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.
This parameter is available for
the 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] 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+.
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
operation
Only possible with VVC+.
For obtaining the function described in
1-74 Start Speed [RPM] and 1-76 Start Current
during the start delay time. The motor rotates
1-72 Start Function
Option: Function:
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] Hst. mech.
brake rel
For utilizing mechanical brake control
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
1-73 Flying Start
Option: Function:
This function makes it possible to catch a
motor that is spinning freely due to a line
drop-out.
[0]
*
Disabled No function
[1] Enabled Enables the adjustable frequency drive to
“catch” and control a spinning motor.
When 1-73 Flying Start is enabled,
1-71 Start Delay and 1-72 Start Function
have no function.
[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 applications.
For power levels above 75 hp [55 kW], flux mode must be
used to achieve the best performance.
Parameter Descriptions FC 300 Programming Guide
MG.33.MA.22 - VLT
®
is a registered Danfoss trademark 3-21
3
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