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ndu
Q
®
- Series VMM
Electrical connection
Technical changes reserved
- 17 -
5
Electrical connection
CAUTION! Electric current!
The electrical connection of the VMM should only be carried out by a fully qualified elec-
trician.
De-energize the electrical system before connecting the VMM.
Make the electrical connection of the VMM through the terminal strips in the interior of the
display electronics.
For the separate design, the sensor cable for the electrodes and the magnetic current are
required in addition. They are connected through the terminal strips in the junction boxes of
the display electronics and the sensor.
Connecting cables:
When connecting the
VMM, use the following cable depending on the cable lengths:
Cable length Wire cross-section
Example
Cable ends dimension:
≤
32,8 ft (10 m)
≥
0.5 kcmil (0.25 mm2) LIYCY-CY TP 2x2x0.25 mm2
> 32,8 ft (10 m)
≥
1.5 kcmil (0.75 mm2)
LIY-TPC-Y 2x2x0.75 mm2
The cables are each twisted in pairs and shielded. In order to protect the cable from external
interference, the pair wires are covered by an additional, overall shield.
The outer shield is grounded by means of special EMC-compliant
cable glands at both ends of the cable.
IMPORTANT! Potential equalization required!
Comply with the instructions on Potential (
§ 4.2.1).
5.1
Mains and signal cable
The connection of the mains and signal cable are the same in both versions.
The terminal strips are located behind the rear hous-
ing cover.
Screw the rear cover from the housing counter
clockwise.
Only use signal cables as specified in chapter
"Connecting cables“.
Lay the signal cables separately from cables with
voltages >60 V.
Avoid laying signal cables close to large electrical installations.
IMPORTANT! Pay attention to the clamping area of the cable gland!
To guarantee the protection class as per DIN EN 60529, the connection cable being used
must have a sheathing diameter that matches the cable gland.
