Siemens Sinamics S120 Comissioning Manual page 184

Diagnostics
5.4 Fault and alarm messages
ZSW2: Valid for SIMODRIVE 611 Interface Mode p2038 = 1 (function diagram 2453)
Bit 11 - 12 Alarm classes alarms
= 0: Alarm (former alarm level)
= 1: Alarm class A alarms
= 2: Alarm class B alarms
= 3: Alarm class C alarms
These attributes for differentiating the alarms are assigned to the appropriate alarm
numbers. The reaction to the existing alarm classes in the alarm is defined by the user
program in the higher-level control.
Explanations of the alarm classes
● Alarm class A: Drive operation currently not limited
– E.g. alarm when measurement systems inactive
– No limitation on current movement
– Prevent possible switching to the defective measuring system
● Alarm class B: Time-limited operation
– E.g. prewarning temperature: Without further action the drive may need to be switched
– After a timer stage -> additional fault
– After exceeding a switch-off threshold -> additional fault
● Alarm class C: Functionally limited operation
– E.g. reduced voltage/current/torque/speed limits (i2t)
– E.g. continue with reduced accuracy / resolution
– E.g. continue without encoder
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Commissioning Manual, (IH3), 07/2016, 6SL3097-4AA10-0BP0
Commissioning with Startdrive