Bosch FW5.50 Manual de usuario descargar pdf (Pagina 2)

Creating Potential Groups

Both bus refreshing modules and power feeding modules may be used to create a potential group. The base module

creates the possible isolation of the potential group on the left-hand side of the respective power distribution module.

It is not permitted for modules with 24 VDC and with 120/230 VAC field supply to be used in a joint potential group.

Therefore, when using digital input modules for 120/230 VAC, the power feeding module BL20-PF-120/230VAC-D is to be

used to create a special potential group.

C-rail (Cross Connection)

C-rails run through all I/O base modules. The C-rail for base modules for power distribution is mechanically separated; thus

potentially isolating the adjoining supply groups.

Access to the C-rail

Access to the C-rail is made via base modules with a C designation (i.e. BL20-S4T-SBCS). The corresponding connection

level is indicated by a thick black line on all base modules for BL20 I/O modules. For base modules for power distribution,

the black line is only above the connection “24" to indicate that the C-rail is separated from the adjoining potential group to

its left.

It is permitted to load the C-rail with a maximum of 24 V; never with 120/230 VAC.

Using the C-rail with Relay Modules

The C-rail may be used to supply a common voltage when relay modules are used. To accomplish this, the load voltage (24

VDC) is connected to a power distribution module and the base module BL20-P4x-SBBC with either tension clamp or screw

connections.

If the C-rail is used for the joint supply of voltage to relay modules, there must be a power distribution module used for the

potential isolation of the BL20 modules. The C-rail may still be used as protective earth (PE) once the potential isolation has

been made.

Using the C-rail as a Protective Earth

A C-rail may be used as a protective earth (PE), where the PE connection for each power distribution modules must be

connected to the mounting rail via an additional PE terminal, which is available as an accessory.

Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]

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Bosch FW5.50 Manual de usuario Pagina 2