Inspection and maintenance
5.4 Performing inspection
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
399
5.4.10 Testing of the function of the CubicleBUS² modules
Check the following items:
• Secure fitting and wiring damage for the following components:
– All modules mounted on the circuit breaker, e.g. COM190 or IOM230
– Internal CubicleBUS
2
components, e.g. breaker status sensor BSS200
– Externally installed CubicleBUS
2
modules
• Error conditions of the CubicleBUS
2
modules indicated by LED statuses.
For more information on LED statuses, see Chapters Communication and system
connection (Page 138) and Accessories (Page 227).
• Presence of CubicleBUS
2
terminating resistor:
– Either on the last module (marked S, 120 Ω)
or
– If no modules are connected, on terminals X8-1 and X8-2 (marked L, 120 Ω)
• Observance of voltage tolerances
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