User Manual

Description
2.4 Electronic trip unit ETU600
3WA Air Circuit Breakers
Equipment Manual, 05/2021, 92310000002-03
93
2.4.5 Protection parameters
2.4.5.1 Parameter sets A and B
Note
Parameters can also be changed in the energized condition. However, parameters should not
be changed in the energized condition, as the operator may experience unexpected tripping.
The basic protective functions of the ETU600 electronic trip unit can be set quickly and easily
using the rotary switches on the front of the ETU600, see Chapter Rotary switch (Page 73).
Each rotary switch has nine permanently assigned values and the position e.SET.
If the rotary switch is set to “e.SET”, the parameter can be freely selected within its limits and
set via the display or by means of the SENTRON powerconfig configuration software via
Bluetooth or communication.
In addition to the five parameters for the basic protective functions, there are other
parameters which influence the behavior of the circuit breaker in the overcurrent range. All
parameters and their basic settings are shown below.
Protective functions whose parameters cannot be selected via the rotary switches must be set
via the display or with the SENTRON powerconfig configuration software via Bluetooth or
communication.
The ETU600 electronic trip unit allows the storage of two different sets of parameters for the
protective functions. This allows the changed protection requirements to be taken into
account in the event of changed power supply conditions, e.g. in the event of emergency
supply via an emergency power generator.
Each parameter set contains the following data (for basic settings on delivery from the
factory, see ChapterBasic settings of parameter data sets (Page 499)):
ETU600 LSI, ETU600 LSIG, ETU600 LSIG Hi-Z
Protective function
Setting range
Settings with rotary switch
L: Long time LT
Tripping
Can be switched on/off
Current setting Ir 0.4 ... 1.0 x In 0.5 / 0.6 / 0.7 / 0.75 / 0.8 / 0.85 / 0.9 /
0.95 / 1.0 x I
n
Tripping time t
r
at 6 x I
r
At I
2
t: 0.5 ... 30 s
At I
4
t: 0.5 … 5 s
1 / 2 / 5 / 8 / 10 / 14 / 17 / 21 / 25 s
Characteristic LT curve I²t / I
4
t
Thermal memory
Can be switched on/off
Cooling time constant
10 / 18 x t
r
Phase failure detection Can be switched on/off
Overload pre-alarm PAL
Can be switched on/off
Current setting I
r PAL
0.7 … 1.0 x I
r
Delay time t
r PAL
0.5 … 1.0 x t
r