19
5 Connecting to power supply
VEGAPULS 21 • Two-wire 4 … 20 mA/HART
58351-EN-191014
You have to remove this plug before electrical connection.
NPT thread
In the case of instrument housings with self-sealing NPT threads, it
is not possible to have the cable entry screwed in at the factory. The
free opening for the cable gland is therefore covered with a red dust
protection cap as transport protection.
Note:
Prior to setup you have to replace this protective cap with an ap-
proved NPT cable gland or close the opening with a suitable blind
plug.
Note:
Do not use grease when screwing in the NPT cable gland or a conduit
steel pipe.
Maximum torque see chapter "
Technical data
".
If shielded cable is required, we recommend that the cable screening
be connected to ground potential on one side of the supply side.
In Ex systems, the grounding is carried out according to the installa-
tion regulations.
5.2 Connecting
The voltage supply and signal output are connected via the spring-
loaded terminals in the housing.
Note:
Fixed conductors and flexible conductors with ferrules can be insert
-
ed directly into the terminal openings. In the case of flexible conduc
-
tors for opening the terminals, use a screwdriver (3 mm blade width)
to push the actuator lever away from the terminal opening (snaps
into place). To unlock, press the actuator lever slightly from behind to
close the terminals again.
Cable screening and
grounding
Connection technology
