Fault Reaction Function; Hardware Settings - ABB ACS880-07 User Manual

26 Option description

Fault reaction function

Definition: A safety function requires a "fault reaction function" that tries to initiate a safe
state if it detects a failure in the safety system.
The fault reaction function of the emergency stop safety relay trips the system, if it detects
a failure in the safety circuit (for example, short circuit between signals, open circuit, or
redundancy fault).
If a fault is detected, the fault reaction function:
• activates the emergency stop command
• activates the STO function
• opens the main contactor/breaker
• keeps the safe state activated and the emergency stop reset button indication lamp on
until the fault is repaired and the safety function is reset.
Note: Resetting the safety function is not possible, if the reset circuit in the emergency stop
safety relay is open.
If the reset button [S62] is pressed for more than 10 seconds, the emergency stop safety
relay [A61] goes into a fault state. If this occurs, the user must reset the safety relay. See
the fault tracing instructions in this manual.

Hardware settings

Set the time delay of the emergency stop safety relay [A61] according to the application
needs with the rotary switches on the safety relay.
Switch
t
Fkt
t
max
t
Example: If the required time (t
• t = 30 s and t = 1 (t
max
• t = 300 s and t = 0.1 (t
max
Set the delay for the emergency stop safety relay [A61] a little longer than the emergency
stop deceleration time defined by drive parameters 23.23 and 46.01 or 46.02. See chapter
Parameter settings (page
Value
1
User-defined
User-defined
) is 30 s, set:
v
= t · t = 30 s · 1 = 30 s), or
v max
= t · t = 300 s · 0.1 = 30 s).
v max
29).
Description
Selects the delay mode. Must be 1.
Selects the time range (in seconds)
for the delayed contacts.
Value range: 1 ... 300 s.
Adjusts the time within the selected
range in 10% steps.
Value range: 0.1...1.