
ELECTRICAL CONNECTION
For the local distribution of bus connections shown in the diagram, the master (generally
the control computer with an interface converter) and the most remote VK... contain the
terminating resistors. In this VK..., the terminating resistors must be switched on (switch
setting at the bus connection ON). The interface converter from HBM basically has bus
terminating resistors that are ON. When using several VK...s, it is then only necessary to
activate the bus termination in one VK.... Switchable BUS terminations in the digital trans
ducers / amplifiers must be turned off.
For 2‐wire operation, the HBM interface converter must be set accordingly (see
1‐SC232/422B Operating Manual). However, here the digital transducers / measuring
amplifiers must be operated in half‐duplex mode (it is essential to set the COFxxx com
mand). The MSV?0; command must not be used, as it is not possible to interrupt data
output with the STP; command.
Rest level (there is no communication) on the RS‐485 electric main is produced in 2‐wire
operation when:
T/RB - T/RA y0.35 V
Communication between the master and the slaves is executed as half‐duplex commu
nication (sending a request through the master, then receiving the response from the
selected slave).
5.7 Connecting VKD2R‐8 with WTX110-D
VK…
(input, Signals
from C16i)
RS‐485 4‐wire VK…
(output)
WTX110-D
Screen connection Screen PG
KL1 (DWB)
TA RS‐485, transmitting line A (=T-) TA 4 RA (Rx-)
TB RS‐485, transmitting line B (=T+) TB 3 RB (Rx+)
RA RS‐485, receiving line A (=R-) RA 2 TA (Tx-)
RB RS‐485, receiving line B (=R+) RB 1 TB (Tx+)
KL3
GND Power supply ground GND 1 0V
UB Power supply +, 12 VDC UB 2 +12V

VKD2R-8
ELECTRICAL CONNECTION
16
WTX110-D
KL1 (DWB):
4 RA (Rx-)
3 RB (Rx+)
2 TA (Tx-)
1 TB (Tx+)
KL3:
1 0V
2 +12V
Screen con. PG
Fig. 5.5 Following the scheme of measuring C16i - VKD2R-8 - WTX110D
Information
When connecting the RS485 between the WTX110-D and VKD2R-8, the transmitting and
receiving lines must be connected crosswise (see Fig. 5.5).

VKD2R-8
ENGLISH DEUTSCH
Montageanleitung

VKD2R-8
INHALTSVERZEICHNIS
2
INHALTSVERZEICHNIS
1 Sicherheitshinweise 3...............................................
2 Verwendete Kennzeichnungen 5......................................
2.1 In dieser Anleitung verwendete Kennzeichnungen 5......................
2.2 Auf dem Gerät angebrachte Symbole 5.................................
3 bestimmungsgemäße Verwendung 6..................................
4 Mechanischer Aufbau 7.............................................
4.1 Montage 8.........................................................
5 Elektrischer Anschluss 9............................................
5.1 Kabelanschluss 9...................................................
5.2 Klemmenanschluss 10................................................
5.3 Spannungsversorgung 10.............................................
5.4 Anschluss an einen Rechner 11........................................
5.5 RS‐485‐4‐Draht‐Bus 12................................................
5.6 RS‐485‐2‐Draht‐Bus 14................................................
5.7 VKD2R‐8-Verschaltung mit WTX110-D und C16i 15........................