Danfoss VLT FC 100 Series Programming Manual page 183

®
VLT HVAC Drive Programming Guide
22-75 Short Cycle Protection
Option:
*
Disabled
[0]
[1] Enabled
22-76 Interval Between Starts
Range:
*
0 s [0 - 3600 s]
22-77 Minimum Run Time
Range:
*
0 s [0 - par. 22-76]
NB!
Does not work in cascade mode.
3.20.7. 22-8* Flow Compensation
It is sometimes the case that 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 compensation operates by adjusting the set-point 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 (PI) operation of the frequency converter and is set as for closed loop operation without flow
DESIGN
compensation.
It is recommended to use slip compensation and RPM as unit.
NB!
When flow compensation is used with the Cascade Controller (parameter group 25), the actual set-point will not depend on speed
(flow) but on the number of pumps cut in. See below:
Function:
Interval Between Starts
Timer set in par. 22-76
Interval between Starts
Timer set in par. 22-76
Function:
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.
MG.11.C5.02 - VLT ® is a registered Danfoss trademark
3. Parameter Description
is disabled.
is enabled.
3
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