Danfoss VLT FC 102 Programming Manual page 202

Parameter Descriptions
The condition for dry-pump signal:
•
Power consumption below no-flow level.
and
•
Pump running at maximum speed or maximum reference open loop, whichever is lowest.
3 3
The signal must be active for a set time (parameter 22-27 Dry Pump Delay) before the selected action takes place.
Possible actions to select (parameter 22-26 Dry Pump Function):
•
Warning
•
Alarm
Enable and commission no-flow detection in parameter 22-23 No-Flow Function and 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:
[0] Off
*
[1] Enabled
200
®
VLT HVAC Drive FC 102
Function:
NOTICE
Do the auto set-up when the
system has reached normal
operating temperature.
NOTICE
It is important that
parameter 4-13 Motor Speed
High Limit [RPM] or
parameter 4-14 Motor Speed
High Limit [Hz] is set to the
maximum 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 loop to
open loop in
parameter 1-00 Configuration
Mode.
NOTICE
Carry out the tuning with the
same settings in
parameter 1-03 Torque Charac-
teristics as for operation after
the tuning.
An auto set-up sequence is
activated, automatically setting the
speed to approximately 50% and
85% of nominal motor speed
(parameter 4-13 Motor Speed High
Limit [RPM], parameter 4-14 Motor
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22-20 Low Power Auto Set-up
Start of auto set-up of power data for no-flow power tuning.
Option: Function:
Speed High Limit [Hz]). At those 2
speeds, the power consumption is
automatically measured and stored.
Before enabling auto set-up:
22-21 Low Power Detection
Option: Function:
[0] Disabled
*
[1] Enabled To set the parameters in parameter
group 22-3* No-Flow Power Tuning
for proper operation, carry out the
low-power detection commis-
sioning.
22-22 Low Speed Detection
Option: Function:
[0] Disabled
*
[1] Enabled Detects when the motor operates
with a speed as set in
parameter 4-11 Motor Speed Low
Limit [RPM] or parameter 4-12 Motor
Speed Low Limit [Hz].
1. Close valves to create a
no-flow condition.
2. Set the frequency
converter to open loop
(parameter 1-00 Configu-
ration Mode).
It is important also to set
parameter 1-03 Torque
Characteristics.
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