How it Works
Beckhoff
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KL3356
User Manual
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Beckhoff KL3356, KS3356 User Manual

Documentation | EN
KL3356 and KS3356
Accurate 1 Channel Terminals for Resistance Bridges
2021-03-02 | Version: 2.4.0

Table of contents

Table of contents
1 Foreword ....................................................................................................................................................5
2 Product overview.......................................................................................................................................9
2.2 Technical data .................................................................................................................................10
2.3 Basic function principles ..................................................................................................................10
2.4 LEDs................................................................................................................................................15
3 Mounting and wiring................................................................................................................................16
3.1 Installation on mounting rails ...........................................................................................................16
3.2 Installation instructions for enhanced mechanical load capacity .....................................................18
3.3 Connection ......................................................................................................................................19
3.3.1 Connection system .......................................................................................................... 19
3.3.2 Wiring............................................................................................................................... 21
3.3.3 Shielding .......................................................................................................................... 22
3.3.4 Connection....................................................................................................................... 23
3.4 Application example ........................................................................................................................24
3.5 ATEX - Special conditions (standard temperature range) ...............................................................25
3.6 Continuative documentation for ATEX and IECEx ..........................................................................26
4 KS2000 Configuration Software.............................................................................................................27
4.1 KS2000 - Introduction......................................................................................................................27
4.2 Parameterization with KS2000 ........................................................................................................28
4.3 Settings............................................................................................................................................30
4.4 Sample program for KL register communication via EtherCAT on KL3314 exemplary...................33
5 Access from the user program ..............................................................................................................36
5.1 Process image.................................................................................................................................36
5.2 Mapping...........................................................................................................................................36
5.3 Control and status bytes..................................................................................................................38
5.4 Register overview ............................................................................................................................41
5.5 Register description.........................................................................................................................44
5.6 Examples of Register Communication ............................................................................................52
5.6.1 Example 1: reading the firmware version from Register 9............................................... 52
5.6.2 Example 2: Writing to an user register............................................................................. 52
6 Appendix ..................................................................................................................................................56
6.1 Support and Service ........................................................................................................................56
KL3356 and KS3356 3Version: 2.4.0
Table of contents
KL3356 and KS33564 Version: 2.4.0
Foreword

1 Foreword

1.1 Notes on the documentation

Intended audience
This description is only intended for the use of trained specialists in control and automation engineering who are familiar with the applicable national standards. It is essential that the documentation and the following notes and explanations are followed when installing and commissioning these components. It is the duty of the technical personnel to use the documentation published at the respective time of each installation and commissioning.
The responsible staff must ensure that the application or use of the products described satisfy all the requirements for safety, including all the relevant laws, regulations, guidelines and standards.
Disclaimer
The documentation has been prepared with care. The products described are, however, constantly under development.
We reserve the right to revise and change the documentation at any time and without prior announcement.
No claims for the modification of products that have already been supplied may be made on the basis of the data, diagrams and descriptions in this documentation.
Trademarks
Beckhoff®, TwinCAT®, EtherCAT®, EtherCATG®, EtherCATG10®, EtherCATP®, SafetyoverEtherCAT®, TwinSAFE®, XFC®, XTS® and XPlanar® are registered trademarks of and licensed by Beckhoff Automation GmbH. Other designations used in this publication may be trademarks whose use by third parties for their own purposes could violate the rights of the owners.
Patent Pending
The EtherCAT Technology is covered, including but not limited to the following patent applications and patents: EP1590927, EP1789857, EP1456722, EP2137893, DE102015105702 with corresponding applications or registrations in various other countries.
EtherCAT® is registered trademark and patented technology, licensed by Beckhoff Automation GmbH, Germany.
Copyright
© Beckhoff Automation GmbH & Co. KG, Germany. The reproduction, distribution and utilization of this document as well as the communication of its contents to others without express authorization are prohibited. Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or design.
KL3356 and KS3356 5Version: 2.4.0
Foreword

