Operating instructions

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 (par. 4-13 Motor
Speed High Limit [RPM], par. 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 frequency converter must be set for
Open Loop (par. 1-00 Configuration Mode).
Note that it is important also to set
par. 1-03 Torque Characteristics.
NOTE
Auto Set Up must be done when the system has
reached normal operating temperature!
NOTE
It is important that the par. 4-13 Motor Speed High Limit
[RPM] or par. 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 Contoller as settings will be reset when
changing from Closed to Open Loop in par. 1-00 Config-
uration Mode.
NOTE
Carry out the tuning with the same settings in
par. 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 group 22-3* for proper
operation!
22-22 Low Speed Detection
Option: Function:
[0] * Disabled
[1] Enabled Select Enabled for detecting when the motor
operates with a speed as set in par. 4-11 Motor
Speed Low Limit [RPM] or par. 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:
[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 communi-
cate 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.
NOTE
Do not set par. 14-20 Reset Mode, to [13] Infinite auto
reset, when par. 22-23 No-Flow Functionis set to [3]
Alarm. Doing so will cause the drive to continuously
cycle between running and stopping when a No Flow
condition is detected.
NOTE
If the drive is equipped with a constant speed bypass
with an automatic bypass function that starts the bypass
if the 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.
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.
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG.11.CA.02 - VLT
®
is a registered Danfoss trademark 141
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