BECKHOFF EL6930 - Manual (Page 19)

Operation
EL6930 17
4.1.3 Mechanical installation
DANGER
Serious risk of injury!
Bring the bus system into a safe, de-energized state before starting installation,
disassembly or wiring of the Bus Terminals!
4.1.3.1 Control cabinet
The TwinSAFE terminals must be installed in a control cabinet or terminal box with IP54 protection class
according to IEC 60529 as a minimum.
4.1.3.2 Installation position
For the prescribed installation position the mounting rail is installed horizontally and the mating surfaces
of the EL/KL terminals point toward the front (see illustration below). The terminals are ventilated from
below, which enables optimum cooling of the electronics through convection. "From below" is relative to
the acceleration of gravity.