1.2 Safety instructions

Safety regulations
Please note the following safety instructions and explanations! Product-specific safety instructions can be found on following pages or in the areas mounting, wiring, commissioning etc.
Exclusion of liability
All the components are supplied in particular hardware and software configurations appropriate for the application. Modifications to hardware or software configurations other than those described in the documentation are not permitted, and nullify the liability of Beckhoff Automation GmbH & Co. KG.
Personnel qualification
This description is only intended for trained specialists in control, automation and drive engineering who are familiar with the applicable national standards.
Description of instructions
In this documentation the following instructions are used. These instructions must be read carefully and followed without fail!
DANGER
Serious risk of injury!
Failure to follow this safety instruction directly endangers the life and health of persons.
WARNING
Risk of injury!
Failure to follow this safety instruction endangers the life and health of persons.
CAUTION
Personal injuries!
Failure to follow this safety instruction can lead to injuries to persons.
NOTE
Damage to environment/equipment or data loss
Failure to follow this instruction can lead to environmental damage, equipment damage or data loss.
Tip or pointer
This symbol indicates information that contributes to better understanding.
KL3356 and KS33566 Version: 2.4.0

1.3 Documentation issue status

Version Comment
2.4.0 • Register description extended
• Technical data updated
• Application example corrected
• New title page
2.3.0 • Example program added to chapter KS2000 Configuration software
• Design of the safety instructions adapted to IEC 82079-1
2.2.0 • Chapter Basic Function Principles updated
2.1.0 • Technical data updated
2.0.0 • Migration
1.5.0 • Description of process image and mapping updated
• Register description updated and corrected
1.4 • Register description updated
• Installation instructions revised
1.3 • LED description adapted to redesign with new LED prism (8 LEDs in use)
• Register description corrected and extended
• Firmware and hardware versions updated
1.2 • Images adapted to redesign with LED prism (4 LEDs in use)
• Technical data updated
1.1 • Description of process data, control and status bytes revised
• Calibration stabilization added
• Wiring description (power contacts) updated and example added
• User calibration added
• Description of the KL3356 parameterization with the KS2000 Configuration software updated
1.0 • Technical data updated
• Basic function principles revised
• English translation available
0.4 • Register descriptions extended
0.3 • Technical data updated
• Description of KL3356 parameterization via KS2000 Configuration software added
• Register description extended
0.2 • Technical data added
• Examples for register communication added
• Information on installation and connection added
0.1 First preliminary version
Foreword
KL3356 and KS3356 7Version: 2.4.0
Foreword
Firmware and hardware versions
Documenta­tion Version
2.4.0 2D 07
2.3.0 2D 06
2.2.0 2D 06
2.1.0 2D 06
2.0.0 2D 06
1.5.0 2D 05
1.4 2B 03
1.3 2B 02
1.2 2A 01
1.1 1F 00
1.0 1A 00
0.4 1A 00
0.3 1A 00
0.2 1A 00
0.1 1A 00
The firmware and hardware versions (delivery state) can be found in the serial number printed on the side of the terminal.
KL3356, KS3356
Firmware Hardware
Syntax of the serial number
Structure of the serial number: WWYYFFHH
WW - week of production (calendar week) YY - year FF - firmware version HH - hardware version
Example with serial number 35 04 1A 00:
35 - week of production 35 04 - year of production 2004 1A - firmware version 1A 00 - hardware version 00
KL3356 and KS33568 Version: 2.4.0

2 Product overview

2.1 Introduction

Product overview
Fig.1: KL3356
The KL3356 analog input terminal permits direct connection of a resistance bridge. An improved input circuit makes the KL3356 significantly more accurate than the KL3351. The ratio between the bridge voltage U and the supply voltage U complete circuit is re-calibrated at least every 3 minutes. This procedure can be synchronized by the control in order to prevent the calibration leading to a delay in the production process.
is determined in the input circuit. In order to achieve good long-term stability, the
ref
D
KL3356 and KS3356 9Version: 2.4.0
Product overview

2.2 Technical data

Technical data KL3356, KS3356
Inputs 2, for one resistor bridge
Signal voltage U
D
Input resistance (UD) >1MΩ
Supply voltage for the measuring bridge (UV) 5V...12V (recommended)
Reference voltage U
Input resistance (U
Ref
) >200kΩ
ref
Resolution 16bits
Conversion time <250ms, configurable
Measuring error (total measuring range) ±0.01% of the full scale value, self-calibration
Bit width in the K-bus I/O 2 x 16bit user data, 2 x 8bit control/status
Bit width in the input process image 2data words, 2status byte
Bit width in the output process image 2data words, 2control byte
Power supply for the electronics via the K-Bus
Current consumption from K-bus typically 85mA
Weight approx. 75g
Dimensions (W x H x D) approx. 15mmx100mmx70mm
Mounting [}16]
Pluggable wiring [}19]
Permissible ambient temperature range during operation
Permissible ambient temperature range during storage
Permissible relative air humidity 95%, no condensation
Vibration/shock resistance conforms to EN60068-2-6/EN60068-2-27, see also
EMC immunity/emission conforms to EN61000-6-2 / EN61000-6-4
Protection class IP20
Installation position variable
Approvals / markings
Ex marking ATEX: II 3 G Ex nA IIC T4 Gc
-20mV...+20mV
max. 12V
on 35mm mounting rail conforms to EN60715
at all KSxxxx series terminals
0°C ... + 55°C
-25°C ... + 85°C
Installation instructions [}18] for enhanced mechanical load capacity
CE, cULus, ATEX [}25]

