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 frequency converter enters Sleep Mode and
stops when a No Flow condition is detected.
See parameter group 22-4* Sleep Mode for
programming options for Sleep Mode.
[2] Warning The frequency converter continues to run, but
activates a No-Flow Warning [W92]. A digital
output or a serial communication bus can
communicate a warning to other equipment.
[3] Alarm The frequency converter stops running and
activates a No-Flow Alarm [A 92]. A frequency
converter digital output or a serial communi-
cation bus can communicate an alarm to other
equipment.
NOTICE
Do not set 14-20 Reset Mode, to [13] Infinite auto reset,
when parameter 22-23 No-Flow Function is set to [3]
Alarm. Doing so causes the frequency converter to
continuously cycle between running and stopping when
a No Flow condition is detected.
NOTICE
If the frequency converter is equipped with a constant
speed bypass with an automatic bypass function that
starts the bypass if the frequency converter 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 is reset.
22-26 Dry Pump Function
Select desired action for dry pump operation.
Option: Function:
[0] Off
[1] Warning The frequency converter continues to run, but
activates a Dry pump warning [W93]. 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 [A93]. A frequency
converter digital output or a serial communi-
22-26 Dry Pump Function
Select desired action for dry pump operation.
Option: Function:
cation bus can communicate an alarm to other
equipment.
[3] Manual
Reset Alarm
The frequency converter stops running and
activates a Dry pump alarm [A93]. A frequency
converter digital output or a serial communi-
cation bus can communicate an alarm to other
equipment.
NOTICE
Low Power Detection must be Enabled
(parameter 22-21 Low Power Detection) and commis-
sioned (using either parameter group 22-3* No-flow
Power Tuning No Flow Power Tuning, or
parameter 22-20 Low Power Auto Set-up) to use Dry Pump
Detection.
NOTICE
Do not set 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
If the frequency converter is equipped with a constant
speed bypass with an automatic bypass function that
starts the bypass if the frequency converter 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.
The frequency converter waits for the No-Flow
Delay time (parameter 22-24 No-Flow Delay) to
expire before the timer for the Dry Pump Delay
starts.
22-30 No-Flow Power
Range: Function:
0 kW* [0 - 0 kW] Read out of calculated No Flow power at
actual speed. If power drops to the display
value, the frequency converter considers the
condition as a No Flow situation.
How to programme the freque... VLT AQUA Drive FC 202 Operation Instructions
104 MG20P402 - Rev. 2013-12-16
55
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