Danfoss FC 300 Design Manual page 168

FC 300 Design Guide
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 or par. 1-75 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 applications without
counterweight and especially in applications with a
cone motor, where the start is clockwise, followed by
rotation in the reference direction. Select Horizontal
operation [4] to obtain the function described in
par. 1-74 and par. 1-76 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.
Select VVC+/Flux clockwise [5] for the function
described in par. 1-74 only (Start speed in the
start delay time). 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/current clockwise [3] and VVCplus/Flux
clockwise [5] are typically used in hoisting
applications. Start speed/current in reference
direction [4] is particularly used in applications with
counterweight and horizontal movement.
1-73 Flying Start [RPM]
Option:
*
Off (DISABLED)
On (ENABLED)
Function:
This function makes it possible to catch a motor
which is spinning freely due to a mains drop-out.
Select Disable [0] if this function is not required.
Select Enable [1] to enable the frequency converter
to "catch" and control a spinning motor.
When par. 1-73 is enabled par. 1-71 Start Delay
and 1-72 Start Function have no function.
NOTE
This function is not recommended for
hoisting applications.
default setting ( ) display text
*
168
How to Program
Set the motor start speed. After the start signal,
the motor output speed leaps to the set value.
This parameter can be used for hoist applications
(cone rotor motors). 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.
A reference signal must be present.
Set the motor start speed. After the start signal
the motor output speed leaps to the set value.
This parameter can be used for hoist applications
(cone rotor motors). 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.
A reference signal must be present.
Some motors, such as cone rotor motors, need
extra current/starting speed (boost) to disengage
the mechanical brake. Adjust par. 1-74 Start Speed
[0]
[RPM] and par. 1-76 to get this boost. Set the
[1]
required current value to disengage the mechanical
brake. Set par. 1-72 Start Function to [3] or
[4], and set a start delay time in par. 1-71 Start
Delay. A reference signal must be present.
1-8* Stop Adjustments
"
Parameters for setting special stop fea-
tures for the motor.
*
[ ] value for use in communication via serial communication port
MG.33.B6.22 - VLT is a registered Danfoss trademark
1-74 Start Speed [RPM]
Range:
0 - 600 RPM
Function:
1-75 Start Speed [Hz]
Range:
0 - 500 Hz
Function:
1-76 Start Current
Range:
0.00 - par. 1-24 A
Function:
1-80 Function at Stop
Option:
Coast
DC hold
*
0 RPM
*
0 Hz
*
0.00 A
[0]
[1]