ABB ACS880-07 User Manual page 22

22 Electrical installation
the POUS switch. Connect the POUS switch to the terminals according to the circuit diagrams
of the delivery. Obey these general rules:
1. Use only double-contact switches. ABB recommends approved and lockable switches.
2. Connect the switch with two conductors (two-channel connection). Keep the channels
separate.
Note: If you use only one channel in a two-channel implementation, or if the channels
are connected together, the cross fault detection of the FSO module detects a redundancy
fault and activates the fault reaction function.
Note: If you change the input and the parameter settings in the FSO module into a
one-channel implementation, it has an effect on the safety integrity of the safety function.
In this case, the safety data that ABB has calculated for the function is not valid.
Note: The safety circuit design can be different when modified according to the customer's
safety requirements. Refer to the circuit diagrams delivered with the drive.
3. Use shielded, twisted pair cables. ABB recommends double-shielded cable and
gold-plated contacts in the POUS switch.
4. The maximum permitted cable length between the drive and the POUS switch is 250 m
(820 ft).
5. Obey the general control cable installation instructions given in the drive hardware manual.
If you use a POUS indication lamp, connect it to the applicable terminals. ABB recommends
an LED indication lamp. The maximum permitted cable length between the drive and the
indication lamp (for the whole loop) is 250 m (820 ft).