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8.1.5
Automatic mode (AUT)
The AUT operating mode is indicated by the illumination of the corresponding yellow LED.
In the automatic mode the mechanism automatically performs not only the opening and
closing of the breakers and of the tie breaker, but also the switching on and off of the gen-
sets, where present.
If the values of the priority source are outside the thresholds (orange LED "Line presence"
goes out), the unit disconnects the load from the priority source after expiry of the set delay
and connects it to the secondary source. Not only the startup of any available generator, but
also the switching and interlock time are controlled in this process. The ATC6500 must be
programmed so that the priority source breaker is opened before or after the secondary
source has been made available.
As soon as the priority source comes back within the limits, the unit will switch back the load
on it and initiate the cooling of the generator. Furthermore, a lock can be set to prevent the
automatic return to the priority source.
The cycles of automation operation vary not only according to the type of application
(network / network, network / generator, generator / generator), or according to the type of
breaker used (breakers with motor operators, or contactors), but also according to the set
application. The various applications can be viewed under chapter Load management with
the ATC6500 (Page 20).
Automatic transfer can also take place in IN-PHASE mode. It goes without saying that
defined limits must be observed (see also chapter Voltage measurement (Page 28) and
chapter P08 - Switch (Page 171)).
3KC ATC6500 transfer control device
Manual, 05/2019, L1V30538268002A-01
8.1 Operating modes of the ATC6500
Operation
143
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