F 6221 (0625)
321
• Modules, which were operated in general electrical systems, may not be used thereaf-
ter no more in Ex-plants.
The lines used must comply with the following insulation test voltages:
• Intrinsically safe lines
≥ 1000 VAC
• Not intrinsically safe lines
≥ 1500 VAC
Stranded wires, the line ends must be provided with wire end ferrules.
The terminals must be suitable for clamping the wire cross section.
The applicable regulations and standards have to be complied with, especially:
• DIN EN 60079-14: 1997 (VDE 0165, Part 1: 1998)
• EN 50 014: 1999 (VDE 0170/0171 Part 1: 2000)
• EN 50 020: 1994 (VDE 0170/0171 Part 7: 1996)
4.4 Connection of unused inputs
Any voltage inputs 0...1 V which are not used have to be short-circuited at the terminal strip.
Unused current inputs are terminated with the shunt in the cable plug.
Inputs, which are not terminated, are not reported as "faulty" (e.g. un-plugged cable).
4.5 Requirements for the supply
The internal resistance of supply must not exceed 500 Ω. Otherwise internal errors of the mod-
ule can not be detected.
4.6 Redundant connection
When the inputs are connected redundantly, an error at one input may generate a measuring
error at the redundant faultless input. The measuring error can be up to 2.5% when the input
is terminated with a 50
Ω resistor.
Due to the voltage drop on the line connecting the redundant modules, the cable length is lim-
ited to 2 m.
4.7 External transmitter connection (variants D,E)
The line between the F 6221 module and the assigned measuring shunts (channels 1 to 8) can
have a maximum length of 10 m.
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