Installation and Connections
31
8.2.5 Communication and Coprocessor Modules
Remove:
1. Disconnect the communication cable.
2. Important: At first remove the appertaining central module after removing the fixing screws,
3. remove communication module (Ethernet module with HSR cable connected, if existing)
after removing the fixing screws,
4. Ethernet module: Remove HSR cable.
Insert:
1. Check settings of the switches according to the data sheet,
2. insert module without cable and fix it,
3. Ethernet module: Connect HSR cable (only at HIPRO-S, but not at HIPRO-S-DIRECT),
4. connect communication cable,
5. insert appertaining central module and fix it by screws.
8.3 Earthing of the 24 VDC System Voltage
Please regard the requirement of the SELV (Safety Extra Low Voltage) or PELV (Protective
Extra Low Voltage). To improve the electromagnetic compatibility an instrument earth is pro-
vided. The instrument earth is designed within the cabinet in such a way that it fulfills the re-
quirements of a protection earth.
All H41q/H51q systems can be operated with earthed L- or not earthed.
8.3.1 Floating Supply
With several undetected earth faults faulty control signals may be triggered. To prevent this,
with floating operation in any case an earth fault monitoring system must be provided (ref. also
to e.g. VDE 0116). The earth fault monitoring must be installed outside the control cabinet.
An earth fault can only be located by switching off a partial function (separation of lines). An
earth fault can be detected if both poles are feed to supply an output circuit.
8.3.2 Earthed Operation
It is premised that the earthing conditions are excellent and there is a separate earth connec-
tion (if possible) through which no external currents flow. Only the earthing of the negative pole
(L-) is permitted. Earthing of the L+ positive pole is not admissible, as any earth fault on a sen-
sor line would result in 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 earthing should be easy to access and disconnect.
The earthing resistance must be
≤ 2 Ω.
8.4 Measures to Install a Cabinet According to the
CE Requirements
According to the guidline 89/336/EWG of the European Council (also law for EMC in the Fed-
eral Republic of Germany), since January 1st, 1996 all electrical equipments have to be pro-
vide with the CE symbol for 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 filter directly at the 24 VDC feed-
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