Siemens SINAMICS S150 Operating Instructions Manual page 236

Operation
6.7 Control via the operator panel
Fault and alarm displays
Every fault and alarm is entered in the fault/alarm buffer along with time the error occurred.
The time stamp refers to the relative system time in milliseconds (r0969).
You can call up an overview screen that displays the current status of faults and/or alarms
for every drive object in the system by choosing MENU – Fault memory / alarm memory.
A context menu featuring the "Back" and "Quit" options appears when you press F4 "Next".
The function required can be selected using F2 and F3 and executed by pressing F5 "OK".
The "Acknowledge" function sends an acknowledgement signal to each drive object.
The red FAULT LED extinguishes once all the faults have been acknowledged.
Figure 6-32 Fault screen
You can use F5 Ack. to acknowledge a stored fault.
Figure 6-33 Alarm screen
Alarms that are no longer active are removed from the alarm memory with F5 Clear.
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Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A