Mounting and wiring
BK7150
14
Version: 1.0.0
The right hand part of the Bus Coupler can be compared to a Bus Terminal. Eight connections at the top
enable the connection with solid or fine wires from 0.08 mm² to 2.5 mm². The connection is implemented with
the aid of a spring device. The spring-loaded terminal is opened with a screwdriver or rod, by exerting gentle
pressure in the opening above the terminal. The wire can be inserted into the terminal without any force. The
terminal closes automatically when the pressure is released, holding the wire safely and permanently.
3.1.3
Installation on mounting rails
WARNING
Risk of injury through electric shock and damage to the device!
Bring the Bus Terminals system into a safe, de-energized state before starting mounting,
disassembly or wiring of the Bus Terminals.
Mounting
The Bus Couplers and Bus Terminals are attached to commercially available 35 mm mounting rails (DIN rail
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 compo-
nents with slot and key 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 slot and key,
the connection will not be operational! When correctly assembled, no significant gap should be visible
between the housings.
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.
Removal
Each terminal is secured by a lock on the mounting rail, which must be released for disassembly:
1. Carefully pull the orange-colored lug approximately 1 cm out of the terminal to be disassembled, 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 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 away from the mounting rail.
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.
Note
Power contacts
During the design of a Bus Terminal block, the pin assignment of the individual Bus Termi-
nals 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 and EL91xx, EL92xx) interrupt the power contacts and thus
represent the start of a new supply rail.
PE power contact
The power contact labelled 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.