Danfoss VLT Midi Drive FC 280, Programming Manual

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1-70 PM Start Mode
Select the PM motor start-up mode. To initialize the VVC
+
control
core for previously free-running PM motor. Active for PM motors
in VVC
+ only if the motor is stopped (or running at very low
speed).
Option: Function:
[0]
*
Rotor Detection Estimates the electrical angle of the rotor
and uses this angle as a starting point.
This option is the standard selection for
industrial applications. If flystart detects
that the motor runs at low speed or has
stopped, the frequency converter detects
the rotor position (the angle), and starts
the motor from that position.
[1] Parking The parking function applies DC current
across the stator winding and rotates the
rotor to electrical 0 position. This option is
typically for pump and fan applications. If
flystart detects that the motor runs at low
speed or has stopped, the frequency
converter sends out a DC current to make
the motor park at an angle and then start
the motor from that position.
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
parameter 1-72 Start
Function . Set the start delay time until
acceleration is to begin.
1-72 Start Function
Option: Function:
Select the start function during start delay.
This parameter is linked to
parameter 1-71 Start Delay .
[0] DC Hold/
delay time
Energizes motor with a DC hold current
(
parameter 2-00 DC Hold/Motor Preheat Current )
during the start delay time.
[1] DC-Brake/
delay time
[2]
*
Coast/delay
time Motor coasted during the start delay time
(inverter off).
[3] Start speed
cw
Only possible with VVC
+
. Regardless of the
value applied by the reference signal, the
output speed applies the setting of the start
speed in
parameter 1-75 Start Speed [Hz] and
the output current corresponds to the setting
of the start current in
parameter 1-76 Start
Current . This function is typically used in
hoisting applications without counterweight
and especially in applications with a Cone-
1-72 Start Function
Option: Function:
motor, where the start is clockwise, followed
by rotation in the reference direction.
[4] Horizontal
operation
Only possible with VVC
+
.
For obtaining the function described in
parameter 1-75 Start Speed [Hz] and
parameter 1-76 Start Current during the start
delay time. The motor rotates in the reference
direction. If the reference signal equals zero
(0),
parameter 1-75 Start Speed [Hz] is ignored
and the output speed equals zero (0). The
output current corresponds to the setting of
the start current in
parameter 1-76 Start
Current .
[5] VVC+
clockwise
The start speed is calculated automatically.
This function uses the start speed in the start
delay time only.
1-73 Flying Start
Option: Function:
NOTICE
This parameter cannot be changed while
the motor is running.
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.
Catches a motor which is spinning freely due
to a mains dropout.
[0]
*
Disabled No function.
[1] Enabled Enables the frequency converter to catch and
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.
[2] Enabled
Always Enables flying start at every start command.
[3] Enabled
Ref. Dir. Enables the frequency converter to catch and
control a spinning motor. The searching is
performed only in the reference direction.
[4] Enab.
Always Ref.
Dir. Enables flying start at every start command.
The searching is performed only in the
reference direction.
Parameter Descriptions Programming Guide
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