ABB DSAI133 Adjusting the A/D converter

Description

32 channels, directly grounded inputs (single
ended), transducer supply fused channel by
channel, resolution 12 bits unipolar,
0 to + 10 V, 0 to + 5 V, 0 to + 20 mA,
4 to 20 mA (elevated zero obtained by SW)
shunt 250 Ω 0.05%
Adjustment for Boards DSAI 130, DSAI 133 and DSAX 110
The A/D converter is adjusted in three operations:
• Adjustment of zero point Z (automatically adjusted on DSAI 133)
• Adjustment of full scale value G
• Adjustment of symmetry S (only DSAI 130, normally unnecessary).
The adjustments are performed in the same order as given here (zero point, full scale value and
symmetry, if relevant).

Adjust AI units which are intended for voltage or current signals with the help of a voltage
reference. If all inputs are jumpered for current, and none are unused so that the solder jumper
can be clipped, you can use a voltage reference which can give at least 20.5 mA for a channel
jumpered for a current shunt.
In this case, set CONV_PAR on the data base element to -20..20 mA, 0..20 mA or
-5..5 V, and half the reference voltage is used instead of the values specified below as an internal
gain multiplied by 2 is used.
An input and corresponding data base element are selected for the adjustment. If an unused
input is selected, ensure that ACT is set to 1 and afterward reset to 0. Select a signal with
CONV_PAR=-10..10 V (exception in accordance with the above) or change CONV_PAR in the
data base element concerned.
Make the updating continuous by setting DEADB=-1 and FILTER_P=0 (note previous values
so that they can be reset after the adjustment).
The reference voltage for the adjustment is connected to the connection unit and the measured
value is read with an engineering station.
The potentiometers Z,G and S are located in the lower half of the front of the board.

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