ABB ACH550-01 User Manual page 116

0.75...110 kw/1...150 hp

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9. Internal timer with constant speeds / Powered roof

This application macro is intended e.g. for timed powered roof

ventilator applications which alternate between two constant

speeds (constant speed 1 and 2) with a built-in timer. This macro

also has a boost function, which activates constant speed 2 after

digital input 3 (DI3) has been momentarily activated. See the

figure below.

For further information, see chapter

ACH550 User's Manual

Real-time clock and timed

Application macros and wiring

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