Installation Guidelines
3.3 Electrical Connections
LDS 6
Operating Instructions, 01/2009, A5E00295894-05
33
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Figure 3-2
Spark suppression on a relay contact
The preceding figure shows an example of measure to suppress sparks on a relay contact.
Since the DSUB connector and the spacings on board and on connector are only suitable for
detachable voltages (signal) and as the power is located outside this powers supply, circuit
must be SELV and the power must be limited according to EN61010-1 (Table 13 or 14)
when an over current protective device is used.
● The reference ground of the analog inputs is the housing potential.
● The analog outputs are floating, also with respect to one another.
● The interface cable must be screened and connected to housing potential. The cable
screen must be connected with a large-area contact to the screen of the DSUB plug. The
conductor cross-section should be at least 0.5 mm
2
. The interface cable must not be
longer than 500 meters (1,640 ft).
● In the case of analyzers with two or three channels, the analyzer sections are connected
in parallel and the signal cables of each channel are independent. Only the power plug is
common to all channels.