Siemens SENTRON 3WL10 Series Manual page 148

Connection and commissioning
5.4 Commissioning
The following tests must be conducted for inspection before re-commissioning after tripping
and after lengthy storage under certain environmental conditions. These can be performed
with a TD310 test device to power the ETU. They are not mandatory for a device from the
factory because the circuit breaker is completely and thoroughly tested, including all installed
accessories, before delivery. A trip test confirms correct mechanical functioning of the
tripping plunger on the trip coil, actuated by the ETU. Electronic monitoring of the entire
connection between the current transformers, ETU, and trip coil is performed continuously by
the electronics itself (watchdog).
Items to be tested
Enable alarms
Status of the circuit breaker
Trip test
If present
1)
146
Checks
1)
Connect the ETU to a test device and check that no alarms are pre-
sent.
On the ETUs of the 3-series, the status of the circuit breaker must not
be incorrect (see tables of the LED display in Chapter Alarms
(Page 161)). Perform a close/open operation on the circuit breaker
and check that no alarms have occurred.
On the ETUs of the 6-series, the status of the circuit breaker must be
correctly shown on the display. Perform a close/open operation on the
circuit breaker and check that the change in circuit breaker status is
correctly displayed.
Make a trip attempt with the circuit breaker closed during an idle peri-
od (without circulating currents of the mains connection) and check
that the circuit breaker opens.
Air circuit breaker 3WL10
Manual, 11/2017, L1V30499596002-01