Safety Block Diagrams; Relevant Failure Modes; Fault Exclusions; Operation Delays - ABB ACS880-07 User Manual

• FSE module: type B
• drive STO circuit:
• frame sizes R1...R9 and drives with R1i...R7i inverter modules: type A
• frame sizes R10 and R11 and drives with R8i inverter modules: type B.

Safety block diagrams

￭
The components that are included in the safety data calculations are shown in the safety
block diagram(s). The components not included in the delivery are not included in the safety
data calculations.
1 Emergency stop button
2 FSO module, and FSE module (if used)
3 Drive STO

Relevant failure modes

￭
Relevant failure modes are:
• the FSO module detects open circuits, short circuits and redundancy failures of the
emergency stop input signal wirings. Similarly, it detects redundancy failures of the
emergency stop button when the request is on.
• internal failures of the emergency stop button, the FSO module, the FSE module, and
the drive STO.
These failures are included in the failure rate value of the function.

Fault exclusions

￭
Fault exclusions (not considered in the calculations):
• short and open circuits in the cables of the safety circuit inside the cabinet
• short and open circuits in the cabinet terminal blocks of the safety circuits.

Operation delays

￭
Emergency stop total delay and fault reaction response time (includes the response time
of the drive STO):
• Stop category 0: less than 500 ms
• Stop category 1: Emergency stop ramp time + possible STO delay settings + less than
500 ms.
1 2
Technical data 55
3