Danfoss VLT AQUA Drive FC 202 Programming Manual page 155

Parameter Description
22-26 Dry Pump Function
Select desired action for dry pump operation.
Option: Function:
[0] Off
[1] Warning The frequency converter continues to run, but
activates a dry pump warning [W93]. A
frequency converter digital output or a serial
communication bus can communicate a
warning to other equipment.
[2] Alarm The frequency converter stops running and
activates a dry pump alarm [A93]. A frequency
converter digital output or a serial communi-
cation bus can communicate an alarm to other
equipment.
[3] Manual The frequency converter stops running and
Reset Alarm activates a dry pump alarm [A93]. A frequency
converter digital output or a serial communi-
cation bus can communicate an alarm to other
equipment.
NOTICE
Low Power Detection must be Enabled
(parameter 22-21 Low Power Detection) and commis-
sioned (using either parameter group 22-3* No-flow
Power Tuning No Flow Power Tuning, or
parameter 22-20 Low Power Auto Set-up) to use Dry Pump
Detection.
NOTICE
Do not set 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
If the frequency converter is equipped with a constant
speed bypass with an automatic bypass function that
starts the bypass if the frequency converter experiences
a persistent alarm condition, be sure to disable the
bypass's automatic bypass function, if [2] Alarm or [3]
Man. Reset Alarm is selected as the dry pump function.
22-27 Dry Pump Delay
Range: Function:
10 s [0 - 600 Defines for how long the dry pump condition
*
s] must be active before activating warning or
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.
MG20O702
Programming Guide
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
Tuning sequence, if not selecting Auto Set Up in
parameter 22-20 Low Power Auto Set-up:
1.
2.
3.
4.
5.
6.
7.
Danfoss A/S © Rev. 2014-01-21 All rights reserved.
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 low
*
4-14 Hz] 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 approx.
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 call
4a parameter 16-10 Power [kW]
or
4b parameter 16-11 Power [hp] in Main
Menu.
Note the power read out.
Change speed to approx. 50% of rated speed.
Note the exact speed.
Read power consumption either by looking for
actual power in the data line in the LCP or call
6a parameter 16-10 Power [kW]
or
6b parameter 16-11 Power [hp] in Main
Menu.
Note the power read.
Program the speeds used in
7a parameter 22-32 Low Speed [RPM]
7b parameter 22-33 Low Speed [Hz]
7c parameter 22-36 High Speed [RPM]
7d parameter 22-37 High Speed [Hz]
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