ABB ECA06 - Page 125

Chapter 3: Configuration 3.6 Setting the Configuration
493-0736-11 (6-2) 125
Hold
Both the Simple and Advanced Set Point Ramp functions offer a hold feature. It
is activated by setting the parameter Hold to On. As described below, the ramps
are activated by a Non-Auto to Auto transition. When the ramp is running
(RampDone = False) an Auto to Non-Auto transition can either reset the ramp and
put it on hold (Hold = Off), or just put it on hold (Hold = On). A subsequent Non-
Auto to Auto transition will then either start the ramp from the beginning (Hold
= Off) or make it continue from where it was interrupted (Hold = On). The
function of the RampHold output may be summarized:
RampHold = (Hold = On) OR ManualStatus OR NOT RampDone
As long as the value of SPValue is changing the output RampActive is True; while
SPValue is constant RampActive is False.
The value of SPValue must be equal to the value of ISP/ESP for a period of time
defined by the parameter TimerTime before the ramp is complete and the SP
Block output RampDone is set to True.
The time unit used for TimerTime is set by the parameter TimeUnit.
The figure below shows the timing and function of a typical Simple Set Point
Ramp.