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.