22-23 No-Flow Function
Common actions for Low Power Detection and Low Speed Detection (Individual selections not possible).
Option:
Function:
[0] *
Off
[1]
Sleep Mode
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.
[2]
Warning
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.
[3]
Alarm
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.
Do not set par. 14-20
Reset Mode
, to [13] Infinite
auto reset, when par. 22-23
is set
to [3] Alarm. Doing so will cause the drive to contin-
uously cycle between running and stopping when a
No Flow condition is detected.
If the drive is equipped with a constant speed bypass
with an automatic bypass function that starts the by-
pass if the drive experiences a persistent alarm con-
dition, be sure to disable the bypass’s automatic by-
pass 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.
Low
Power
Detection
must
be
Enabled
) and commissioned
(using either parameter group 22-3*,
No Flow Power
Tuning
, or par. 22-20
Low Power Auto Set-up
) in or-
der to use Dry Pump Detection.
Do not set par. 14-20
Reset Mode
, to [13] Infinite
auto reset, when par. 22-26
set to [2] Alarm. Doing so will cause the drive to con-
tinuously cycle between running and stopping when
a Dry Pump condition is detected.
If the drive is equipped with a constant speed bypass
with an automatic bypass function that starts the by-
pass if the drive experiences a persistent alarm con-
dition, be sure to disable the bypass’s automatic by-
pass function, if [2] Alarm or [3] Man. Reset Alarm is
selected as the Dry Pump Function.
22-40 Minimum Run Time
Range:
Function:
10 s*
[0 - 600 s]
Set the desired minimum running time for the motor after a start command (digital input or Bus)
before entering Sleep Mode.
6 How to Programme
VLT HVAC Drive High Power Operating In-
structions
128
MG.11.F3.02 - VLT
®
is a registered Danfoss trademark
6