Vaisala Humicap HMT330 Serie Schnellreferenzhandbuch Seite 5

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Wiring
- A single electrical cable with a screen and three to ten wires is recommended for power
and analog/serial connections. The cable diameter should be 8...11 mm. The number of
cable bushings depends on the transmitter options. Ground the screen of the electrical
cable properly to achieve the best possible EMC performance.
Figure 4 Grounding the Screen of
Electrical Cable
WARNING
WARNING
CAUTION
VAISALA ________________________________________________________________________ 5
0504-049
The AC (mains) power connection may be connected to the power
supply module only by an authorized electrician.
Make sure that you connect only unpowered wires.
In case you have only one AC supply, never connect same wire to the
+ connector of a transmitter and to the - connector of another one.
This will short-circuit the transformer.
a. Cut back outer sheath to desired
length.
b. Cut back screen braiding or screen
foil to dimension X (see figure 2).
c. Push the domed cap nut (item 1) and
the seal insert with contact socket of
the gland (item 2+3) onto the cable
as shown in the diagram.
d. Bend over the screen braiding or
screen foil by about 90º (item 4).
e. Push the seal insert with the contact
socket of the gland (item 2+3) up to
the screen braiding or screen foil.
f. Mount lower part (item 5) on the
housing.
g. Push the seal with the contact socket
of the gland and (item 2+3) flush into
the lower part (item 5).
h. Screw the domed cap nut (item 1)
onto the lower part (item 5).
When connecting to a 24 VAC power
supply a separate floating supply for each
transmitter is recommended.