Danfoss VLT HVAC Drive FC 102, Programming Manual, Page: 165 / 250

22-26 Dry Pump Function
Select desired action for dry-pump operation.
Option: Function:
[0]
*
Off
[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 bypass’s 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] Alarm 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] Man.
Reset
Alarm 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.
22-26 Dry Pump Function
Select desired action for dry-pump operation.
Option: Function:
[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 (
22-24 No-Flow Delay ) to expire
before the timer for the dry-pump delay starts.
3.20.2 22-3* No-flow Power Tuning
If not selecting Auto Set Up in parameter 22-20 Low Power
Auto Set-up , the tuning sequence is:
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 call
4a Parameter 16-10 Power [kW]
or
4b Parameter 16-11 Power [hp] in Main
Menu.
Note the power readout.
5. Change speed to approximately 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
6a Parameter 16-10 Power [kW]
or
6b Parameter 16-11 Power [hp] in Main
Menu.
Note the power readout.
7. Programme 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] .
8. Programme the associated power values in:
Parameter Descriptions Programming Guide
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