Operation Principle Diagram - ABB ACS880 User Manual

28 Option description
This time scheme diagram illustrates the operation of the SSM1 function.
Motor speed
A
B
A SSM1 limit positive (parameter SSMx.13)
B SSM1 limit negative (parameter SSMx.12)
1. The motor speed goes above the SSM limit positive. The SSM indication goes off.
2. The motor speed goes below the SSM limit positive. The SSM indication goes on.
3. The motor speed goes below the SSM limit negative. The SSM indication goes off.
4. The motor speed goes above the SSM limit negative. The SSM indication goes on.

Operation principle diagram

￭
You can use a switch or a PLC to connect the SLS activation signal to the FSO module.
SLS networks are created by connecting the SLS activation signal to the FSO modules with
external wirings outside the cabinet. For more information, refer to the circuit diagrams
delivered with the inverter unit.
This example diagram shows two drives equipped with FSO modules in a network. The
SLS function is activated from an SLS switch. This is common to both FSO modules. The
SLS and SSM indications are separate.
Note: In different trip limit situations (for example, when the motor speed reaches an SLS
or SMS trip limit), the FSO module trips only the inverter unit in which it is installed.
The figure shows a simplified operation principle. For a more detailed description, refer to
the circuit diagrams delivered with the drive.
3
1 2
Time
4
SSM indication