User`s guide

126
CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Range
[Factory Setting]
Parameter
Unit
Description / Notes
P310
(3)
0 to 3
Flying Start and
[ 0
]
Ride-Through
-
P311
0.1 to 10.0
Voltage Ramp
[ 5.0 s ]
0.1 s
The parameter P310 selects the active function(s):
P310
0
1
2
3
Flying Start
Inactive
Active
Active
Inactive
Ride-Through
Inactive
Inactive
Active
Active
Parameter P311 sets the time required for the motor
restart, both
for
F
lying
S
tartfunctionand the
R
ide-
T
hrough
function.In otherwords, it
defines thetime tosetthe output
voltage starting from 0 V and up to reaching the rated
voltage.
Operation of the Flying Start function:
-
It allows the motor to start when it is running. This
functions actsonlywhenthe inverter is enabled. During
the start, the inverterwill impose the speedreference,
creating a voltage ramp with time defined at P311.
-
The motor can be started in conventional form, even
when the FlyingStart hasbeen selected(P310 = 1 or2),
adjusting one of the digital inputs (DI3 or DI4) to 13
(Flying Start disable) and driving it (0 V) during the
motor start.
Ride-Through operation:
-
Permits the inverter recovery,withoutdisabling byE02
(undervoltage), when a momentaryvoltagedropin the
line occurs.
Theinverter will be disabled only by E02,if the voltage
drop is longer than 2.0 s.
-
When the Ride-Through function is enabled(P310 = 2
or3)
and if a voltage dropin the line occurs, so thelink
circuit voltage becomes lower than the permitted
undervoltage level, the output pulses will be disabled
(motor
runs freely
)
and the inverter waits up to 2 s for
thelinere-establishment. Ifthe line returns toitsnormal
status within this time, the inverter will enable again
the PWM pulses, imposing the frequency reference
instantaneouslyandproviding avoltage ramp with time
defined at P311.
-
There is a dead time before this voltage ramp is
started, required for the motor demagnetization. This
time is proportional to the output frequency (motor
speed).
Table 6.27
-
Activation of the function Flying Start and Ride-Through
by the parameter P310