2.3 Basic function principles

The KL3356 Analog Input Terminal is used to acquire the supply voltage to a load cell as a reference voltage, and simultaneously the differential voltage that is proportional to the force acting on the cell. The reference and the differential voltages are measured alternately by the same converter. The quotient of the differential and the reference voltages corresponds to the force that is acting on the load cell. Deviations in the analog input stages (temperature drift, long-term drift etc.) are checked by regular calibration, and compensated to bring the measurement within the permitted tolerance range.
Strain gauge measuring signal
The strain gauge measuring signal is acquired at fixed intervals with a resolution of 16bits (+ sign). This value is saved as a data word, without sign, in register R2 [}44]. The sign is represented in bit SW.0 [}44]
of the status word. The length of the sampling interval is directly determined by the filter constant in register R37 [}48].
KL3356 and KS335610 Version: 2.4.0
Product overview
Strain gauge reference signal
The strain gauge reference signal is also acquired with a resolution of 16bits (+ sign) at longer intervals. This value is saved as a data word, without sign, in register R3 [}45]. The sign is represented in bit SW.1 [}44] of the status word. The length of the sampling interval is defined, in multiples of 100ms, in register R39 [}49].
Calculating the weight
Every time the analog signal is acquired, the weight that it indicates is calculated. This is composed of the ratio between the measuring signal and the reference signal, and of a number of calibrations:
YR = (U YS = YR x A YH = YS x AH + B Y
OUT
Y
OUT
/U
S
Ref
) x (E
H
Diff
= YHxAA + B
= (YH+ BA) xA
/Cn) x 1000 / 500 (1.0) Calculation of the raw weight value
max
(1.1) Scale factor (1.2) Manufacturer scaling
A
A
(1.3.0)
(1.3.1)
User scaling (if R32.10 [}47]=0
User calibration (if R32.10 [}47]=1
)
bin
)
bin
Key
Name Name Unit Register
U
U
E
C
A
B
Measuring signal from the load cell [1]
Diff
Reference signal from the load cell [1]
Ref
Nominal weight of the load cell [1kg]
max
Nominal parameter of the load cell [1mV/V]
n
Scale factor (can be activated via bit R32.8 [}47] of the feature register)
S
Offset of the manufacturer scaling (can be activated via bit R32.1 [}47] of
H
[1]
[1]
R2 [}44]
R3 [}45]
R35 [}48]
R36 [}48]
R38 [}49]
R19 [}46]
the feature register)
A
Gain of the manufacturer scaling (can be activated via bit R32.1 [}47] of the
H
[1]
R20 [}46]
feature register)
B
Offset of the user's scaling (can be activated via bit R32.0 [}47] of the
A
[1]
R33 [}47]
feature register)
A
Gain of the user's scaling (can be activated via bit R32.0 [}47] of the
A
[1]
R34 [}48]
feature register)
The factor of 1000 in formula 1.0 [}11] results from normalizing the units of the nominal weight [kg] and the nominal parameter [mV/V]. The factor 1/500 is specified through a voltage divider. The result is written into the terminal's process image with a resolution of 16bits (+ sign). This value is saved as a data word, without
sign, in register R1 [}44]. The sign is represented in bit SB1.0 [}38] of the status byte.
Operation modes
The KL3356 provides different operation modes:
KL3356 and KS3356 11Version: 2.4.0
Product overview
Operation mode Comment
Normal operation Measuring the force acting on the load cell
Zero calibration The DC voltage potential at the inputs to the operational amplifier corresponds to that of
normal operation. The differential voltage at the two operational amplifier inputs is 0mV (determination of the zero points).
Final calibration The DC voltage potential at the inputs to the operational amplifier corresponds to that of
normal operation. The divided cell supply voltage (R114, R115, R151) is applied as a differential signal to both the operational amplifier inputs (determination of the amplification factors).
Null-test (0V) The DC voltage potential at the operational amplifier inputs is set to 0V. The differential
voltage at the two operational amplifier inputs is 0mV (first stage in establishing the Common Mode Rejection of the operational amplifiers).
Null-test (2.5V) The DC voltage potential at the operational amplifier inputs is set to 2.5V. The
differential voltage at the two operational amplifier inputs is 0mV (second stage in establishing the Common Mode Rejection of the operational amplifiers).
Reference test The DC voltage potential at the inputs to the operational amplifier corresponds to that of
half the reference voltage. The divided reference voltage (R114, R115, R151) is applied as a differential signal to the two operational amplifier inputs (measurement of the reference voltage).
Switch settings
The various operation modes are selected by means of internal switches:
• Switch SW1 is switched by bit R32.7 [}47] of the feature register, and is to be closed for all calibration
processes:
- R32.7 = 0: SW1 open
- R32.7 = 1: SW1 closed
• If manual calibration mode is enabled in the command register R7 [}45] you can control switches SW2 to SW8 by means of the output data word RegOUT [}36].
Operation mode RegOUT Switch settings
SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8
Normal operation 0
Zero calibration 1
Final calibration 2
Null-test (0V) 3
Null-test (2.5V) 4
Reference test 5
dec
dec
dec
dec
dec
dec
0/1 1 1 0 1 0 1 0
0/1 0 1 1 0 0 0 0
0/1 0 0 1 1 0 1 0
0/1 0 0 1 0 0 0 1
0/1 0 0 1 0 1 0 0
0/1 0 0 1 0 1 0 1
Key
0: switch not connected 1: Switch connected
Calibrating the measuring amplifiers
The measuring amplifiers are periodically subjected to examination and calibration. For this purpose a total of eight analog switches are provided in order to be able to connect the various calibration signals. It is important for this process that the entire signal path, including all passive components, is examined at every phase of the calibration. Only the interference suppression elements (L/C combination) and the analog switches themselves cannot be examined.
The calibration interval is set in register R40 [}49] in steps of 100ms. The test interval is specified in register R41 [}50] as a multiple of the calibration interval.
KL3356 and KS335612 Version: 2.4.0
Product overview
• In the first phase of the calibration, an input voltage of 0mV is applied to both analog inputs (zero calibration [}11]). The zero points of both analog input stages can be determined in this way. This
