Danfoss VLT AQUA Drive FC 202 Programming Manual page 154

Parameter Description
In a dry pump detection setup, select [0] Off in parameter
22-23 No-Flow Function. Otherwise make sure that the
options in that parameter do not prevent the dry pump
detection.
22-20 Low Power Auto Set-up
3 3
Start of auto set-up of power data for No-Flow Power tuning.
Option:
[0] Off
[1] Enabled When set for Enabled, an auto set-up sequence is
activated, automatically setting speed to approx. 50
and 85% of rated motor speed
(parameter 4-13 Motor Speed High Limit [RPM],
parameter 4-14 Motor Speed High Limit [Hz]). At
those 2 speeds, the power consumption is automat-
ically measured and stored.
Before enabling Auto Set-Up:
NOTICE
Auto Set-up must be done when the system has reached
normal operating temperature!
NOTICE
It is important that the parameter 4-13 Motor Speed High
Limit [RPM] or parameter 4-14 Motor Speed High Limit [Hz]
is set to the max. operational speed of the motor!
It is important to do the Auto Set-up before configuring
the integrated PI Controller as settings are reset when
changing from closed to open loop in
parameter 1-00 Configuration Mode.
NOTICE
Carry out the tuning with the same settings in
1-03 Torque Characteristics, as for operation after the
tuning.
22-21 Low Power Detection
Option:
[0] Disabled
[1] Enabled The Low Power Detection commissioning must be
22-22 Low Speed Detection
Option:
[0] Disabled
152
Function:
1. Close valve(s) to create a no flow
condition
2. The frequency converter must be set for
Open Loop (parameter 1-00 Configuration
Mode).
Note that it is important also to set
1-03 Torque Characteristics.
Function:
carried out to set the parameters in parameter
group 22-3* No-Flow Power Tuning for proper
operation.
Function:
Danfoss A/S © Rev. 2014-01-21 All rights reserved.
Programming Guide
22-22 Low Speed Detection
Option:
[1] Enabled Detects when the motor operates with a speed as
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 The frequency converter enters sleep mode and
[2] Warning
[3] Alarm
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:
10 s
*
Function:
set in parameter 4-11 Motor Speed Low Limit [RPM]
or parameter 4-12 Motor Speed Low Limit [Hz].
Function:
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 [W92]. A digital
output or a serial communication bus can
communicate a warning to other equipment.
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.
Function:
[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.
MG20O702