OMICRON 189
Off-service diagnostic methods
17.2.7 Dynamic Contact Resistance test
The Dynamic Contact Resistance test measures the resistance of the circuit breaker’s main contacts
during opening or closing. With the CB TN3 modules, you can also measure the displacement of the
circuit breaker’s main contacts during operation (see 17.5 "Testing circuit breakers with CIBANO 500
and the CB TN3 modules" on page 252).
Note: To perform the Dynamic Contact Resistance test, you need a license. Without the license, it is not
possible to start the measurement and Primary Test Manager displays a missing license message. To
get the license, contact your regional OMICRON service center.
Connection
To connect the test object to CIBANO 500:
1. Connect the CB MC2 to CIBANO 500 with the EtherCAT
®
cable.
2. If the CB MC2 modules are not connected from the last test, hook up the CB MC2 to the first or the
first two interrupter(s) of the circuit breaker.
3. Connect the CB MC2 to the main contact of the circuit breaker with the delivered cables and clamps.
4. Repeat steps 1 to 3 for all interrupters you want to test.
5. Make sure that all cable connectors are clean and dry before being tightly connected.
6. In Primary Test Manager, open the Dynamic Contact Resistance test.
WARNING
Death or severe injury caused by high voltage or current possible
► Do not connect anything to the circuit breaker under test without grounding the circuit breaker.
► Always ground the circuit breaker on both ends on all phases and close the circuit breaker to
have proper grounding between the interrupters.
WARNING
Death or severe injury caused by high voltage or current possible
► Do not connect the EtherCAT
®
cables to the CB MC2 module before they are connected to
CIBANO 500.
► Connect the EtherCAT
®
cables first to CIBANO 500 and then to the CB MC2 module.
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