Parameter Description of function
5-54 Pulse Filter Time Constant #29 (Pulse
term. 29), 5-59 Pulse Filter Time Constant #33
(Pulse term. 33), 6-16 Terminal 53 Filter Time
Constant (Analog term 53), 6-26 Terminal 54
Filter Time Constant (Analog term. 54)
If there are oscillations of the current/voltage feedback signal, these can be dampened by
means of a low-pass filter. This time constant represents the speed limit of the ripples
occurring on the feedback signal.
Example: If the low-pass filter has been set to 0.1s, the limit speed will be 10 RAD/s (the
reciprocal of 0.1 s), corresponding to (10/(2 x π)) = 1.6 Hz. This means that all currents/
voltages that vary by more than 1.6 oscillations per second will be damped by the filter.
The control will only be carried out on a feedback signal that varies by a frequency
(speed) of less than 1.6 Hz.
The low-pass filter improves steady state performance but selecting a too large filter time
will deteriorate the dynamic performance of the Process PID Control.
Table 3.8 Relevant Parameters for Process Control
Function Parameter Setting
Initialise the frequency converter
14-22 Operation
Mode
[2] Initialisation - make a power cycling - press reset
1) Set motor parameters:
Set the motor parameters according to name plate
data
1-2* As stated on motor name plate
Perform a full Automation Motor Adaptation
1-29 Automatic
Motor
Adaptation
(AMA)
[1] Enable complete AMA
2) Check that motor is running in the right direction.
When motor is connected to frequency converter with straight forward phase order as U - U; V- V; W - W motor shaft usually turns
clockwise seen into shaft end.
Press [Hand On” ]. Check shaft direction by
applying a manual reference.
If motor turns opposite of required direction:
1.
Change motor direction in 4-10 Motor Speed
Direction
2. Turn off mains - wait for DC link to discharge -
switch two of the motor phases
4-10 Motor
Speed Direction
Select correct motor shaft direction
Set configuration mode 1-00 Configu-
ration Mode
[3] Process
Set Local Mode Configuration 1-05 Local
Mode Configu-
ration
[0] Speed Open Loop
3) Set reference configuration, ie. the range for reference handling. Set scaling of analog input in parameter 6-xx
Set reference/feedback units
Set min. reference (10 °C)
Set max. reference (80 °C)
If set value is determined from a preset value
(array parameter), set other reference sources to
No Function
3-01 Reference/
Feedback Unit
3-02 Minimum
Reference
3-03 Maximum
Reference
3-10 Preset
Reference
[60] °C Unit shown on display
10 °C
80 °C
[0] 35%
Ref
=
Par
. 3 − 10
(
0
)
100
×
((
Par
. 3 − 03
)
−
(
par
. 3 − 02
))
= 24, 5°
C
3-14 Preset Relative Reference to 3-18 Relative Scaling Reference
Resource [0] = No Function
4) Adjust limits for the frequency converter:
Set ramp times to an appropriate value as 20 s 3-41 Ramp 1
Ramp Up Time
3-42 Ramp 1
Ramp Down
Time
20 s
20 s
Introduction
VLT
®
AutomationDrive FC 300 Design Guide, 0.25-75 kW
MG33BE02 - VLT
®
is a registered Danfoss trademark 35
3
3
http://www.RSPSupply.com/p-21462-Danfoss-131B8966-VLT-Automation-VT-Drive-VFD-FC301-230V-5-HP.aspx
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