Danfoss VLT AutomationDrive FC 301 Programming Manual page 52

Parameter Descriptions
1-72 Start Function
Option:
[6] Hoist Mech.
Brake Rel
3 3
1-73 Flying Start
Option:
[0] Disabled No function
*
[1] Enabled Enables the frequency converter to catch and
NOTICE
This function is not recommended for hoisting
applications.
For power levels above 55 kW, flux mode must be used
to achieve the best performance.
NOTICE
To obtain the best flying start performance, the
advanced motor data, parameter 1-30 Stator Resistance
(Rs) to parameter 1-35 Main Reactance (Xh), must be
correct.
1-74 Start Speed [RPM]
Range:
0 RPM [0 -
*
600
RPM]
50
VLT
Function:
For utilizing mechanical brake control functions
(parameter 2-24 Stop Delay to
parameter 2-28 Gain Boost Factor). This
parameter is only active in flux control
principle, in a mode with motor feedback or
sensorless mode.
Function:
NOTICE
This parameter cannot be adjusted while
the motor is running.
This function makes it possible to catch a motor
which is spinning freely due to a mains dropout.
control a spinning motor.
When parameter 1-73 Flying Start is enabled,
parameter 1-71 Start Delay and
parameter 1-72 Start Function have no function.
When parameter 1-73 Flying Start is enabled,
parameter 1-58 Flying Start Test Pulses Current and
parameter 1-59 Flying Start Test Pulses Frequency
are used for specifying the conditions for the
flying start.
Function:
Set a motor start speed. After the start signal,
the output speed leaps to set value. Set the
start function in parameter 1-72 Start Function
to [3] Start speed cw, [4] Horizontal operation,
or [5] VVC + /Flux clockwise, and set a start
delay time in parameter 1-71 Start Delay.
Danfoss A/S © 01/2018 All rights reserved.
®
AutomationDrive FC 301/302
1-75 Start Speed [Hz]
Range:
0 Hz [0.0 -
*
500.0
Hz]
1-76 Start Current
Range:
0.00 [0.00 -
A par.
*
1-24 A]
3.2.11 1-8* Stop Adjustments
1-80 Function at Stop
Option:
[0] Coast
*
[1] DC hold
[2] Motor check
[3] Pre-
magnetizing
Function:
This parameter can be used for hoist
applications (cone rotor). Set a motor start
speed. After the start signal, the output speed
leaps to the set value. Set the start function in
parameter 1-72 Start Function to [3] Start speed
cw, [4] Horizontal operation, or [5] VVC
clockwise, and set a start delay time in
parameter 1-71 Start Delay.
Function:
Some motors, for example cone rotor motors,
need extra current/starting speed to disengage
the rotor. To obtain this boost, set the required
current in parameter 1-76 Start Current. Set
parameter 1-74 Start Speed [RPM]. Set
parameter 1-72 Start Function to [3] Start speed
cw or [4] Horizontal operation, and set a start
delay time in parameter 1-71 Start Delay.
This parameter can be used for hoist
applications (cone rotor).
Function:
Select the frequency converter function after
a stop command or after the speed is
ramped down to the settings in
parameter 1-81 Min Speed for Function at
Stop [RPM].
Leaves motor in free mode. The motor is
disconnected from the frequency converter.
Energizes the motor with a DC hold current
(see parameter 2-00 DC Hold Current).
Checks if a motor has been connected.
Builds up a magnetic field while the motor
is stopped. This allows the motor to produce
torque quickly at subsequent start
commands (asynchronous motors only). This
premagnetizing function does not help the
very first start command.
Two different solutions are available to
premagnetize the machine for the first start
command:
•
Start the frequency converter with
a 0 RPM reference and wait 2-4
rotor time constants before
increasing the speed reference.
•
Use the start delay with DC hold:
+ /Flux
MG33MO02