Start Adjustments; Load Type; Minimum Inertia; Start Function - Danfoss VLT AutomationDrive Programming Manual

Parameter Descriptions

1-67 Load Type

Option: Function:
[0] Passive load For conveyers, fan and pump applications.
*
[1] Active load For hoisting applications, used in slip
compensation 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.

1-68 Minimum Inertia

Range:
Application [Application
dependent dependant]
*
This parameter cannot be adjusted while motor is running.
1-69 Maximum Inertia
Range:
Application [Application
dependent dependant]
*
This parameter cannot be adjusted while motor is running.

3.3.7 1-7* Start Adjustments

1-71 Start Delay
Range: Function:
0.0 s [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.

1-72 Start Function

Option: Function:
Select the start function during start delay.
This parameter is linked to 1-71 Start Delay.
[0] DC Hold/ Energizes motor with a DC holding current
delay time (2-00 DC Hold Current) during the start delay
time.
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FC 300 Programming Guide
Function:
Needed for average inertia
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
Proportional Gain.
FC 302 only.
Function:
Active in flux open-loop only.
Used to compute the
acceleration torque at low
speed. Used in the torque limit
controller.
FC 302 only.
®
MG33MD22 - VLT is a registered Danfoss trademark
1-72 Start Function
Option: Function:
[1] DC Brake/ Energizes motor with a DC braking current
delay time (2-01 DC Brake Current) during the start delay
time.
[2] Coast/delay Motor coasted during the start delay time
time (inverter off).
*
[3] 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 [RPM] or 1-75 Start Speed [Hz] and the
output current corresponds to the setting of
the start current in 1-76 Start Current. This
function is typically used in hoisting
applications without counterweight, and
especially in applications with a cone motor
where the start is clockwise, followed by
rotation in the reference direction.
[4] Horizontal
Only possible with VVC
operation
For obtaining the function described in
1-74 Start Speed [RPM] and 1-76 Start Current
during the start delay time. The motor
rotates in the reference direction. If the
reference signal equals zero (0), 1-74 Start
Speed [RPM] is ignored and the output speed
equals zero (0). The output current
corresponds to the setting of the start
current in 1-76 Start Current.
[5] VVC+/Flux for the function described in 1-74 Start Speed
clockwise [RPM] only. The start current is calculated
automatically. This function uses the start
speed in the start delay time only. Regardless
of the value set by the reference signal, the
output speed equals the setting of the start
speed in 1-74 Start Speed [RPM]. Start speed/
current clockwise [3] and VVC
[5] are typically used in hoisting applications.
Start speed/current in reference direction [4] is
particularly used in applications with counter-
weight and horizontal movement.
[6] Hoist Mech. For utilizing mechanical brake control
Brake Rel functions, 2-24 Stop Delay to 2-28 Gain Boost
Factor. This parameter is only active when
1-01 Motor Control Principle is set to [3] Flux
w/ motor feedback (FC 302 only).
[7] VVC+/Flux
counter-cw
3
plus .
plus .
plus /Flux clockwise
3-21
3