ABB ACS880-07 User Manual page 32

32 Electrical installation
If necessary, install additional emergency stop buttons on site. Refer to the circuit diagrams
delivered with the drive. Obey these general rules:
1. Use only double-contact buttons approved for emergency stop circuits.
2. Connect the emergency stop buttons 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 emergency stop button.
4. The maximum permitted cable length between the drive and the emergency stop button
is 250 m (820 ft).
5. Obey the general control cable installation instructions given in the drive hardware manual
and in the FSO module user's manual.
If necessary, install additional reset buttons and indication lamps for the emergency stop
circuit on site. ABB recommends gold-plated NC contacts in the reset button. The maximum
permitted cable length between the drive and the reset button (for the whole loop) is 250 m
(820 ft). Refer to the circuit diagrams of the delivery. Obey the general control cable
installation instructions given in the hardware manual and in the FSO module user's manual.
If you use a safety encoder in the application: Connect the safety encoder to the FSE-31
module on site. Obey the instructions of the encoder manufacturer and the following rules:
• Use a double-shielded, twisted pair cable.
• The maximum permitted cable length between the safety encoder and the FSE-31 module
is 300 m (980 ft).
For more information, see FSE-31 pulse encoder interface module user's manual
(3AXD50000016597 [English]).