Danfoss VLT AutomationDrive FC 300 Programming Manual page 42

Parameter Descriptions
1-64 Resonance Dampening
Range: Function:
100 % [0 - 500 Enter the resonance dampening value. Set
*
%] 1-64 Resonance Dampening and
1-65 Resonance Dampening Time Constant to
help eliminate high-frequency resonance
problems. To reduce resonance oscillation,
increase the value of 1-64 Resonance
Dampening.
1-65 Resonance Dampening Time Constant
Range: Function:
5 ms [5 - 50 ms] Set 1-64 Resonance Dampening and
*
1-65 Resonance Dampening Time Constant to
help eliminate high-frequency resonance
problems. Enter the time constant that
provides the best dampening.
1-66 Min. Current at Low Speed
Range: Function:
100 [Application Enter the minimum motor current at low
% dependant] speed, see 1-53 Model Shift Frequency.
*
Increasing this current improves motor
torque at low speed.
1-66 Min. Current at Low Speed is enabled
when 1-00 Configuration Mode = Speed open
loop [0] only. The frequency converter runs
with constant current through motor for
speeds below 10Hz.
For speeds above 10Hz, the motor flux
model in the frequency converter controls
the motor. 4-16 Torque Limit Motor Mode
and / or 4-17 Torque Limit Generator Mode
automatically adjust 1-66 Min. Current at
Low Speed. The parameter with the highest
value adjusts 1-66 Min. Current at Low Speed.
The current setting in 1-66 Min. Current at
Low Speed is composed of the torque
generating current and the magnetizing
current.
Example: Set 4-16 Torque Limit Motor Mode
to 100% and set 4-17 Torque Limit Generator
Mode to 60%. 1-66 Min. Current at Low Speed
automatically adjusts to about 127%,
depending on the motor size.
FC 302 only.
1-67 Load Type
Option: Function:
[0] Passive load For conveyers, fan and pump applications.
*
[1] Active load For hoisting applications, used in slip compen-
sation at low speed. When Active Load [1] is
selected, set 1-66 Min. Current at Low Speed to a
level which corresponds to maximum torque.
FC 302 only.
FC 300 Programming Guide
1-68 Minimum Inertia
Range:
Application
dependent
This parameter cannot be adjusted while motor is running.
1-69 Maximum Inertia
Range:
Application
dependent
This parameter cannot be adjusted while motor is running.
3.3.7 1-7* Start Adjustments
1-71 Start Delay
Range:
0.0 s
1-72 Start Function
Option:
[0]
[1]
[2]
*
[3]
®
MG.33.MB.02 - VLT is a registered Danfoss trademark
Function:
[Application Needed for average inertia
dependant] calculation. Enter the minimum
*
moment of inertia of the
mechanical system. 1-68 Minimum
Inertia and 1-69 Maximum Inertia
are used for pre-adjustment of the
Proportional Gain in the speed
control, see 30-83 Speed PID Propor-
tional Gain.
FC 302 only.
Function:
[Application Active in Flux Open Loop only.
dependant] Used to compute the
*
acceleration torque at low
speed. Used in the torque limit
controller.
FC 302 only.
Function:
[0.0 - 25.5 s] This parameter refers to the start function
*
selected in 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 1-71 Start Delay.
DC Hold/ Energizes motor with a DC holding current
delay time (2-00 DC Hold Current) during the start delay
time.
DC Brake/ Energizes motor with a DC braking current
delay time (2-01 DC Brake Current) during the start delay
time.
Coast/delay Motor coasted during the start delay time
time (inverter off).
Start speed
Only possible with VVC
cw
Connect the function described in 1-74 Start
Speed [RPM] and 1-76 Start Current in the start
delay time.
Regardless of the value applied by the
reference signal, the output speed applies the
setting of the start speed in 1-74 Start Speed
3
plus
.
41
3