Danfoss VLT AQUA Drive FC 202, Programming Manual, Page: 183 / 294

22-26 Dry Pump Function
Select the action for dry-pump operation.
Option: Function:
[1] Warning
NOTICE
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
Reset 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.
[4] Stop and
Trip
22-27 Dry Pump Delay
Range: Function:
10 s
*
[0 -
600 s] 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.
22-28 No-Flow Low Speed [RPM]
Range: Function:
Size related
*
[ 0 - par.
4-13 RPM] Used to set the speed for no-flow
low-speed detection.
If a low-speed detection at a speed
different from the motor minimum
speed is needed, this parameter may
be used.
22-29 No-Flow Low Speed [Hz]
Range: Function:
Size related
*
[ 0 - par.
4-14 Hz] Used to set the speed for no-flow
low-speed detection.
If a low-speed detection at a speed
different from the motor minimum
speed is needed, this parameter may
be used.
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. Close the main valve to stop flow.
2. Run with motor until the system has reached
normal operating temperature.
3. Press [Hand On] and adjust speed for approxi-
mately 85% of rated speed. Note the exact speed.
4. 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.
5. Change speed to approximately 50% of rated
speed. Note the exact speed.
Parameter Description Programming Guide
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