70 Program features
Timed functions
The base entity of Timed functions is called a Timer. A Timer can be active based on
time of the day, day of the week and season of the year. In addition to these time
related parameters, the Timer activation can be influenced by so called exceptional
days (configurable as holiday or workday). For example, 25.12. (Dec 25th) can be
defined as holiday in many countries. A Timer can be set to be active or inactive
during the exceptional days.
Several Timers can be connected to a Timed function with the OR function. Thus if
any of the Timers connected to a Timed function is active, the Timed function is also
active. Timed function is then in turn controlling normal drive functions like starting the
drive, choosing the right speed or right setpoint for the PID loop controller.
In many cases where a fan or pump is controlled with a Timed function, it is often
required that there is a possibility to override the time program for a short while. The
overriding functionality is called Boost. The Boost is directly affecting selected Timed
function(s) and switches it (them) on for a predefined time. The Boost mode is
typically activated through a digital input and its operation time is set in parameters.
A diagram illustrating the relations of the Timed functions entities is shown below.
Settings
Parameter group 34 Timed functions (page 191).
Time of the day
Workday
Day of the week Season
Exception
Holiday
Timer (12) Boost
Timed function (3)
Drive control, eg start,
control speed
Time of the day
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