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NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
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Flying start
P520
(flying start)
0 ... 4
This function is required to connect the VFD to already rotating motors, e.g. in fan drives. Motor
frequencies >100 Hz are only picked up in speed controlled mode (Servo mode P300 = ON).
{ 0 }
NOTE:
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NOTE:
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Flying start resolution
P521
(flying start resolution)
0.02... 2.50 Hz
Using this parameter, the flying start circuit search increment size can be adjusted. Values that
are too large affect accuracy and causes the VFD to cut out with an overcurrent message. If the
{ 0.05 }
values are too small, the search time is greatly extended.
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Flying start offset
P522
(flying start offset)
-10.0 ... 10.0 Hz
A frequency value that can be added to the frequency value found, e.g. to remain in the motor
range and so avoid the generator range and therefore the chopper range.
{ 0.0 }
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194
0 = Switched off, no flying start.
1 = Both directions, the VFD looks for a speed in both directions.
2 = Direction of setpoint, searches only in the direction of the setpoint value which is present.
3 = Both dir. after fault, same as { 3 } but only after mains failure or fault
4 = Setpoint after fault same as { 2 } but only after mains failure or fault
For physical reasons, the flying start circuit only operates above 1/10 of the nominal
motor frequency (P201), however not below 10 Hz.
(P201)
f=1/10*(P201)
Comparison of f vs. f
min
f
=10 Hz
with:
min
Result f
=
fly
PMSM: The catch function automatically determines the direction of rotation. The
device therefore behaves in an identical way to function 1 with the setting for
function 2. The device behaves in an identical way to function 3 with the setting for
function 4.
In CFC closed loop operation, the catch circuit can only be executed if the rotor
position is known in relation to the incremental encoder. For this purpose, the motor
initially cannot rotate when it is switched on for the first time after a "Power On" of
the device.
Example 1
50Hz
f=5 Hz
5 Hz < 10 Hz
The flying start circuit
functions above f
=10 Hz.
fly
S
P
Example 2
200Hz
f=20Hz
20 Hz > 10 Hz
The flying start circuit
functions above f
=20 Hz.
fly
S
P
S
P
BU 0200 en-US-4920
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