User Manual

Description
2.3 Protection system
3WA Air Circuit Breakers
66 Equipment Manual, 05/2021, 92310000002-03
Activation
The DAS+ maintenance mode can be activated in various ways.
Activation options:
• Digital ETU input of the circuit breaker, secondary disconnect terminals X8-5 and X8-6.
Depending on the selected signal state (LOW/HIGH), the input can be controlled via an NC
contact or an NO contact.
• Button on the display of the ETU600 electronic trip unit
• Input of a digital input/output module
• Via the fieldbus interfaces of a communication module, see Chapter Communication and
system connection (Page 106).
The activated DAS+ maintenance mode is indicated by the blue LED on the electronic trip unit
and on the display.
A message can also be sent via the following signals:
• Digital ETU output of the circuit breaker, secondary disconnect terminals X8-7 and X8-8
• Via an output of a digital input/output module
• Via fieldbus communication
Note
For security reasons, the DAS+ maintenance mode can only be deactivated using the same
method by which it was activated.
Application examples
The following figure shows the activation of the DAS+ maintenance mode by the digital ETU
input with a normally-closed contact (NC) and a normally-open contact (NO).
• LOW signal (NC):
The DAS+ maintenance mode is active when there is no signal present at the secondary
disconnect terminals X8-5 and X8-6 (example ①)
• HIGH signal (NO):
The DAS+ maintenance mode is active when there is a signal present at the secondary
disconnect terminals X8-5 and X8-6 (example ②)