YSI IQ SensorNet 2020 XT Terminal - Manual (Page 39)

System 2020 XT USB Installation
3 - 9 ba76019e01 12/2012
Example Problem:
Consumers with a total power requirement of 9 W are positioned on a
cable section of 650 m. Is the power supply with one power supply
module sufficient? At which point must a further power supply module
be installed if necessary?
Proceeding:
 Enter both values as a point in the diagram (point "x" in Fig. 3-3).
 Result: the point is in the invalid range. I. e. the power supply is not
sufficient.
 Draw down a vertical line from the point until the line crosses the limit
between the upper and lower range. The intersecting point specifies
the maximum cable length for the existing power requirement (at
approx. 470 m). This is the place where the additional power supply
module is required.
 If any main consumers are near the place, the power supply module
should be installed in their vicinity (ideally, directly on them).
Note
After commissioning, you can check the voltage directly on the
MIQ modules or on the terminal connections of the IQ sensors (see
section 7.2.2). The limits of the voltage levels are given in section
7.2.2 M
EASURING THE VOLTAGE of this operating manual.
Quality of data
transmission
If the sum of all line lengths (including the SACIQ sensor connection
cable) exceeds 1000 m, an MIQ/JBR signal amplifier module must be
installed in the system. More details of this are given in the MIQ/JBR
component operating manual.