Danfoss VLT AutomationDrive FC 360 Programming Manual page 45

Parameter Descriptions
4.2.9 1-8* Stop Adjustments
Parameters for adjusting motor stop settings.
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 1-82 Min
Speed for Function at Stop [Hz].
Available selections depend on the setting in
parameter 1-10 Motor Construction.
•
[0] Asynchron.
•
[1] PM, non salient SPM.
•
[3] PM, salient IPM.
[0] Coast Leaves the motor in free mode.
*
[1] DC hold / Energizes the motor with a DC hold current
Motor (see parameter 2-00 DC Hold/Motor Preheat
Preheat Current.
[3] Pre- Builds up a magnetic field while the motor is
magnetizing stopped. This allows the motor to produce
torque quickly at commands (asynchronous
motors only). This premagnetizing function
does not help the very first start command.
Two different solutions are available to pre-
magnetize the machine for the first start
command:
Solution 1:
1. Start the frequency converter with a
0 RPM reference.
2. Wait 2 to 4 rotor time constants (see
the equation below) before
increasing the speed reference.
Solution 2:
1. Set parameter 1-71 Start Delay to the
premagnetize time (2–4 rotor time
constants).
2. Set parameter 1-72 Start Function to
[0] DC hold.
3. Set the DC-hold current magnitude
(parameter 2-00 DC Hold/Motor
Preheat Current to be equal to I
= U
Sample rotor time constants=
(Xh+X2)/(6.3*Freq_nom*Rr)
MG06C702
Programming Guide
- [0] Coast.
- [1] DC hold / Motor Preheat.
- [3] Pre-magnetizing.
- [0] Coast.
-
[1] DC hold / Motor Preheat.
pre-mag
/(1.73 x Xh).
nom
Danfoss A/S © 06/2017 All rights reserved.
1-80 Function at Stop
Option: Function:
1 kW=0.2 s
10 kW=0.5 s
100 kW=1.7 s
1-82 Min Speed for Function at Stop [Hz]
Range: Function:
0 Hz [0 - 20 Hz] Set the output frequency at which to
*
activate parameter 1-80 Function at Stop.
1-88 AC Brake Gain
Range: Function:
1.4 [1.0 - This parameter is used to set AC brake power
*
2.0 ] capability (set ramp-down time when inertia is
constant). In cases where the DC-link voltage is
not higher than DC-link voltage trip value, the
generator torque can be adjusted with this
parameter. The higher AC brake gain is, the
stronger the brake capability is. Select 1.0 means
that there is no AC brake capability.
NOTICE
If there is continuous generator torque,
higher generator torque causes higher
motor current, and the motor becomes hot.
In this condition, parameter 2-16 AC Brake,
Max current can be used to protect the
motor from overheating.
4 4
43