-
Warning
-
Alarm
No Flow Detection must be enabled (
and commissioned (parameter group 22-3*,
No 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 (
,
4-14 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 (
Note that it is important also to set
.
NOTE
Auto Set Up must be done when the system has reached
normal operating temperature!
NOTE
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 Contoller as settings will be reset when
changing from Closed to Open Loop in
NOTE
Carry out the tuning with the same settings in
, 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
or
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
communicate 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
, to [13] Infinite auto reset, when
is 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.CB.02 - VLT
®
is a registered Danfoss trademark
143
3
3
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