and
- Pump running at maximum speed or maximum reference open loop, whichever is lowest.
The signal must be active for a set time (par. 22-27
Dry Pump Delay
) before selected the action takes place.
Possible Actions to select (par. 22-26
Dry Pump Function
):
- Warning
- Alarm
No Flow Detection must be enabled (par. 22-23
No-Flow Function
) 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 (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
.
NB!
Auto Set Up must be done when the system has reached normal operating temperature!
NB!
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
Configuration Mode
.
NB!
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]
.
VLT
®
HVAC Drive Programming Guide 3 Parameter Description
MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
203
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