ABB Busch-Dimmer 6593 U-500 Manual Del Usuario página 48

Setting up
24 Setting up
Universal Dimmer - Functional Description
Upon connection of the supply voltage, the microprocessor
integrated in the dimmer evaluates the characteristics of
the connected service load and decides whether
phaseangle or phase-section control is to be employed.
During this calibration process, the lighting system is
switched on for up to two seconds and the unit is blocked.
In order to ensure that the precise load is
recognised by the dimmer, this should
neither be operated with short circuit nor with
secondary open-circuit conventional
transformers when the supply voltage is
connected.
ENG 48