Fault Reaction Function; Fso Module - ABB +Q950 User Manual

18 Option description
1) To parallel FSO modules (if any)
2) To parallel inverter modules (if any)
P POUS indication lamp (user-defined)
A68 Safety functions module FSO-12/-21
X113, X114 Terminal block in the FSO module
X113:3 POUS request 1
X114:3 POUS request 2
X113:6 POUS indication ground
X113:7 POUS indication
X111 STO connections to inverter control
A41 Inverter control unit
Qx Main contactor/breaker
T01 Supply unit
T11...Txx Inverter unit(s)
T11.x Inverter module(s) under inverter unit T11
Initial status: The drive is in operation and the motor is not running.
1. The user activates the POUS function by switching off the POUS switch [S]. This
activates the POUS function in the FSO module.
2. The FSO module de-energizes the STO inputs on the inverter control units. This activates
the inverter units' STO function. The inverter units indicate the status. See section
Activating the safety function.
3. The POUS indication lamp [P] switches on.
4. The user cannot start the motor(s) while the inverter units' STO function is on.
5. Normal operation resumes after the user:
• switches on the POUS switch [S]
• resets the inverter units (if parameter 31.22 STO indication run/stop has been set
so that a fault is generated).

Fault reaction function

Definition: The safety function has a 'fault reaction function' that attempts to bring the
systems to a safe state if it detects any failure within the safety system:
• a short or open circuit or redundancy failure of the POUS switch wiring chain, or
• any internal failure within the FSO module or the inverter unit STO.
This section describes the fault reaction functions in the FSO module and the inverter unit
STO.
￭

FSO module

The fault reaction function of the FSO module trips the inverter unit if it detects a failure.
The FSO module activates the STO or Safe stop emergency (SSE) function. This activates