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7. Connecting the transducers
The analog inputs are electrically isolated from one another by means photo-
voltaic relays. A new feature on this device is the additional separation of the
measuring inputs from CPU and power supply. Between all inputs and outputs
(even the analog output cables which are not electrically isolated) the maxi-
mum potential difference permitted is 50 V. The voltage at the measuring in-
puts themselves must not exceed 12 V (between B, C, D, and A).
However, some components are not electrically isolated, namely all sensors
connected to the same common internal power supply ±U or combined sen-
sors within one connector. For these sensors the electrical isolation may have
to be disabled by means of relay S (see above) or by wire jumper; some inputs
would otherwise be left without reference potential. The relay is set automati-
cally by element flag 5 ´ISO OFF´ the first time it is connected; (see Manual
6.10.3). However, with certain connectors (especially divider connectors with-
out power supply) element flag 5 should be checked and if necessary correct-
ed. These sensors must themselves be isolated or the device must be operat-
ed with an electrically isolated power supply (mains adapter or connecting ca-
ble ZA2690-UK with DC/DC converter).
Data and trigger cables are also isolated by means of optocouplers.
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