Universal transmitter 8390-1
3. POWER SUPPLY
As power supply there are the following possibilities :
•
mains adapter 12 V / 200 mA
ZB 1012-NA1
•
DC voltage supply, 7 to 13 V DC
•
DC voltage supply, 9 to 30 V DC, electrically isolated OA 8390-U
3.1 Power supply via the mains adapter
On the rear of the device there is the socket (5) for connecting an external power sup-
ply. Here by default mains adapter ZB 1012-NA1 (12 V / 200 mA) is connected to the
+ and - terminals by means of the clamp connector. Or, alternatively, you can use
some other DC power source (7 to 13 V).
If, however, the power supply has to be
electrically isolated
from the transducers,
then option U is required.
3.2 DC voltage supply (option U)
Option U (OA 8390-U) provides an electrically isolated DC voltage supply with a wide
input voltage range, 9 to 30 V. The voltage must also be connected to the clamp /
screw terminal of socket (5) on the device using the clamp connector. It will then be
possible to use the measuring instrument in a 12-volt or 24-volt on-board supply sys-
tem.
3.3 Sensor supply
Whatever the power supply, a sensor supply voltage of approx. 12 V DC (maximum 70
mA) is available on the + and - terminals of the ALMEMO
®
connector. With special
connectors, 15 V or 24 V DC or reference voltages of 5 V and 2.5 V are also available.
3.4 Data saving, reinitialization
Sensor programming is saved in the connector itself; calibration and process flow con-
trol data is saved in an EEPROM in the device; in the event of an interruption to the
power supply this data is retained intact; only the date and time-of-day are lost and as
and when power is restored these are reset (to 01.01.00 00:00:00).
If you wish to reset the device parameters to their default values, in particular the baud
rate to 9600 bauds, then, when switching on, set the code switches for the address
just once to 99. The address must then of course be reset again.
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