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4.1
W
IRING
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2-wire indicators are used in 4–20 mA current loops. They do not require external power supply.
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3-wire devices are powered with 10 V…36 V DC (Ex type devices: 10 V...30 V DC) through the output.
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Make sure, that current values on the internal terminals should not exceed overload capability limits.
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Wiring should be done with shielded cable, specified under ‘Technical Data’ table.
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Devices should be grounded by using their grounding screws.
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The screw terminals can be accessed after removal of the housing cover and the display module.
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After wiring and programming the cover should be screwed to tightness of the sealing.
!
The types with stainless steel housing are not allowed to be set up and installed until,
the „Ex d” certified cable gland is not fixed to the place of the red plastic closing cap with proper sealing!
The metal plug may only be removed if 2 cable glands are used.
!
The housing cover of the flameproof device is allowed to remove only when the unit is de-energized!
The housing cover can be removed after unscrew the M2 size hex socket set screw
or after dismounting the safety locking bolt by unscrew the M4 size hex socket set screws.
!
The instrument may be damaged by electrostatic discharge (ESD) via its terminal, thus apply the precautions commonly used to avoid
electrostatic discharge e.g. by touching a properly grounded point before removing the cover of the enclosure.
A possible electrostatic discharge can cause damage for the instrument. Do not touch the internal terminals!
!
After wiring and programming the housing cover should be closed properly and the hex socket set screw or the safety locking bolt should be
tightened! The sealing ring must be replaced if damaged, otherwise the IP class of the device can be jeopardized.
4-20mA
4-20mA
PDF- 401-6/A/C Ex
Us
6
1
Ex Ex
Figure 2. Wiring of a 2-wire Unicont in the current loop of a transmitter
R 250
≥ Ω
HART
Us
4-20mA
P F-401-8/B/D Ex
Ex Ex
6
1
Figure 3. Wiring of a HART capable (3-wire) Unicont
in the current loop of a transmitter
Shielding should be grounded at one point.
