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VLT
®
HVAC Drive Instruction Manual
22-23 No-Flow Function
Common actions for Low Power Detection and Low Speed Detection (Individual selections not possible).
Option:
[0] *
OFF
[1]
Sleep Mode
[2]
Warning
[3]
Alarm
NOTE!
Do not set par. 14-20
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' automatic bypass function, if [3] Alarm is selected as the No-Flow Function.
22-24 No-Flow Delay
Range:
10 s*
[1 - 600 s]
22-26 Dry Pump Function
Select desired action for dry pump operation.
Option:
[0] *
OFF
[1]
Warning
[2]
Alarm
[3]
NOTE!
Low Power Detection
Flow Power Tuning
NOTE!
Do not set par. 14-20
cause the drive to continuously cycle between running and stopping when a dry pump condition is detected.
Function:
The drive will enter sleep mode and stop when a No Flow condition is detected. See parameter
group 22-4* for programming options for sleep mode.
The drive will continue to run, but activate a No-Flow Warning [W92]. A drive digital output or a
serial communication bus can communicate a warning to other equipment.
The drive will stop running and activate a No-Flow Alarm [A 92]. A drive digital output or a serial
communication bus can communicate an alarm to other equipment.
Reset Mode
to [13] Infinite auto reset when par. 22-23
Function:
Set the time. Low Power/Low Speed must remain detected to activate signal for actions. If detection
disappears before the timer runs out, the timer will be reset.
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.
Low Power Detection
must be Enabled (par. 22-21
Low Power Auto Set-up
, or par. 22-20
Reset Mode
, to [13] Infinite auto reset, when par. 22-26
MG.11.AB.22 - VLT
®
is a registered Danfoss trademark
7 How to Program the Adjustable Frequency
No-Flow Function
) and commissioned (using either parameter group 22-3*,
) in order to use Dry Pump Detection.
Dry Pump Function
is set to [3] Alarm. Doing so will cause
No
is set to [2] Alarm. Doing so will
Drive
7
7-43
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