Danfoss VLT AQUA Drive FC 200 Programming Manual page 151

Parameter Description
- Warning
- Alarm
No-Flow Detection must be enabled (22-23 No-Flow
Function) and commissioned (parameter group 22-3*, No-
Flow Power Tuning).
22-20 Low Power Auto Set-up
Start of auto set-up of power data for No-Flow Power tuning.
Option: Function:
[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 (4-13 Motor
Speed High Limit [RPM], 4-14 Motor Speed High Limit
[Hz]). At those two speeds, the power consumption
is automatically measured and stored.
Before enabling Auto Set-up:
1. Close valve(s) in order to create a no-flow
condition
2. The adjustable frequency drive must be
set for open-loop (1-00 Configuration
Mode).
Note that it is important also to set
1-03 Torque Characteristics.
NOTICE!
Auto set-up must be done when the system has reached
normal operating temperature!
NOTICE!
It is important that the 4-13 Motor Speed High Limit [RPM]
or 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 will be reset when
changing from Closed to Open-loop in 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: Function:
[0] Disabled
[1] Enabled If selecting Enabled, the Low Power Detection
commissioning must be carried out in order to set
the parameters in parameter group 22-3* No-Flow
Power Tuning for proper operation!
®
VLT AQUA Drive Programming Guide
[0] Disabled
[1] Enabled Select Enabled for detecting when the motor
[0] OFF
[1] Sleep Mode The adjustable frequency drive will enter Sleep
[2] Warning
[3] Alarm
NOTICE!
Do not set 14-20 Reset Mode to [13] Infinite auto reset
when 22-23 No-Flow Function is set to [3] Alarm. Doing so
will cause the adjustable frequency drive to continuously
cycle between running and stopping when a No-Flow
condition is detected.
NOTICE!
If the adjustable frequency drive is equipped with a
constant speed bypass with an automatic bypass function
that starts the bypass if the adjustable frequency drive
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.
10 s
®
MG20O622 - VLT is a registered Danfoss trademark
22-22 Low Speed Detection
Option: Function:
operates with a speed as set in 4-11 Motor Speed
Low Limit [RPM] or 4-12 Motor Speed Low Limit [Hz].
22-23 No-Flow Function
Common actions for Low Power Detection and Low Speed
Detection (Individual selections not possible).
Option: Function:
Mode and stop when a No-Flow condition is
detected. See parameter group 22-4* Sleep
mode for programming options for Sleep mode.
The adjustable frequency 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 adjustable frequency drive will stop running
and activate a No-Flow Alarm [A 92]. An
adjustable frequency drive digital output or a
serial communication bus can communicate an
alarm to other equipment.
22-24 No-Flow Delay
Range: Function:
[1 - 600 s] 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.
3 3
3-125