Danfoss VLT Programming Manual page 145

Parameter Description
22-26 Dry Pump Function
Select desired action for dry pump operation.
Option:
[0] Off
*
[1] Warning
3 3
[2] Alarm
[3] Man. Reset
Alarm
NOTE
Low Power Detection must be Enabled (22-21 Low Power
Detection) and commissioned (using either parameter group
22-3*, No Flow Power Tuning, or 22-20 Low Power Auto Set-up)
in order to use Dry Pump Detection.
NOTE
Do not set 14-20 Reset Mode, to [13] Infinite auto reset, when
22-26 Dry Pump Function is set to [2] Alarm. Doing so will
cause the drive to continuously cycle between running and
stopping when a Dry Pump condition is detected.
NOTE
If the drive is equipped with a constant speed bypass with an
automatic bypass function that starts the bypass if the drive
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:
10 s [0 - 600 s] Defines for how long the Dry Pump condition
*
3.20.2 22-3* No-Flow Power Tuning
Tuning Sequence, if not choosing Auto Set Up in 22-20 Low
Power Auto Set-up:
1. Close the main valve to stop flow
2. Run with motor until the system has reached
normal operating temperature
144
®
VLT
Function:
The drive will continue to run, but activate a
Dry pump warning [W93]. A drive digital
output or a serial communication bus can
communicate a warning to other equipment.
The drive will stop running and activate a Dry
pump alarm [A93]. A drive digital output or a
serial communication bus can communicate
an alarm to other equipment.
The drive will stop running and activate a Dry
pump alarm [A93]. A drive digital output or a
serial communication bus can communicate
an alarm to other equipment.
Function:
must be active before activating Warning or
Alarm
MG.11.CB.02 - VLT
HVAC Drive Programming Guide
3. Press Hand On button on the LCP and adjust speed
for approx. 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 call
16-10 Power [kW] or 16-11 Power [hp] in Main Menu.
Note the power read out
5. Change speed to approx. 50% of rated speed. Note
the exact speed
6. Read power consumption either by looking for
actual power in the data line in the LCP or call
16-10 Power [kW] or 16-11 Power [hp] in Main Menu.
Note the power read
7. Program the speeds used in 22-32 Low Speed [RPM],
22-33 Low Speed [Hz], 22-36 High Speed [RPM] and
22-37 High Speed [Hz]
8. Program the associated power values in 22-34 Low
Speed Power [kW], 22-35 Low Speed Power [HP],
22-38 High Speed Power [kW] and 22-39 High Speed
Power [HP]
9. Switch back by means of Auto On or Off
NOTE
Set 1-03 Torque Characteristics before tuning takes place.
22-30 No-Flow Power
Range:
0.00 kW [0.00 - 0.00
*
kW]
22-31 Power Correction Factor
Range:
100 % [1 - 400
*
%]
22-32 Low Speed [RPM]
Range:
Size related
*
22-33 Low Speed [Hz]
Range:
Size related
*
22-34 Low Speed Power [kW]
Range:
Size related
*
®
is a registered Danfoss trademark
Function:
Read out of calculated No Flow power at
actual speed. If power drops to the
display value the frequency converter will
consider the condition as a No Flow
situation.
Function:
Make corrections to the calculated power at
22-30 No-Flow Power.
If No Flow is detected, when it should not be
detected, the setting should be decreased.
However, if No Flow is not detected, when it
should be detected, the setting should be
increased to above 100%.
Function:
[0 - par. 22-36 RPM]
Function:
[0.0 - par. 22-37 Hz]
Function:
[0.00 - 0.00 kW]