involves a system offset calibration of the A/D converter. In this measurement, both the respective absolute values and the mutual deviation of the channels are of interest.
• An input voltage of approx. 24mV is applied to both analog inputs in the second phase of the calibration (final calibration [}11]). This is derived from the power supply to the load cell. At this point
the absolute value of the measurements is no longer an interest, only any possible deviation of the values for the two analog inputs. The gain of the first channel is adjusted here to match that of the second channel. The important point is that the calibrations are carried out using the same DC voltage potential at the inputs to the operational amplifiers, as in a normal measuring operation.
Calibrating the input stages at both working points (the zero point and the final value) allows the straight lines of the two measuring channels to be adjusted to one another so that they are congruent.
Fig.2: Characteristic curves for calibration
If the terminal is carrying out a calibration, bit R0.2 [}44] is set in register 0 (the status word).
Testing the measuring amplifiers
In order to be able also to test the function of the analog input circuits and the source of the reference voltage, it is also possible, in addition to the calibration described, to connect the internal reference voltage signal of 2.5V as the input signal. For this purpose, before measuring the reference voltage itself, a difference voltage signal of 0V with a DC voltage potential of 0V is applied. Measurement of the 0V differential signal combined with a DC voltage potential of 2.5V is then carried out. With the aid of the measured values resulting from this, the CommonMode effect of the two input stages at an input voltage of
1.25V can be calculated, and can be taken into account in the subsequent measurement of the reference voltage. When measuring the source of the reference voltage, both operational amplifiers must deliver the same measuring signal, in addition to which it must also be possible to predict the value to within a very tight tolerance. If this tolerance is exceeded, the situation is classified as a hardware defect, and is indicated in bit
SW.8 [}44] of the status word. If the terminal is carrying out a test, bit R0.2 [}44] is set in register0 (the status word).
KL3356 and KS3356 13Version: 2.4.0
Product overview
Initiating the calibration or test
The calibration and test procedures are executed by the terminal automatically after the times specified in registers R39 to R41 [}49] have elapsed. Bit CB1.1 [}38] of the control byte can be used to block the automatic calibration (this command is acknowledged in bit SB1.1 [}38] of the status byte) in order to
prevent calibration from taking place during a time-critical measurement. So that calibration is not completely suppressed in this way, the KL3356 monitors the calibration cycle, and autonomously starts a forced calibration if the block remains in place for too long. The time after which the terminal will carry out this
forced calibration is specified in register R44 [}50] as a multiple of register R40 [}49]. At each measurement, the reference voltage is compared with the contents of register R45 [}50] (in units of 1mV). If it is found to be below this limit, bit R0.14 [}44] is set.
If it is necessary to initiate a test manually, it is started by bit CB1.0 [}38] of the control byte. Completion of a test is signaled by bit R0.4 [}44] in register R0 (the status word). The result of the last test is represented by a difference in the two analog inputs, and can be placed into registers R1 [}44] to R3 [}45] and R5 [}45] by bit CB1.2 [}38] of the control byte. Valid calibration data is present if bit R0.5 [}44] in register 0 (status word) is set to 1
. Register write protection can be set by bit CB1.3 [}38] to prevent the calibration
bin
data from being modified (this is acknowledged by bit SB1.3 [}38])
Manual operation
• Under some circumstances it may be necessary to observe the values from the A/D converter directly. For this purpose the terminal can be switched to manual operation. To do this, first enter the user code
word (1235
• Then enter the value 0401
) in the code word register R31 [}46] to clear write protection from the user register.
hex
into the command register (R7 [}45]) to switch to manual operation. If
hex
you enter the value 0 into register R7, manual operation is halted once more.
In manual operation, the value in the RegOUT [}36] output word returns the setting of the input switches (see table of Switch settings [}12]). You can use bit CB1.1 [}38] of the control byte to switch between OP1
and OP2 (CB1.1=0
: OP1; CB1.1 =1
bin
: OP2).
bin
A forced calibration is automatically carried out as soon as you return the terminal to normal operation again.
Error diagnosis
The KL3356 offers internal error diagnosis. The upper 8bits of register R0 [}44] (the status word) indicate errors that have occurred. So that the user does not have to keep reading register R0, any change in the error bits (if, for instance, a
new error has occurred or if an existing error has been cleared) is indicated in bit SB1.6 [}38] of status byte
1. All errors that have occurred are temporarily stored, and are not cleared by the terminal on its own account. By setting bit CB1.6 [}38] in control byte1 you can reset error bit SB1.6 [}38].
Measured value stabilization
During self-calibration, various signals are switched internally as described above. After the self-calibration has been completed, depending on the setting of R32.9 (stabilization of the calibration), the following behavior occurs:
- Stabilization active (R32.9 = 1): the terminal waits until the signal has stabilized as specified in register R47/ R48 and only then outputs measured values to the bus again - this extends the pause until the terminal measures again and can cause the terminal to wait until measurement in the event of an unstable input signal.
- Stabilization inactive (R32.9 = 0): the terminal immediately switches the measuring signal back to the bus ­this can lead to a swing-in process being observed in the measured value over several cycles.
KL3356 and KS335614 Version: 2.4.0

