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NOTE
Do not set
, to [13] Infinite auto reset,
when
is set to [3] Alarm. Doing so
will cause the drive to continuously cycle between running
and stopping when a No Flow 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 [3] Alarm
is selected as the No-Flow Function.
22-24 No-Flow Delay
Range:
Function:
10 s
*
[1 - 600 s] Set the time Low Power/Low Speed must stay
detected to activate signal for actions. If
detection disappears before run out of the
timer, the timer will be reset.
22-26 Dry Pump Function
Select desired action for dry pump operation.
Option:
Function:
[0]
*
Off
[1]
Warning
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.
[2]
Alarm
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.
[3]
Man. Reset
Alarm
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.
NOTE
Low Power Detection
must be Enabled (
) and commissioned (using either parameter
group 22-3*,
No Flow Power Tuning
, or
) in order to use Dry Pump Detection.
NOTE
Do not set
, to [13] Infinite auto reset,
when
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:
Function:
10 s
*
[0 - 600 s] Defines for how long the Dry Pump condition
must be active before activating Warning or
Alarm
3.20.2 22-3* No-Flow Power Tuning
Tuning Sequence, if not choosing
Auto Set Up
in
:
1.
Close the main valve to stop flow
2.
Run with motor until the system has reached
normal operating temperature
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
or
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
or
in Main
Menu. Note the power read
7.
Program the speeds used in
,
and
8.
Program the associated power values in
,
,
and
9.
Switch back by means of
Auto On
or
Off
NOTE
Set
before tuning takes place.
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG.11.CC.02 - VLT
®
is a registered Danfoss trademark
149
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