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10.3
Fixed Lag - Conditions for De-staging Lag Drives
1. Feedback is above the setpoint PID-11 (PID Ref 1 Set).
2. Output Frequency of the Main drive reached the De-stage frequency AP1-70 (Destage Freq 1) for the Lag
drive.
3.
The De-Stage delay time AP1-54 (Destage DT) has expired.
10.4
Fixed Lag - De-staging Details
Three drives/motors/pumps are running and Drive 3 is the Main PI controlled drive. The feedback has increased to
a level above the setpoint. When the three conditions are met ((feedback above setpoint, operating frequency
reaches de-staging frequency and the delay time has expired), the Main drive decelerates and eventually stops.
With FILO operation, Drive 3 (M3) is the first to stop. Since Drive 3 (M3) is the Main PI controlled drive, a shift
occurs making Drive 2 (M2) the Main drive. As de-staging continues, Drive 2 (M2) decelerates and stops. Since
Drive 2 is now the Main PI controlled drive, a shift occurs making Drive 1 (M1) the Main drive. At this time, Drive 1
(M1) is operating as the Main drive and continues PI control. If the feedback continues to be above the setpoint, it
will also eventually stop or go into Sleep mode, if set. This is the
Last Out
for the FILO setting.
10.5
Fixed Lag FIFO - First In First Out
The above describes de-staging of the FILO (First In Last Out) setting. Parameter AP1-49 (ALT Sequence) can be
set to FIFO (First In First Out). With this setting, de-staging sequence changes. Below shows with Drive 3 (M3) as
the Main Drive, First Out is Drive 1 (M1), then Drive 2 (M2).
Fixed Lag - FIFO
Содержание RSi H2P Series
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