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 1-00 Configuration
Mode.
NOTE
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* 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 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:
[0] * Off
[1] Sleep Mode The frequency converter 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 frequency converter 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 frequency converter will stop running and
activate
a No-Flow Alarm [A 92]. A frequency
converter digital output or a serial communi-
cation bus can communicate an alarm to
other equipment.
NOTE
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 frequency converter to continuously cycle
between running and stopping when a No Flow condition
is detected.
NOTE
If
the frequency converter is equipped with a constant
speed bypass with an automatic bypass function that starts
the bypass if the frequency converter 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.
22-26 Dry Pump Function
Select desired action for dry pump operation.
Option: Function:
[0] * Off
[1] Warning The frequency converter will continue to run, but
activate
a Dry pump warning [W93]. A frequency
converter digital output or a serial communi-
cation bus can communicate a warning to other
equipment.
[2] Alarm The frequency converter will stop running and
activate
a Dry pump alarm [A93]. A frequency
converter digital output or a serial communi-
cation bus can communicate an alarm to other
equipment.
NOTE
Low
Power Detection must be Enabled (22-21 Low Power
Detection) and commissioned (using either parameter
group 22-3*, No Flow Power Tuning, or 22-20 Low Power
Auto Set-up) in order to use Dry Pump Detection.
NOTE
Do
not set 14-20 Reset Mode, to [13] Infinite auto reset,
when 22-26 Dry Pump Function is set to [2] Alarm. Doing so
will cause the frequency converter to continuously cycle
between running and stopping when a Dry Pump
condition is detected.
Parameter Description
VLT
®
Refrigeration Drive Programming Guide
130 MG16H102 - VLT
®
is a registered Danfoss trademark
33
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