Danfoss VLT AQUA Drive FC 202 Programming Manual page 182

Parameter Description
22-22 Low Speed Detection
Option:
3 3
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
180
VLT
Function:
minimum as required for the normal low speed
detection.
When this option is selected, the frequency
converter creates a pressure pulse (boost of the
pressure) when the feedback is within the
range defined in parameter 7-39 On Reference
Bandwidth for a time period defined in
parameter 22-40 Minimum Run Time or longer.
Parameter 22-45 Setpoint Boost adjusts the
height of the pulses.
Parameter 22-46 Maximum Boost Time defines
the maximum length of the pulse.
Refer to Cascade Controller Options MCO
101/102 Operating Instructions for more
information about the cascade controller.
NOTICE
Ensure that the system can withstand
the boost pressure.
Function:
NOTICE
Do not set parameter 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
Disable the automatic bypass function
of the bypass if the frequency converter
is equipped with a constant-speed
bypass with an automatic bypass
function starting the bypass if the
frequency converter experiences a
persistent alarm condition, and [3]
Alarm is selected as the no-flow
function.
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.
The frequency converter continues to run, but
activates a no-flow warning (warning 92,
NoFlow). A digital output or a serial communi-
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AQUA Drive FC 202
22-23 No-Flow Function
Common actions for low-power detection and low-speed
detection (individual selections not possible).
Option:
[3] Trip
[4] Stop and
Trip
22-24 No-Flow Delay
Range:
10 s [1 - 600 s] Set the time that low power/low speed must
*
22-26 Dry Pump Function
Select the action for dry-pump operation.
Option:
[0] Off
*
Function:
cation bus can communicate a warning to
other equipment.
The frequency converter stops running and
activates a no-flow alarm (alarm 92, NoFlow). A
frequency converter digital output or a serial
communication bus can communicate an
alarm to other equipment.
Function:
stay detected to activate signal for actions. If
detection disappears before the timer runs
out, the timer is reset.
Function:
MG20OB02