Danfoss VLT AQUA Drive FC 202 Programming Manual page 183

Parameter Description
22-26 Dry Pump Function
Select the action for dry-pump operation.
Option: Function:
NOTICE
[1] Warning
To use dry-pump detection:
1. Enable low-power detection in
parameter 22-21 Low Power
Detection.
2. Commission low-power detection
using either parameter group
22-3* No-flow Power Tuning No
Flow Power Tuning, or
parameter 22-20 Low Power Auto
Set-up.
NOTICE
Do not set parameter 14-20 Reset Mode to
[13] Infinite auto reset, when
parameter 22-26 Dry Pump Function is set
to [2] Alarm. Doing so causes the
frequency converter to continuously cycle
between running and stopping when a
dry-pump condition is detected.
NOTICE
For frequency converters with constant-
speed bypass.
If an automatic bypass function starts the
bypass at persistent alarm conditions,
disable the automatic bypass function, if
[2] Alarm or [3] Man. Reset Alarm is
selected as the dry-pump function.
The frequency converter continues to run, but
activates a dry-pump warning (warning 93, Dry
pump). A frequency converter digital output or a
serial communication bus can communicate a
warning to other equipment.
[2] Trip The frequency converter stops running and
activates a dry-pump alarm (alarm 93, Dry
pump). A frequency converter digital output or a
serial communication bus can communicate an
alarm to other equipment.
[3] Manual The frequency converter stops running and
Reset Trip activates a dry-pump alarm (alarm 93, Dry
pump). A frequency converter digital output or a
serial communication bus can communicate an
alarm to other equipment.
[4] Stop and
Trip
MG20OB02
Programming Guide
22-27 Dry Pump Delay
Range:
10 s
*
600 s]
22-28 No-Flow Low Speed [RPM]
Range:
Size related
22-29 No-Flow Low Speed [Hz]
Range:
Size related
3.19.3 22-3* No-flow Power Tuning
If auto set-up is disabled in parameter 22-20 Low Power
Auto Set-up, the tuning sequence is:
NOTICE
Set parameter 1-03 Torque Characteristics before tuning
takes place.
1.
2.
3.
4.
5.
Danfoss A/S © 05/2018 All rights reserved.
Function:
[0 - Defines for how long the dry-pump condition
must be active before activating a warning or an
alarm.
The frequency converter waits for the no-flow
delay time (parameter 22-24 No-Flow Delay) to
expire before the timer for the dry-pump delay
starts.
Function:
[ 0 - par. Used to set the speed for no-flow
*
4-13 RPM] low-speed detection.
If a low-speed detection at a speed
different from the motor minimum
speed is needed, this parameter may
be used.
Function:
[ 0 - par. Used to set the speed for no-flow
*
4-14 Hz] low-speed detection.
If a low-speed detection at a speed
different from the motor minimum
speed is needed, this parameter may
be used.
Close the main valve to stop flow.
Run with motor until the system has reached
normal operating temperature.
Press [Hand On] and adjust speed for approxi-
mately 85% of rated speed. Note the exact speed.
Read power consumption either by looking for
actual power in the data line in the LCP or by
viewing 1 of the following parameters:
4a Parameter 16-10 Power [kW].
Or
4b Parameter 16-11 Power [hp] in the Main
Menu.
Note the power readout.
Change speed to approximately 50% of rated
speed. Note the exact speed.
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