Danfoss VLT AutomationDrive Programming Manual Download

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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:

Function:

Application
dependent

[Application
dependant]

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.

This parameter cannot be adjusted while motor is running.

1-69 Maximum Inertia

Range:

Function:

Application
dependent

[Application
dependant]

Active in flux open-loop only.
Used to compute the
acceleration torque at low
speed. Used in the torque limit
controller.
FC 302 only.

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/
delay time

Energizes motor with a DC holding current
(

2-00 DC Hold Current

) during the start delay

time.

1-72 Start Function

Option:

Function:

[1]

DC Brake/
delay time

Energizes motor with a DC braking current
(

2-01 DC Brake Current

) during the start delay

time.

[2]

Coast/delay
time

Motor coasted during the start delay time
(inverter off).

[3]

Start speed
cw

Only possible with VVC

plus

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]

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
operation

Only possible with VVC

plus

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
clockwise

for the function described in

1-74 Start Speed

[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

plus

/Flux clockwise

[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]