Danfoss VLT AutomationDrive FC 302, Руководство по программированию, Страница: 62 / 346

1-74 Start Speed [RPM]
Range: Function:
Size
related
*
[0 -
600
RPM] 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 .
1-75 Start Speed [Hz]
Range: Function:
Size
related
*
[ 0 -
500.0
Hz] 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 + /Flux clockwise , and set a start delay
time in parameter 1-71 Start Delay .
1-76 Start Current
Range: Function:
0
A
*
[ 0 -
par.
1-24 A] 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).
3.2.12 1-8* Stop Adjustments
1-80 Function at Stop
Option: 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]
.
[0]
*
Coast Leaves motor in free mode. The motor is
disconnected from the frequency converter.
[1] DC hold Energizes the motor with a DC hold current
(see
parameter 2-00 DC Hold Current ).
[2] Motor check Checks if a motor has been connected.
[3] Pre-
magnetizing 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
1-80 Function at Stop
Option: Function:
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:
•
Set parameter 1-71 Start
Delay to the required
premagnetizing time (2–4
rotor time constants. See
the time constants
description further in this
section).
•
Set parameter 1-72 Start
Function to either [0] DC
hold or [1] DC Brake .
•
Set the DC hold or DC
brake current magnitude
(
parameter 2-00 DC Hold
Current or
parameter 2-01 DC Brake
Current
) to be equal to
I_pre-mag = Unom/(1.73
x Xh)
Sample rotor time constants =
(Xh+X2)/(6.3*Freq_nom*Rr)
1 kW = 0.2 s
10 kW = 0.5 s
100 kW = 1.7 s
1000 kW = 2.5 s
[4] DC Voltage
U0 When the motor is stopped, the
parameter 1-55 U/f Characteristic - U [0]
defines the voltage at 0 Hz.
[5] Coast at low
reference When the motor is stopped, the
parameter 1-55 U/f Characteristic - U [0]
defines the voltage at 0 Hz.
[6] Motor check,
alarm When the motor is stopped, the
parameter 1-55 U/f Characteristic - U [0]
defines the voltage at 0 Hz.
1-81 Min Speed for Function at Stop [RPM]
Range: Function:
Size related
*
[0 - 600
RPM] Set the speed at which to activate
parameter 1-80 Function at Stop .
Parameter Descriptions
VLT
®
AutomationDrive FC 301/302
60 Danfoss A/S © 10/2018 All rights reserved. MG33MP02
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