2.4 LEDs

Fig.3: LEDs
LED Display
Power (green)
K-bus (green)
Calibr. (green)
Measure (green)
Diff. (green)
Ref. (green)
Err. Diff. (red)
Err. Ref (red)
ON Power supply (5V) available on the K-bus
OFF No power supply (5V) available on the K-bus
ON Data transmission on the K-bus is active
OFF Data transmission on the K-bus is not active
ON Calibration active
OFF • Test active (if Measure LED not lit) or
ON Measurement active (process data are valid)
OFF • Calibration active (if LED Calibr. is lit) or
ON • Differential signal is calibrated (if Calibr. LED is lit) or
ON • Reference signal is calibrated (if Calibr. LED is lit) or
ON • Channel 1 (strain gauge differential signal) is above the valid range (max.
ON • Channel 2 (strain gauge reference signal) is above the valid range (max.
Product overview
• Measurement active (if Measure LED is lit)
• Test active (if Calibr. LED not lit)
• Differential signal is checked (if LED Calibr. not lit)
• Reference signal is checked (if LED Calibr. not lit)
0xFFFF)
• Internal reference voltage for channel 1 is missing
0xFFFF)
• Internal reference voltage for channel 2 is missing
• Channel2 is less than about 1 V
• No communication with the A/D converter.
• Actual value from the test is outside the specified tolerance range
KL3356 and KS3356 15Version: 2.4.0
Mounting and wiring

