ABB Q952 - Diagram 4: ACS880-17;17 LC;37;37 LC Drives, Frames N×R8 I + N×R8 I; Diagram 5: ACS880-07;07 LC Drives, Frames N×Dxt + N×R8 I with One Contactor or Main Breaker; Relevant Failure Modes; Fault Exclusions

Diagram 4: ACS880-17/17LC/37/37LC drives, frames n×R8i + n×R8i
1 2 3 4 5
6
7
Emergency stop button1
Emergency stop safety relay2
Auxiliary safety relay3
Charging contactor4
Auxiliary safety relay5
Main contactor or main breaker6
Main contactor or main breaker7
Note: Only some variants have two main contactors or main breakers.
Diagram 5: ACS880-07/07LC drives, frames n×DXT + n×R8i with one contactor or main
breaker
1 2 3 4
Emergency stop button1
Emergency stop safety relay2
Auxiliary safety relay3
Main contactor or main breaker4
￭ Relevant failure modes
Relevant failure modes are:
• the main contactor/breaker does not open when requested. (All contactor/breaker failures
are considered dangerous.)
• internal failures of safety relays and the emergency stop button. These failures are
included in the PFH value of the function.
￭ Fault exclusions
Fault exclusions (not considered in the calculations):
• any short and open circuits in the cables of the safety circuit
• any short and open circuits in the cabinet terminal blocks of the safety circuits.
￭ Operation delays
Emergency stop total delay: emergency stop deceleration ramp time + 500 ms.
54 Technical data