ABB +Q950 User Manual page 26

26 Electrical installation
Note: Keep the channels separate. If you use only one channel, or if the first and second
channels are connected together (for example, in a chain), the cross-fault detection of
the FSO module trips and activates the STO function of the inverter unit.
Note: If you change the input and the parameter settings in the FSO module into a
one-channel implementation, it affects the safety integrity of the safety function. The
safety data that ABB has calculated for the function is not valid.
3. Use shielded, twisted pair cables. We recommend a double-shielded cable and
gold-plated contacts in the POUS switch.
4. The maximum allowed cable length between the inverter unit and the POUS switch (for
the whole loop) is 250 m (820 ft).
5. Obey the general control cable installation instructions given in the inverter unit hardware
manual.
If you use a POUS indication lamp, wire it to the appropriate terminals in the terminal block
[X68]. We recommend an LED indication lamp. The maximum allowed cable length between
the inverter unit and the indication lamp (for the whole loop) is 250 m (820 ft). See the table
above, section Operation principle diagram, and the circuit diagrams of the delivery.