CARLO GAVAZZI UWP 3.0, Руководство пользователя, Страница: 40 / 45

How to install an UWP 3.0 system
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1.9.2 How to wire the power supply
The DIN-rail modules powered by to 24 Vdc nominal (15-30 Vdc) come with in/out connections to speed
up wiring: there are two A1(+) terminals that are internally short circuited, and two A2(-) terminals that are
also short circuited.
The best wiring should be carried out as shown below. The immunity to EMC can be improved by
connecting the negative terminal of the DC power supply of the system (-) to the earth ground.
All the DIN-rail modules with the in/out terminals come with two short wires already screwed into the A1
and A2 terminals in order to speed up commissioning.
Recommendations:
1) Use a battery back-up system to avoid switching off the installation if a power down should occur.
2) Be careful to have a total current not greater than 3A on the power supply if using the in/out
terminals, since the maximum current that the internal connections can withstand is 3A.
If Dc motors are used to control roller blinds or windows, do not supply them from the same wires
used in the in/out connections since the maximum current they can withstand is 3A (see below:
in this case the sizing of the power supply must take into consideration also the consumption of
the motor).
3) It is recommended that the system is supplied @24Vdc in order to reduce the current and thus
the stress on the internal electronic components. This will result in a longer lifetime of the
modules.