Danfoss FC 300 Programming Manual page 42

Parameter Descriptions
3.3.7 1-7* Start Adjustments
1-71 Start Delay
Range:
0.0 s [0.0 - 10.0 s] This parameter refers to the start function
*
3 3
1-72 Start Function
Option:
[0] DC Hold/
delay time
[1] DC Brake/
delay time
[2] Coast/delay
time
*
[3] Start speed
cw
[4] Horizontal
operation
[5] VVC+/Flux
clockwise
42
FC 300 Programming Guide
Function:
selected in par. 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 par. 1-71 Start Delay.
Energizes motor with a DC holding current
(par. 2-00 DC Hold Current) during the start
delay time.
Energizes motor with a DC braking current
(par. 2-01 DC Brake Current) during the start
delay time.
Motor coasted during the start delay time
(inverter off).
Only possible with VVC+.
Connect the function described in
par. 1-74 Start Speed [RPM] and par. 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 par. 1-74 Start
Speed [RPM] or par. 1-75 Start Speed [Hz] and the
output current corresponds to the setting of
the start current in par. 1-76 Start Current. This
function is typically used in hoisting applica-
tions without counterweight and especially in
applications with a Cone-motor, where the start
is clockwise, followed by rotation in the
reference direction.
Only possible with VVC+.
For obtaining the function described in
par. 1-74 Start Speed [RPM] and par. 1-76 Start
Current during the start delay time. The motor
rotates in the reference direction. If the
reference signal equals zero (0), par. 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
par. 1-76 Start Current.
for the function described in par. 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
par. 1-74 Start Speed [RPM].Start speed/current
plus
clockwise [3] and VVC /Flux clockwise [5] are
MG.33.M9.02 - VLT
1-72 Start Function
Option: Function:
typically used in hoisting applications. Start
speed/current in reference direction [4] is particu-
larly used in applications with counterweight
and horizontal movement.
[6] Hoist Mech. For utilizing mechanical brake control
Brake Rel functions, par. 2-24 Stop Delay to par. 2-28 Gain
Boost Factor. This parameter is only active when
par. 1-01 Motor Control Principle is set to [3] Flux
w/ motor feedback (FC 302 only).
[7] VVC+/Flux
counter-cw
1-73 Flying Start
Option:
[0] Disabled
*
[1] Enabled
[2] Enabled Always
[3] Enabled Ref. Dir.
[4] Enab. Always
Ref. Dir.
This parameter cannot be adjusted while motor is running.
NOTE
This function is not recommended for hoisting applica-
tions.
For power levels above 55kW, flux mode must be used
to achieve the best performance.
1-74 Start Speed [RPM]
Range:
Application [0 - 600
dependent RPM]
*
®
is a registered Danfoss trademark
Function:
This function makes it possible to catch a
motor which is spinning freely due to a
mains drop-out.
No function
Enables the frequency converter to "catch"
and control a spinning motor.
When par. 1-73 Flying Start is enabled,
par. 1-71 Start Delay and par. 1-72 Start
Function have no function.
Function:
Set a motor start speed. After the start
signal, the output speed leaps to set
value. Set the start function in
par. 1-72 Start Function to [3], [4] or [5],
and set a start delay time in
par. 1-71 Start Delay.