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USER MANUAL
ST2
The TRIP signal is evaluated ‘on the edge’ and not ‘on the level’ , it means that in order to enable the booster the TRIP
status must change from ‘not active’ to ‘active’. It cannot be ‘active’ all the time, if you need the booster all the time
you need to select mode=’Normal’
When the Mode is ‘With Enable’ the SafetyShutdown mode related to a booster cannot be used like in the previous sw
versions for a Quickopen or QuickClose function because it is automatically disactivated when the error is less than the
‘disactivation threshold’.
Examples of movement :
Booster ‘with enable’, PV not used.
The setpoint is changed
The slope changes because the
BOOSTER is activated
TRIP is activated
and the
BOOSTER are
fired
PV is used at the beginning (
before the enable that come from
the TRIP)
PV is used at the end when the
booster is disactivated
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www.stiactuation.com
IOM 4029 - ST2 User manual - rev.3 01/2012
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