Siemens Sinamics S110 Function Manual page 116

Diagnostics
5.3 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 W_NCA alarms
= 2: Alarm class W_NCB alarms
= 3: Alarm class W_NCC alarms
These attributes for differentiating the alarms are assigned implicitly 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
● W_NCA: Drive operation currently not limited
● W_NCB: Time-limited operation
● W_NCC: Functionally limited operation
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– e.g. alarm when measurement systems inactive
– no limitation on current movement
– Prevent possible switching to the defective measuring system
– e.g. prewarning temperature: without further action the drive may need to be switched
off
– after a timer stage → additional fault
– after exceeding a trip threshold → additional fault
– e.g. reduced voltage/current/torque/speed limits (i2t)
– e.g. continue with reduced accuracy / resolution
– e.g. continue without encoder
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
Function Manual