1-70 PM Start Mode
This parameter is valid for software version 2.80 and later
versions. Use this parameter to select the PM motor start mode,
which is to initialize the VVC
+
control core for previously free-
running PM motors. This parameter is active for PM motors in
VVC
+
mode only if the motor is stopped (or running at low
speed).
Option:
Function:
detects that motor is running at low
speed or is stopped, the frequency
converter sends out a DC current to park
the motor at an angle. The frequency
converter then starts the motor from that
angle.
1-71 Start Delay
Range:
Function:
0 s
*
[0 - 10
s]
This parameter enables a delay of the starting
time. The frequency converter begins with the
start function selected in
. Set the start delay time until
acceleration is to begin.
1-72 Start Function
Option:
Function:
[0]
DC Hold/
delay time
The motor is energized with
parameter 2-00 DC Hold/Motor Preheat Current
during start delay time.
[2]
*
Coast/delay
time
The frequency converter is coasted during
start delay time (frequency converter off).
1-73 Flying Start
Option:
Function:
This function makes it possible to catch a motor
which is spinning freely due to a mains drop-out.
Flying start searches in clockwise direction only. If
not successful, a DC brake is activated. If PM
motor is selected, Parking is carried out if the
speed is below 2.5–5%, in the time set in
.
[0]
*
Disabled Select
[0] Disabled
if this function is not required.
[2] Enabled
Always
Select
[2] Enabled always
to enable the frequency
converter to “catch” and control a spinning motor.
The parameter is always set to
[2] Enabled always
when
parameter 1-10 Motor Construction
=
[1] PM
non-salient
.
Important related parameters:
•
Parameter 2-01 DC Brake Current
•
Parameter 2-06 Parking Current
•
The flying start function used for PM motors is based on
an initial speed estimation. The speed is always estimated
as the first thing after an active start signal is given.
If the speed estimate comes out below 2.5–5% of nominal
speed, the parking function is engaged (see
parameter 2-06 Parking Current
and
). Otherwise, the frequency converter catches the
motor at that speed and resumes normal operation.
Current limitations of the flying start principle used for PM
motors:
•
The speed range is up to 100% nominal speed or
the field weakening speed (which ever is lowest).
•
For high inertia applications (that is, where the
load inertia is more than 30 times larger than the
motor inertia).
1-80 Function at Stop
Option:
Function:
Select this function after a stop command or
after the speed is ramped down to the
settings in
.
[0]
*
Coast
Leaves the motor in free mode.
[1]
DC hold /
Motor
Preheat
Energizes the motor with a DC hold current
(see
parameter 2-00 DC Hold/Motor Preheat
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 -
2.0 ]
Set AC brake power capability (set the ramp-down
time when inertia is constant). If the DC-link
voltage is not higher than DC-link voltage
warning value, the generator torque can be
adjusted with this function .
The higher the AC-brake gain, the stronger the
brake capability. If the brake gain equals to 1.0,
there is no AC brake capability.
NOTICE
Continuous generator torque can lead to
overheating of the motor due to high
motor current. Protect the motor against
overheating in
.
Parameters
VLT
®
DriveMotor FCP 106/FCM 106
48
Danfoss A/S © 11/2015 All rights reserved.
MG03N202
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