ABB IMASI13, Instructions Manual

Page: 86 / 128

Field Calibration
WBPEEUI240766B0 4 - 5
•
S4 sets the input type (zero equals millivolt).
•
S5 sets the amount of gain. Set S5 to the gain value.
•
S6 sets the offset value. Set S6 to the offset value.
Check block N+2 or block N+3 to see if the set user gain and
offset command is processed correctly, and is incorporated
into ASI module input reading of that channel and type.
NOTE: Field calibrating all 16 channels for all four input types on an IMASI13
module is a lengthy procedure that may require up to four hours to complete
when done properly.
A channel can be disabled and field calibrated separately from
the rest of the active channels on the ASI module. Each chan-
nel can be calibrated for any of the three input ranges:
•
Individual channel low level voltage range (-100 to
+100 millivolt).
•
Individual channel high level voltage range (-10 V to +10
V).
•
Individual channel three-wire resistance range (5 ohms to
500 ohms).
To field calibrate each of the four ranges:
1. Configure the point in the system.
2. Disable the point from the system.
3. Calibrate the point with the new value (two calibration
points per channel and input type).
4. Enable the point to the system.
Before beginning calibration, each channel must be configured
with one FC 216, and the calibration type defined in S4 of FC
217 must be consistent with the input signal defined in S4 of
FC 216.
The input channel being field calibrated must be disabled
before any calibration commands are accepted. Disabling the
input channel removes the channel from the normal input
scan processing. The point shows bad quality while it is dis-
abled. The value of the input is undefined while the channel is