ABB REB500 - Page 18

Section 2 1MRK 505 351-UEN
Commissioning
10 Commissioning Manual
Distributed busbar protection REB500
· Reading the statuses via the HMI500 by selecting “Binary input/output
status” in the “View” menu
· Checking the events generated in the event list.
Besides showing the correct operation, the event list also provides a
mean to check the correct functional assignment of the input.
2.2.6.1 Wiring for auxiliary contacts
The standard wiring of the N/C auxiliary contacts on L1, L2 and L3 phases of
isolators and circuit-breakers is in series and the N/O contacts in parallel.
This is reversed in case of the special version “not OPEN = CLOSED”.
Figure 1 Switching sequence of auxiliary contacts
ABB principle:
Isolator
closed
open
Current measurement
open
closed
open
1
0
1
1
1
1
1
1
1
0
0
0
0
0
0
0
closed
open
Current measurement
not OPEN= CLOSED:
(When both isolator position
inputs are inverted)