gefran SIEIDrive ADV100 - Page 130

130 ADV100 • Functions description and parameters list
Menu PAR Description UM Type FB BIT Def Min Max Acc Mod
 11072 Constpressthrtime sec FLOAT 0.00 0.00 100000 RW FVS
This parameter denes the time for detecting that the constant pressure threshold has been exceeded. When the
error is below “Constpressurethr” for longer than “Constpressthrtime” the drive decelerates until it stops and
then moves to the “Constpressure” condition.
Example: suppose parameter 11002 Setpointvalof a pump pressure control is 10 bar, parameter 11070 Const
pressurethris set to 5% and parameter 11072 Constpressthrtimeis set to 15 seconds.
This means that the error threshold is 0.5 bar (10 bar X 5% = 0.5 bar), so that when the feedback value is more than
9.5 bar for more than 15 seconds, the drive decelerates until it stops. When the feedback value is less than 9.5 bar,
the drive restarts.
Menu PAR Description UM Type FB BIT Def Min Max Acc Mod
 11074 Constpressoffset % INT32 0 0 50 RW FVS
This parameter denes the offset (expressed as a percentage with respect to the set point) for moving from the con-
stant pressure condition and restarting the drive.
If the PID is in the constant pressure condition, to restart the drive the error must be higher than the value set in
parameter 11070 Constpressurethr+ parameter 11074 Constpressoffset.
Example: suppose the value of a pump pressure control set point (PAR 11002) is 10 bar, 11070 Constpressurethr
is set to 5%, PAR 11074 Constpressoffset is set to 4%.
This means that to move to the constant pressure condition the feedback must be more than 9.5 bar. To restart the
drive the feedback must be less than 9.1 bar (10 – (10bar X 5% + 10bar X 4%)).
11074
(2)
(1)
(3)
  (1)Setpoint
  (2)Feedbackvalue
  (3)Offsetlevelofliquidleakage
This parameter is used to avoid frequent start/stop operations due to leakages.
Menu PAR Description UM Type FB BIT Def Min Max Acc Mod
 11076 Fluidlossthr % FLOAT 0.0 0.0 100.0 RW FVS
This parameter denes the threshold (expressed as a percentage with respect to the set point) for a change in the
error in the time set in PAR 11078 Fluid loss thr time to detect a leakage and move from the constant pressure condi-
tion and restart the drive.
Menu PAR Description UM Type FB BIT Def Min Max Acc Mod
 11078 Fluidlossthrtime % FLOAT 0.10 0.01 10.00 RW FVS
This parameter denes the time for calculating the change in PIDerror to detect the leakage.
Note: If parameter 11076 Fluidlossthr= 0 the function is not enabled.
To move from the constant pressure condition, the function is enabled if the PID error is higher than the value set in PAR
11070 Constpressurethrotherwise each restart operation would correspond to an immediate stop with the return to the
constant pressure condition.