If necessary, install additional emergency stop buttons on site. See the tables above and
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, 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.
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). See 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.
When a safety pulse encoder is used, ABB installs the FSO-21 and FSE-31 modules and
the wirings between the FSO module and the drive at the factory.
The user must wire the safety pulse encoder to the FSE-31 module on site. Obey the
instructions of the encoder manufacturer as well as the following rules:
• Use a double-shielded, twisted pair cable.
• The maximum permitted cable length between the safety pulse 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]).
￭ Customer-installed main breaker in ACS880-07LC/17LC/37LC drives
ACS880-07LC/17LC/37LC drives can be delivered without a factory-installed main breaker.
In these cases, the customer must install and connect the main breaker to the safety circuit
as described in the circuit diagrams.
42 Electrical installation
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