system while the SBW timers are running. The value can be optimized with increased familiarity
with the system. See par. 25-25
OBW Time
.
To avoid unintended staging during the commissioning phase and fine tuning of the controller,
initially leave the OBW at the factory setting of 100% (Off). When the fine tuning is completed, the
OBW should be set to the desired value. An initial value of 10% is suggested.
25-22 Fixed Speed Bandwidth
Range:
Function:
Application
dependent*
[Application dependant]
25-23 SBW Staging Delay
Range:
Function:
15 s*
[0 - 3000 s]
Immediate staging of a fixed speed pump is not desirable when a momentary pressure drop in the
system exceeds the Staging Bandwidth (SBW). Staging is delayed by the length of time program-
med. If the pressure increases to within the SBW before the timer has elapsed, the timer is reset.
25-24 SBW Destaging Delay
Range:
Function:
15 s*
[0 - 3000 s]
Immediate destaging of a fixed speed pump is not desirable when a momentary pressure increase
in the system that exceeds the Staging Bandwidth (SBW). Destaging is delayed by the length of
time programmed. If the pressure decreases to within the SBW before the timer has elapsed, the
timer is reset.
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Automation VT Drive FC322
Programming Guide
2 Parameter Description
MG.20.W1.22 - VLT
p
is a registered Danfoss trademark
243
2
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