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D-33
Electrical diagrams
Source-changeover system with UA controller
Load shedding and genset management
DB101757
DB101758
Transfer conditions
DB101759
Terminals 20 and 21:
additional control contact (not part of
controller).
Tests on “Normal” and “Replacement”
source voltages
“Normal” source voltage UN test
DB101761
“Replacement” source voltage UR test
The single-phase check for UR is
implemented across terminals 1 and 5
of circuit breaker Q2.
Legends
Q1
circuit breaker supplying and protecting the automatic-
control circuits for the “Normal” source
Q2
circuit breaker supplying and protecting the automatic-
control circuits for the “Replacement” source
ACP
control plate
UA
automatic controller
IVE
electrical interlocking and terminal block unit
Note:
diagram shown with circuits de-energised, circuit breakers open
and relays in normal position.
Source-changeover systems
with automatic controllers
2 Compact NSX100/630, NS630b/1600
or Masterpact NT/NW devices