3 Mounting and wiring

3.1 Installation on mounting rails

WARNING
Risk of electric shock and damage of device!
Bring the bus terminal system into a safe, powered down state before starting installation, disassembly or wiring of the bus terminals!
Assembly
Fig.4: Attaching on mounting rail
The bus coupler and bus terminals are attached to commercially available 35mm mounting rails (DIN rails according to EN60715) by applying slight pressure:
1. First attach the fieldbus coupler to the mounting rail.
2. The bus terminals are now attached on the right-hand side of the fieldbus coupler. Join the compo­nents with tongue and groove and push the terminals against the mounting rail, until the lock clicks onto the mounting rail. If the terminals are clipped onto the mounting rail first and then pushed together without tongue and groove, the connection will not be operational! When correctly assembled, no significant gap should be visible between the housings.
Fixing of mounting rails
The locking mechanism of the terminals and couplers extends to the profile of the mounting rail. At the installation, the locking mechanism of the components must not come into conflict with the fixing bolts of the mounting rail. To mount the mounting rails with a height of 7.5mm under the terminals and couplers, you should use flat mounting connections (e.g. countersunk screws or blind rivets).
KL3356 and KS335616 Version: 2.4.0
Mounting and wiring
Disassembly
Fig.5: Disassembling of terminal
Each terminal is secured by a lock on the mounting rail, which must be released for disassembly:
1. Pull the terminal by its orange-colored lugs approximately 1cm away from the mounting rail. In doing so for this terminal the mounting rail lock is released automatically and you can pull the terminal out of the bus terminal block easily without excessive force.
2. Grasp the released terminal with thumb and index finger simultaneous at the upper and lower grooved housing surfaces and pull the terminal out of the bus terminal block.
Connections within a bus terminal block
The electric connections between the Bus Coupler and the Bus Terminals are automatically realized by joining the components:
• The six spring contacts of the K-Bus/E-Bus deal with the transfer of the data and the supply of the Bus Terminal electronics.
• The power contacts deal with the supply for the field electronics and thus represent a supply rail within the bus terminal block. The power contacts are supplied via terminals on the Bus Coupler (up to 24V) or for higher voltages via power feed terminals.
Power Contacts
During the design of a bus terminal block, the pin assignment of the individual Bus Terminals must be taken account of, since some types (e.g. analog Bus Terminals or digital 4-channel Bus Termi­nals) do not or not fully loop through the power contacts. Power Feed Terminals (KL91xx, KL92xx or EL91xx, EL92xx) interrupt the power contacts and thus represent the start of a new supply rail.
PE power contact
The power contact labeled PE can be used as a protective earth. For safety reasons this contact mates first when plugging together, and can ground short-circuit currents of up to 125A.
KL3356 and KS3356 17Version: 2.4.0
Mounting and wiring
Fig.6: Power contact on left side
NOTE
Possible damage of the device
Note that, for reasons of electromagnetic compatibility, the PE contacts are capacitatively coupled to the mounting rail. This may lead to incorrect results during insulation testing or to damage on the terminal (e.g. disruptive discharge to the PE line during insulation testing of a consumer with a nominal voltage of 230V). For insulation testing, disconnect the PE supply line at the Bus Coupler or the Power Feed Terminal! In or­der to decouple further feed points for testing, these Power Feed Terminals can be released and pulled at least 10mm from the group of terminals.
WARNING
Risk of electric shock!
The PE power contact must not be used for other potentials!

3.2 Installation instructions for enhanced mechanical load capacity

WARNING
Risk of injury through electric shock and damage to the device!
Bring the Bus Terminal system into a safe, de-energized state before starting mounting, disassembly or wiring of the Bus Terminals!
Additional checks
The terminals have undergone the following additional tests:
Verification Explanation
Vibration 10 frequency runs in 3 axes
6 Hz < f < 60 Hz displacement 0.35 mm, constant amplitude
60.1Hz<f<500Hz acceleration 5g, constant amplitude
Shocks 1000 shocks in each direction, in 3 axes
25 g, 6 ms
KL3356 and KS335618 Version: 2.4.0
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