En
gl
is
h (
G
B)
6
4. Electrical connection
The electrical connection must be carried out in
accordance with local regulations and special local
Ex regulations, if any.
4.1 Electrical data
The LC-Ex4 unit has two cables which must be
connected to the LC 108 or LCD 108 controller
inputs for float switches.
The float switches must be connected to the inputs
of the LC-Ex4, see the wiring diagram in fig. B,
page 16.
When connecting the float switches, note whether
the float switch should close or open the contact to
start the pump.
See also section "Electrical connection" in the
installation and operating instructions for the LC 108
or LCD 108 controller.
See also the mounting sketch in fig. A, page 15, and
the wiring diagram in fig. C, page 17.
4.2 Installation
Intrinsically safe wiring must be installed in
accordance with the requirements of EN 60079-14
(Explosive atmospheres - Part 14: Electrical
installations design, selection and erection).
Place the LC-Ex4 in vertical position. See fig. A,
page 15.
Make sure that the cable diameter and cable gland
match.
The cable glands of the earth cable: Pg 7, cable
diameter of
∅
3 to
∅
6.5.
The cable glands of the float switches: Pg 9, cable
diameter of
∅
4 to
∅
8.
5. Maintenance
Under normal operating conditions, the unit is
maintenance-free, see section
.
5.1 Replacement of parts
The Zener barrier unit or the box including the Zener
barrier unit can be replaced.
5.2 Product numbers
Warning
Install the unit outside the potentially
explosive area.
Warning
As the LC-Ex4 and FB-Ex4 have a
safety barrier without galvanic
separation, an earth connection is
necessary for safety reasons.
Um
250 V
Po
0.4 W
Uo
16.9 V
Io
94 mA
Co
305 nF
Lo
1 mH
Max. Lo/Ro ratio
71
μ
H/Ohm
Caution
The unit must not be exposed to direct
sunlight.
Note
The cable sheath must be intact all way
through the cable gland and minimum
20 mm inside the box.
Do not strip more conductor insulation
and cable sheath than required to fit
the terminals inside the box.
Warning
Make sure that no work is carried out in
potentially explosive environment.
Warning
Before starting work on the product,
switch off the power supply. Make sure
that the power supply cannot be
accidentally switched on.
Note
The Zener barrier unit must not be
repaired.
Unit
Product number
FB-Ex4, Zener barrier unit
96538241
LC-Ex4, box including the
Zener barrier unit
96440300
