Azbil JTD720A, Руководство пользователя, Страница: 30 / 76

Installation Azbil Corporation
2-12 Model JTD720A - Smart Multivariable Transmitter
Conduit pipe
Lead cables into the transmitter case as follows;
Install a conduit pipe in the electrical conduit (G1/2 female thread) provided on the
side of a transmitter, and lead cable through the pipe.
Seal the part that contacts with the conduit pipe using a sealing agent or a seal plug to
positively prevent entry of water.
Install transmitter so that the cables lead into it, from the bottom.
If required, use a special elbow to change cabling direction.
Connect RTD (PT100 or JPT100) wires as shown in the figure using sealed cable. If
temperature compensation is not required, this RTD is not necessary.
~Note
1. If temperature compensation is used and the terminal is open, the
device will be diagnosed with a critical failure in self-diagnosis.
2. It may take 5 minutes or more for stable input after connecting RTD to
the transmitter.
3. The maximum cable length between the transmitter and the RTD is 20 m.
Grounding
Two ground terminals are provided. One terminal is on the terminal, and the other is
outside the transmitter. Ground either one.
Connect a ground terminal with a ground resistance not higher than 100
W
.
Grounding is essential when installing explosion-proof transmitter.
Directly ground welding machine and transformer, for its power supply. Never
connect such equipment by ground terminal to the stanchion pipe that holds a
transmitter. Welding current may influence measurements.
Supply power
Confirm the relationship between the external load resistance and the supply voltage.
As shown in the illustration, the relationship should be inside the shaded area.