Danfoss VLT AQUA Drive FC 200 Programming Manual page 158

Parameter Description
22-75 Short Cycle Protection
Option:
[0] Disabled Timer set in 22-76 Interval between Starts is
3 3
[1] Enabled Timer set in 22-76 Interval between Starts is
22-76 Interval between Starts
Range:
Size related
*
- 3600 s]
22-77 Minimum Run Time
Range:
0 s [ 0 - par.
*
22-76 s]
NOTICE!
Does not work in cascade mode.
22-78 Minimum Run Time Override
Option:
[0]
[1]
22-79 Minimum Run Time Override Value
Range:
0 ProcessCtrlUnit
3-132
Function:
disabled.
enabled.
Function:
[ par. 22-77 Sets the time desired as minimum
time between two starts. Any
normal start command (Start/Jog/
Freeze) will be disregarded until the
timer has expired.
Function:
Sets the time desired as minimum run time
after a normal start command (Start/Jog/
Freeze). Any normal stop command will be
disregarded until the set time has expired. The
timer will start counting following a normal
start command (Start/Jog/Freeze).
The timer will be overridden by a Coast
(Inverse) or an External Interlock command.
Function:
Disabled
Enabled
[-999999.999 - 999999.999
*
ProcessCtrlUnit]
MG20O622 - VLT
®
VLT AQUA Drive Programming Guide
3.19.8 22-8* Flow Compensation
Sometimes it is not possible for a pressure transducer to
be placed at a remote point in the system and it can only
be located close to the fan/pump outlet. Flow compen-
sation operates by adjusting the setpoint according to the
output frequency, which is almost proportional to flow,
thus compensating for higher losses at higher flow rates.
H (Required pressure) is the setpoint for closed-loop
DESIGN
(PI) operation of the adjustable frequency drive and is set
as for closed-loop operation without flow compensation.
Figure 3.55
There are two methods which can be employed,
depending upon whether or not the Speed at System
design Working Point is known.
Function:
®
is a registered Danfoss trademark