Sms Function; Ssm Function - ABB ACS880 User Manual

32 Electrical installation
For the terminal designations, see the circuit diagrams delivered with the inverter unit. If
you use a switch for SLS activation, obey these general rules:
1. Connect the SLS request 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.
2. Use a shielded, twisted pair cable. ABB recommends double-shielded cable.
3. Make sure that the sum resistance for one channel (loop resistance) from the field to
the FSO module is not more than 1 kohm.
4. The maximum permitted cable length between the inverter unit and the activation 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.
6. Do not use test pulses in the FSO inputs.
If the SLS activation request comes from a PLC digital transistor output, obey these rules:
1. Do not use test pulses in the FSO inputs.
2. The PLC must monitor the request signals. For more information, see the documentation
of your PLC.

SMS function

￭
It is not necessary to make connections for the SMS function.

SSM function

￭
If necessary, connect the SSM indication signal output of the FSO-21 module. Refer to the
circuit diagrams of the delivery.