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4.3.1

Connection of the signal cables

NOTICE

Incorrect power supply

The 24 V/1 A power supply must be a power-limited safety extra-low voltage with safe electrical isolation (SELV).

Only connect the signal lines to devices which also have reliable electric isolation from their power supply.

● The connection lines to the relay outputs, binary inputs, and analog outputs must be shielded.

● The analog outputs are floating, but have a common negative pole.

● As a measure to suppress sparking across the relay contacts (e.g. limit relays), RC elements must be connected as

shown in the following figure. Note that the RC element results in a drop-out delay for an inductive component (e.g.

solenoid valve). The RC element should be sized according to the following rule of thumb:

–

R = R

/2; C = 4L/R

where R = 100 Ω and C = 200 nF are sufficient.

–

You must use a non-polarized capacitor for the RC element.

Figure 4-3

Measure to suppress sparks on a relay contact

When operated with direct current, a spark suppression diode can be installed instead of the RC element.

Refer to the ELAN interface description (Order No. C79000-B5200-C176 German, C79000-B5276-C176 English) for details

on the interface cable.

2 L

Compact Operating Instructions in accordance with EN 61010-1 and EN 60079-0

A5E45779389002-01, 09/2018