Danfoss VLT Refrigeration Drive FC 103 Programming Manual page 150

Parameter Description
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
3 3
22-21 Low Power Detection
Option:
[0] Disabled
*
[1] Enabled To set the parameters in parameter group 22-3*
22-22 Low Speed Detection
Option:
[0] Disabled
*
[1] Enabled Detects when the motor operates with a speed
148
VLT
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, automat-
ically setting speed to approximately 50% and
85% of nominal motor speed
(parameter 4-13 Motor Speed High Limit [RPM],
parameter 4-14 Motor Speed High Limit [Hz]). At
those 2 speeds, the power consumption is
automatically measured and stored.
Before enabling auto set-up:
1. Close valve(s) to create a no-flow
condition.
2. Set the frequency converter to open
loop (parameter 1-00 Configuration Mode).
It is important also to set
parameter 1-03 Torque Characteristics.
Function:
No-Flow Power Tuning for proper operation, carry
out the low-power detection commissioning.
Function:
as set in parameter 4-11 Motor Speed Low Limit
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®
Refrigeration Drive FC 103
22-22 Low Speed Detection
Option:
22-23 No-Flow Function
Common actions for low-power detection and low-speed
detection (individual selections not possible).
Option:
[0] Off
*
[1] Sleep
Mode
[2] Warning
[3] Alarm
22-24 No-Flow Delay
Range:
10 s [1 - 600 s] Set the time that low power/low speed must
*
Function:
[RPM] or parameter 4-12 Motor Speed Low Limit
[Hz].
Function:
NOTICE
Do not set parameter 14-20 Reset Mode,
to [13] Infinite auto reset, when
parameter 22-23 No-Flow Function is set
to [3] Alarm. Doing so causes the
frequency converter to continuously
cycle between running and stopping
when a no-flow condition is detected.
NOTICE
Disable the automatic bypass function
of the bypass if the frequency converter
is equipped with a constant-speed
bypass with an automatic bypass
function starting the bypass if the
frequency converter experiences a
persistent alarm condition, and [3]
Alarm is selected as the no-flow
function.
The frequency converter enters sleep mode
and stops when a no-flow condition is
detected. See parameter group 22-4* Sleep
Mode for programming options for sleep
mode.
The frequency converter continues to run, but
activates a no-flow warning (warning 92,
NoFlow). A digital output or a serial communi-
cation bus can communicate a warning to
other equipment.
The frequency converter stops running and
activates a no-flow alarm (alarm 92, NoFlow). A
frequency converter digital output or a serial
communication bus can communicate an
alarm to other equipment.
Function:
stay detected to activate signal for actions. If
detection disappears before the timer runs
out, the timer is reset.
MG16H202