HIMA I/O Module H4116 System Components

Description

H4116 Please regard the requirements of the SELV EN 60950 or PELV EN

60904.To improve the electromagnetic compatibility an instrument earth is

provided. The instrument earth is designed within the cabinat in such a

way that it fulfils the requirements of a protection earth.

All H41q/H51q systems can be H4116 operated with earthed L- or not earthed.

With several undetected earth faults faulty control signals may be re

leased. H4116 To prevent this, with floating operation in any case an earth fault

monitoring system must be provided (ref. also to VDE 0116).

An earth fault can only be located by switching off a partial function (sepa

ration of lines). If both poles are feed to supply an output circuit an earth

fault can be detected.

H4116 It is prerequisite that the earthing conditions be excellent and there is a se

parate earth connection (if possible) through which no external currents

flow. Only the earthing of the L- negative pole is permitted. Earthing of the

L+ positive pole is not permissible, H4116 as any earth fault on the sensor line

would result to an overriding of the sensor concerned.

L- may only be earthed at one point within the system. Generally L- is

earthed directly behind the power supply (e. g. on the bus bar). The eart

hing should be easy to access and disconnect. The earthing resistance

must be ≤ 2 Ohm

H4116 According to the guidline 89/336/EWG of the European Council (also law

for EMC in the Federal Republic of Germany), since January, 1st 1996 all

electrical equipments have to be provide with the CE symbol in relation of

Electromagnetic Compatibility (EMC) within the European Union.

All modules of the HIMA system families H41q/H51q are supplied with the

CE symbol.

To prevent also EMC problems with the installation of controls (PLCs) in

cabinets and frames, the following measures are required:

– Installation of the H 7013 HIMA module as power supply filtre directly

on the 24 V DC feeding. The filtre is not required if power supplies with

the CE symbol are used e. g. the HIMA standard power supplies

600S24 and 1200S24.

– Correct and interference-free electrical H4116 installation in the ambient of

the control, e. g. no power current cables should run together with the

24 V cables.

– If the 24 V feeding is installed in an own power supply cabinet separa

ted from the cabinets with PLCs, no filtre H 7013 is neccessary if the

all the cabinets are installed near by the others.

– Furthermore please notice the hints within the main catalogue con

cerning earthing, screening and cable run to sensors and actors.

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