Operating instructions

18
Compact Operating Instructions – DOP11C
4
Important installation notes
Installation
4 Installation
4.1 Important installation notes
4.1.1 Installation notes for the basic unit
Separate cable
ducts
Route power cables and electronic cables in separate cable ducts.
Cross-sections • Voltage supply: Cross section according to nominal input current.
• Electronics cables:
– 1 conductor per terminal 0.20 ... 0.75 mm
2
(AWG 20 ... 17)
– 2 conductors per terminal 0.20 ... 0.75 mm
2
(AWG 20 ... 17)
Shielding and
grounding
• Use only shielded signal cables.
• Connect the shield by the shortest possible route and make sure it is grounded
over a wide area at both ends. You can ground one end of the shield via an inter-
ference suppression capacitor (220 nF / 50 V) to avoid ground loops. If using double-
shielded cables, ground the outer shield on the controller end and the inner shield on
the other end.
Examples of correct shield connection with metal clamp (shield terminal) or metal Pg
cable gland.
• Shielding can also be achieved by routing the cables in grounded sheet metal
ducts or metal pipes. In this case, the power cables and control cables should
be routed separately.
• The unit is grounded via the connector for 24 V voltage supply.
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