14
5 Connecting to power supply
WIKA Operating Instructions - Process pressure transmitter IPT-1*
is grounded on both ends. To avoid this, the cable screen must be
connected to ground potential only on one end (inside the switch-
ing cabinet) in such applications. The cable screen must
not
be
connected to the internal ground terminal in the sensor and the outer
ground terminal on the housing
not
to potential equalisation!
Information:
The metallic parts of the instrument such as transmitter and process
fitting are conductively connected with the inner and outer ground
terminal on the housing. This connection exists either as a direct me-
tallic contact or via the shielding of the special connection cable on
instruments with external electronics. You can find specifications on
the potential connections within the instrument in chapter "
Technical
data
".
Take note of the corresponding installation regulations for Ex applica-
tions. In particular, make sure that no potential equalisation currents
flow over the cable screen. In case of grounding on both sides this
can be achieved by the use of a capacitor or a separate potential
equalisation.
5.2 Connection procedure
Proceed as follows:
1. Unscrew the housing cover
2. If a display and adjustment module is installed, remove it by turn-
ing it slightly to the left.
3. Loosen compression nut of the cable entry gland
4. Remove approx. 10 cm (4 in) of the cable mantle, strip approx.
1 cm (0.4 in) of insulation from the ends of the individual wires
5. Insert the cable into the sensor through the cable entry
6. Lift the opening levers of the terminals with a screwdriver (see
following illustration)
7. Insert the wire ends into the open terminals according to the wir-
ing plan
Select connection
cable for Ex applica-
tions
