ABB ECA06 - Page 124

3.6 Setting the Configuration Chapter 3: Configuration
124 493-0736-11 (6-2)
The lowest speed makes the Set Point travel the whole span in 86 400 seconds (24
hours). RampSpeed
Min
is hence defined by (if TimeUnit = seconds):
or if TimeUnit = minutes:
The highest speed makes the Set Point travel the whole span in one second.
RampSpeed
Max
is hence defined by (if TimeUnit = seconds):
or if TimeUnit = Minutes:
The RampSpeed parameter uses the same number of decimals as defined by the
parameter NumberOfDecimals in the Operator Block.
Example
If MinValue = 10.0, MaxValue = 210.0, Unit = °C and TimeUnit = Minutes then:
span = 210.0 – 10.0 = 200.0
and:
The RampSpeed parameter in this example can be set between 0.14
(RampSpeed
Min
) and 12000 (RampSpeed
Max
).
Unit/second
RampSpeed
Min
span
86400
---------------
=
Unit/minute
RampSpeed
Min
span
1440
------------=
Unit/second
RampSpeed
Max
span
1
------------
=
Unit/minute
RampSpeed
Max
span 60×=
= 0.14 °C/minute
RampSpeed
Min
200
1440
------------=
RampSpeed
Max
= 200.0 × 60 = 12000 °C/minute