Data library
8.7 Formats
3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02
275
8.7.7 Data formats 401 to 426
The table below shows the format (401) "Trip unit: tripping operations'", which shows the last
unacknowledged tripping operation of the trip unit.
Table 8- 79 Format (401) Trip unit: "tripping operations"
Byte Value Meaning
0 0x00 No tripping operation
0 0x01 Overload (L)
0 0x02 Instantaneous short circuit (I)
0 0x04 Short-time delayed short circuit (S)
0 0x08 Ground fault (G)
The table below shows the format (402) "Trip unit: alarms" via which the trip unit
communicates the currently pending alarms.
Table 8- 80 Format (402) Trip unit: "Alarms"
Byte Value Meaning
0 0 Overload
0 1 Overload N-conductor
0 2 Load shedding
0 3 Load pick up
0 4 Phase unbalance current
0 5 Microprocessor fault
0 6 Ground fault
0 7 Overtemperature
1 0 Leading overload tripping alarm
1 1 Short-time mean value current
The table below shows format (405) "Contact status" that is calculated empirically from the
maintenance information.
Table 8- 81 Format (405) "Contact status"
Byte Value Meaning
0 0 No maintenance necessary yet on main contacts
(Note: Despite this, the main contacts must be checked after every
tripping operation!)"
0 1 Perform immediate visual inspection on main contacts.
0 2 Prepare maintenance of the main contacts
The table below shows the format (406) "Control trip unit" via which the statistical information
can be reset, among other things.
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