12
In the control cabinet: Electrically connecting the level controller
Supply voltage connection
The equipment is supplied with 24 V DC and has an external semi-delay 0.5 A fuse. Please use a safety
power supply unit with safe electrical isolation.
This power supply unit must be electrically isolated from dangerous live voltages and meet the require-
ments for double or reinforced insulation in accordance with one of the following standards:
DIN EN 50178, DIN EN 61010-1, DIN EN 60730-1 or DIN EN 60950.
Connecting the level electrode/level transmitter
For connecting the equipment, please use a screened, multi-core control cable with a minimum conduc-
tor size of 0.5 mm
2
, e.g. LiYCY 4 x 0.5 mm
2
, maximum length 100 m.
Max. 3 NRS/NRR 2-5.. switches/controllers can be connected to a level electrode or a level transmitter.
Wire the terminal strip as shown in the wiring diagram.
Fig. 3, 4
Connect the screen as shown in the wiring diagram.
Route the connecting cable between items of equipment separately from power lines.
Connection of output contacts
Wire the upper terminal strip
1
(terminals 16-23) according to the desired switching functions.
Provide an external slow-blow 2.5 A fuse for the output contacts.
When inductive loads are switched off, voltage spikes are produced that may have a major adverse
effect on the operation of control and measuring systems. Connected inductive loads must therefore
have interference suppression (RC combination) as per the manufacturer's specifications.
Tools
n
Screwdriver size 3.5 x 100 mm, fully insulated to VDE 0680-1.
Important
n
Do not use unused terminals as support point terminals.
Output of manipulated variable Y or connection of actual value output (optional)
For connection, please use a screened, multi-core control cable with a minimum conductor size of
0.5 mm
2
, e.g. LiYCY 2 x 0.5 mm
2
, maximum length 100 m.
Please note the load of max. 500 ohms (output of manipulated variable Y).
Wire the terminal strip as shown in the wiring diagram.
Fig. 3, 4
Connect the screen
once
only
to the central earthing point (CEP) in the control cabinet.
Route the connecting cable between items of equipment separately from power lines.
Any item of equipment that you wish to connect to the terminals for the output of manipulated variable Y
or actual value output 4-20 mA (optional) must be certified to have at least double or reinforced insula-
tion to DIN EN 50178 or DIN 61010-1 or DIN EN 60730-1 or DIN EN 60950 between the current loop and
live parts of the equipment that are not supplied with safety extra-low voltage (SELV).
continued
