O P E R AT I N G I N S T R U C T I O N S |
Bulkscan LMS511
8014829/ZNC5/2017-06-06|
S I C K
Subject to change without notice
4 5
ELECTRICAL INSTALLATION
6.3.6.2
Installation of Bus Terminals on mounting rails
Bring the bus terminal system into a safe, powered down state
before starting installation, disassembly or wiring of the Bus Terminals!
Assembly
The Bus Coupler and Bus Terminals are attached to commercially available 35 mm
mounting rails (DIN rails according to EN 50022) by applying slight pressure:
During the installation of the Bus Terminals, the locking mechanism of the terminals
must not come into conflict with the fixing bolts of the mounting rail.
Disassembly
Each terminal is secured by a lock on the mounting rail, which must be released for
disassembly:
• Carefully pull the orange-colored lug approximately 1 cm out of the disassembled
terminal, until it protrudes loosely. The lock with the mounting rail is now released for
this terminal, and the terminal can be pulled from the mounting rail without exces-
sive force.
•
Grasp the released terminal with thumb and index finger simultaneous at the upper
and lower grooved housing surfaces and pull the terminal away from the mounting
rail.
Connections within a bus terminal block
The electric connections between the Bus Coupler and the Bus Terminals are automati-
cally 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 termi-
nals on the Bus Coupler.
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.
Note that, for reasons of electromagnetic compatibility, the PE contacts are capacita-
tively 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.
The PE power contact must not be used for other potentials!
Wiring
Up to eight connections enable the connection of solid or finely stranded cables to the
Bus Terminals. The terminals are implemented in spring force technology. Connect the
cables as follows:
• Open a spring-loaded terminal by slightly pushing with a screwdriver or a rod into the
square opening above the terminal.
• The wire can now be inserted into the round terminal opening without any force.
• The terminal closes automatically when the pressure is released, holding the wire
securely and permanently.
