Undervoltage/Overvoltage - ABB AC500-S Safety User Manual

AC500-S Safety Modules
Generic Safety I/O module behaviour > Undervoltage/Overvoltage

3.2.3 Undervoltage/Overvoltage

If undervoltage (< 18 V) is detected in the Safety I/O module, the module goes to RUN (module passivation)
state, until the process voltage did not reach the threshold shut-down value (16 V), when no further commu-
nication to PROFIsafe F-Host is possible. If the threshold shut-down value (16 V) was not reached during
undervoltage phase and the process voltage is back in the normal range (≥ ~18 V), the Safety I/O module
reintegrates and goes to RUN (ok) state automatically.
To avoid unintended permanent module passivation and reintegration, the following feature is available for
undervoltage case:
n The user has to continuously supervise Device_Fault bit of the Safety I/O module and if Device_Fault = 1
is detected, he passivates the module with activate_FV_C = 1.
If overvoltage (> 31.2 V) is detected in the Safety I/O module, the module goes to RUN (module passivation)
state, until the process voltage did not reach the threshold fuse value (> 35 V) when the Safety I/O module is
damaged and has to be replaced. If the threshold fuse value was not reached during overvoltage phase and
the process voltage is back in the normal range, the Safety I/O module reintegrates and goes to RUN (ok)
state automatically. To avoid unintended permanent module passivation and reintegration, the same feature
(supervision of Device_Fault bit) as for undervoltage is available.
70 AC500-S 30.03.2017