Danfoss VLT AutomationDrive FC 301 Programming Manual page 69

Parameter Descriptions
1-66 Min. Current at Low Speed
Range: Function:
Example: Set parameter 4-16 Torque
Limit Motor Mode to 100% and set
parameter 4-17 Torque Limit
Generator Mode to 60%.
Parameter 1-66 Min. Current at Low
Speed automatically adjusts to
about 127%, depending on the
motor size.
1-67 Load Type
This parameter is valid for FC 302 only.
Option: Function:
[0] Passive load For conveyors, fan, and pump
*
applications.
[1] Active load For hoisting applications. This
option allows the frequency
converter to ramp up at 0 RPM.
When [1] Active Load is selected, set
parameter 1-66 Min. Current at Low
Speed to a level which corresponds
to maximum torque.
1-68 Motor Inertia
Range: Function:
0 kgm² [0.0000 - Enter the motor inertia to obtain an
*
10000.0000 improved torque readout and
kgm²] therefore a better estimate of the
mechanical torque on the shaft.
Available in flux control principle
only.
1-69 System Inertia
Range: Function:
NOTICE
Size [0000 -
related 10000.0000
*
Valid for FC 302 only.
kgm²]
This parameter cannot be
adjusted while motor is
running.
The system inertia and
parameter 7-08 Speed PID Feed
Forward Factor is used to calculate
acceleration feed forward for the
speed PID controller.
NOTICE
Valid for software version
48.3X only.
Automatic measurement of system
inertia and setting of this parameter
is activated by setting the
parameter to 0. System inertia is
M0013101
Programming Guide
1-69 System Inertia
Range:
3.2.10 1-7* Start Adjustments
1-70 Start Mode
Select the start-up mode. This is done to initialize the VVC
control core for previously free-running motor. Both selections
estimate the speed and angle. Active for PM and SynRM motors
+
in VVC
Option:
[0]
*
[1]
[2]
1-71 Start Delay
Range:
0 s
*
1-72 Start Function
Option:
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Function:
calculated after 1
with sufficient data and the
parameter is automatically set after
stop.
The function is only active when
parameter 1-01 Motor Control
Principle is set to [2] Flux Sensorless
or [3] Flux w/motor feedb.
Acceleration to at least model shift
frequency (parameter 1-53 Model
Shift Frequency) + 10 Hz and
decelerate to produce a result.
Measurement is possible in both
speed, position, or synchronization
mode.
only.
Function:
Rotor Estimates the electrical angle of the
Detection rotor and uses this as a starting
point. Standard selection for VLT
AutomationDrive applications.
Parking The parking function applies DC
current across the stator winding
and rotates the rotor to electrical 0
position (typically selected for HVAC
applications). Parking current and
time are configured in
parameter 2-06 Parking Current and
parameter 2-07 Parking Time.
Rotor Det. w/
Parking
Function:
[0 - 25.5 s] This parameter refers to the start
function selected in
parameter 1-72 Start Function.
Enter the time delay required
before commencing acceleration.
Function:
Select the start function during
start delay. This parameter is linked
to parameter 1-71 Start Delay.
st
running cycle
3 3
+
®
67