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15
Operating manual ZX09/20/21-Series
5.
Electrical connection
5.1
General rules for the electrical connection
Please also note:
All electrical connections must be isolated from the mains either by safety transform-
ers (SELV/PELV) according to IEC 61558-2-6 with limitation of the output voltage in
the event of a fault or by equivalent isolation measures.
All outputs must have sufficient protective circuits for inductive loads. For this
purpose, the outputs must be protected with freewheeling diodes or varistors.
Do not lay the signal and communication lines of the digital inputs in the same cable
tray as AC supply voltage lines or lines with high interference levels. Keep a mini-
mum distance of 20 cm to such cable trays.
It is recommended to use shielded network cables of category Cat. 7 for the network
connection.
For connection to the SSI or RS 485 interface (ZX09 series only) a shielded, twisted
pair cable is required (see Fig. 15).
Tighten the screws of the connection terminals to a maximum of 0.8 Nm.
Warning
The operating voltage (DC 24V) must correspond to the specifications
given in chapter 12 "Technical data".
The voltages at the digital inputs must correspond to the specifications
given in chapter 12 "Technical Data".
The voltages and currents at the analog input must correspond to the
specification given in chapter 12 "Technical Data".
The voltage applied to the voltage input of the digital outputs ("U+")
must correspond to the specifications given in chapter 12 "Technical
Data".
Do not connect external voltage to the digital outputs.
The supply voltage must be switched off during wiring. The supply
voltages of all sensors and actuators must also be switched off.
Non-observance of these instructions can result in the destruction of
electronic components within the device! In this case, warranty or
guarantee claims are excluded.
