Danfoss VLT Midi Drive FC 280 Programming Manual page 39

Parameter Descriptions
1-70 PM Start Mode
Select the PM motor start-up mode. To initialize the VVC
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:
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 This parameter enables a delay of the starting
*
s] 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/ Energize motor with a DC hold current
delay time (parameter 2-00 DC Hold/Motor Preheat Current)
during the start delay time.
[1] DC-Brake/ Energize motor with a DC hold current
delay time (parameter 2-01 DC Brake Current) during the
start delay time.
[2] Coast/delay Motor coasted during the start delay time
time (inverter off).
*
[3] Start speed
Only possible with VVC
cw
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-
motor, where the start is clockwise, followed
by rotation in the reference direction.
[4] Horizontal
Only possible with VVC
operation
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 0,
parameter 1-75 Start Speed [Hz] is ignored and
the output speed equals 0. The output current
corresponds to the setting of the start current
in parameter 1-76 Start Current.
MG07C302
Programming Guide
1-72 Start Function
Option:
+
control
[5]
1-73 Flying Start
Option:
[0]
*
[1]
[2]
[3]
+ . Regardless of the
[4]
1-75 Start Speed [Hz]
Range:
Size
related
+
.
1-76 Start Current
Range:
Size
related
Danfoss A/S © 07/2016 All rights reserved.
Function:
VVC+ The start current is calculated automatically.
clockwise This function uses the start speed in the start
delay time only.
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.
Catch a motor which is spinning freely due to
a mains dropout.
Disabled No function.
Enabled Enable 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.
Enabled Enable flying start at every start command.
Always
Enabled Enable the frequency converter to catch and
Ref. Dir. control a spinning motor. The search is
performed only in the reference direction.
Enab. Enable flying start at every start command. The
Always Ref. search is performed only in the reference
Dir. direction.
Function:
[ 0 - This parameter can be used for hoist
500.0 applications (cone rotor). Set a motor start
*
Hz] 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:
[ 0 - Some motors, for example cone rotor
10000 A] motors, need extra current/starting speed
*
to disengage the rotor. To obtain this boost,
4 4
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