Publication 1769-UM005A-EN-P
3-10
Installation and Wiring
When using a 3-wire configuration, the module compensates for
resistance error due to lead wire length. For example, in a 3-wire
configuration, the module reads the resistance due to the length of one of
the wires and assumes that the resistance of the other wire is equal. If the
resistances of the individual lead wires are much different, an error may
exist. The closer the resistance values are to each other, the greater the
amount of error that is eliminated.
To insure that the lead values match as closely as possible:
•
Keep lead resistance as small as possible and less than 25
Ω .
•
Use quality cable that has a small tolerance impedance rating.
•
Use a heavy-gauge lead wire which has less resistance per foot.
Terminal Door Label
A removable, write-on label is provided with the module. Remove the
label from the door, mark your unique identification of each terminal with
permanent ink, and slide the label back into the door. Your markings (ID
tag) will be visible when the module door is closed.
Removing and Replacing the Terminal Block
When wiring the module, you do not have to remove the terminal block.
If you remove the terminal block, use the write-on label located on the
side of the terminal block to identify the module location and type.
To remove the terminal block, loosen the upper and lower retaining
screws. The terminal block will back away from the module as you
remove the screws. When replacing the terminal block, torque the
retaining screws to 0.46 Nm (4.1 in-lbs).
IMPORTANT
To ensure temperature or resistance value accuracy, the
resistance difference of the cable lead wires must be
equal to or less than 0.01
Ω .
SLOT # _____
MODULE TYPE ______
Содержание Compact 1769-IR6
Страница 1: ...Compact I O RTD resistance Input Module Catalog Number 1769 IR6 User Manual AB PLCs ...
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Страница 40: ...Publication 1769 UM005A EN P 3 16 Installation and Wiring ...
Страница 74: ...Publication 1769 UM005A EN P 4 34 Module Data Status and Channel Configuration ...
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Страница 116: ...Publication 1769 UM005A EN P February 2001 2001 Rockwell International Corporation Printed in the U S A ...