Table of Contents
Advertisement
Operation principle and hardware description 27
Hardware of the supply modules
The D8T modules run on wheels, and can easily be removed from the cubicle for cable
installation or service. For moving the D7T modules you need a lifting device. The quick
connector for the AC supply input at the back of the D8T module couples when the module
is inserted into the cubicle.
The control electronics of the supply module need to be powered from an external
auxiliary voltage source. The speed-controlled cooling fan (delivered as standard) is
supplied internally from DC. If a direct-on-line fan (option +C188) is used, the user must
connect the fan supply to the module control connector [X50.1].
The supply modules are controlled by a single BCU control unit installed separately from
the module(s). The control unit is connected to each supply module by a fiber optic link.
The control unit can be powered from a module connector [X53], from an external 24 V DC
supply, or both for redundancy. The control unit contains the basic I/Os and slots for
optional I/O modules. For descriptions of the I/O terminals on the BCU control unit, see
chapter
Control unit
on page 231.
Advertisement
Table of Contents
