ABB IMASI13, Instructions Manual

Page: 116 / 128

Configuring Inputs
WBPEEUI240766B0 A - 5
System powered
4-20 mA This jumper configuration connects the plus (+) input terminal to 24
VDC through a fuse on the NTAI06. The minus (-) input terminal connects to a
precision resistor on the IMASI13 module that generates a single-ended volt-
age (0.4 to 2 V) to measure. The 250 ohm resistor in the NTAI06 TU is not
used. No connection to the C terminal is necessary. INFI 90 OPEN must have
+24 volts (system power) installed.
External powered
4-20 mA This jumper configuration connects the plus (+) input terminal to one end of a
precision resistor and the minus (-) input to the other end of the same preci-
sion resistor located on the IMASI13 module. The 250 ohm resistor on the
NTAI06 TU is not used. An isolated 0.4 to 2 Volts is generated for the IMASI13
to measure. No connection to the C terminal is necessary.
3-wire resistance This jumper configuration connects the plus (+) and minus (-) inputs and the
COM input directly to IMASI13 three-wire input. Channel to channel and chan-
nel to system signal isolation is maintained. The two common leads of the
RTD element should be connected across the plus (+) and common (C) termi-
nals, and the third lead should be connected to the minus (-) terminal.
Table A-3. NTAI06 Input Type Descriptions
(continued)
Input Type Input Description