Installation On Mounting Rails - Beckhoff BC9000 Documentation

Fitting and wiring
3.1.2

Installation on mounting rails

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 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).
Disassembly
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.
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 Termi-
nals) 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.
14
WARNING
Version: 4.0.0 BC9000 and BC9100