Stop Adjustments; Function At Stop; Flying Start; Start Current - Danfoss VLT AutomationDrive Programming Manual

Parameter Descriptions

1-73 Flying Start

Option:
3 3
[0] Disabled
*
[1] Enabled
[2] Enabled Always
[3] Enabled Ref. Dir.
[4] Enab. Always
Ref. Dir.
NOTE!
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.
NOTE!
To obtain the best flying start performance the advanced
motor data, parameters 1-30 through 1-35, must be
correct.
1-74 Start Speed [RPM]
Range:
Application
dependent
*
1-75 Start Speed [Hz]
Range:
Application
dependent
*

1-76 Start Current

Range:
0.00 [Application
A dependant]
*
3-22
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FC 300 Programming Guide
Function:
This function makes it possible to catch
a motor that is spinning freely due to a
line drop-out.
No function
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.
Function:
[0 - 600 RPM] This parameter can be used
for hoist applications (cone
rotor).
Function:
[Application This parameter can be used for
dependant] hoist applications (cone rotor).
Set a motor start speed. After the
start signal, the output speed
leaps to set value. Set the start
function in 1-72 Start Function to
[3], [4] or [5], and set a start
delay time in 1-71 Start Delay.
Function:
Some motors, e.g., cone rotor motors,
need extra current/starting speed to
MG33MD22 - VLT
1-76 Start Current
Range:

3.3.8 1-8* Stop Adjustments

1-80 Function at Stop

Option:
Select the Adjustable frequency drive
function after a stop command or after the
speed is ramped down to the settings in
1-81 Min Speed for Function at Stop [RPM].
[0] Coast Leaves motor in free mode. The motor is
disconnected from the Adjustable frequency
*
drive.
[1] DC hold Energizes motor with a DC holding current
(see 2-00 DC Hold Current).
[2] Motor check Checks if a motor has been connected.
[3] Pre- Builds up a magnetic field while the motor
magnetizing is stopped. This allows the motor to
produce torque quickly at subsequent start
commands (asynchronous motors only). This
pre-magnetizing function does not help the
very first start command. Two different
solutions are available to pre-magnetize the
machine for the first start command:
Sample rotor time constants =
(Xh+X2) / (6.3*Freq_nom*Rr)
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is a registered Danfoss trademark
Function:
disengage the rotor. To obtain this
boost, set the required current in
1-76 Start Current. Set 1-74 Start Speed
[RPM]. Set 1-72 Start Function to [3] or
[4], and set a start delay time in
1-71 Start Delay.
This parameter can be used for hoist
applications (cone rotor).
Function:
1. Start the Adjustable frequency
drive with a 0RPM reference and
wait 2 to 4 rotor time constants
(see below) before increasing the
speed reference.
2a. Set 1-71 Start Delay to the
desired pre-mag time (2 to 4 rotor
time constants - see below).
2b. Set 1-72 to either [0] DC-hold
or [1] DC Brake.
Set the DC hold or DC brake
current magnitude (2-00 or 2-01) to
be equal to I_pre-mag = Unom /
(1.73 x Xh)