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Description
2.5 Electronic trip unit ETU600
2.5.5.3
Parameter set B (optional)
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.
All data of parameter set B can only be changed using the operating keys on the display
or with the help of the SENTRON powerconfig configuration software.
Switching between the parameter sets
Switching between the parameter sets A and B can be done manually via:
• Operating keys on the display of the ETU600 electronic trip unit
• Digital ETU600 input on circuit breaker, terminals X8-5 and X8-6
• Input signal on a digital input/output module
• Switchover command via a communications module
• SENTRON powerconfig configuration software
For security reasons, parameter set B can only be deactivated using the same method by
which it was activated.
2.5.5.4
Setting range for parameter sets A and B
Each parameter set contains the following data (for basic settings on delivery from the
factory, see Chapter Basic settings of the electronic trip unit on delivery (Page 551)):
Note
When instantaneous short-circuit protection INST is deactivated, the rated service short-
circuit breaking capacity I
I
(I
cw
With the ETU600 electronic trip unit, short-time-delayed short-circuit protection ST and
instantaneous short-circuit protection INST cannot be deactivated simultaneously.
• If INST is deactivated while ST is already deactivated, instantaneous short-circuit
protection INST is automatically activated with the maximum current setting I
• If ST is deactivated while INST is already deactivated, instantaneous short-circuit
protection INST is automatically activated with the maximum current setting I
114
cs
= I
).
cs
cw
of the circuit breaker is reduced to rated short-time current
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
.
i
.
i
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Troubleshooting
