Vonsch Quatrofrem Series, Конфигурация и диагностика

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UNIFREM v.3.41x
10 May 2017 Page 145 from 180
Flying start – principles of operation
Success of flying start and search time is dependent on the following parameters:
(Multiple of magnetization current
– it affects the sensitivity of the flying start and intensity of rotor
braking)
Parameter ID: 778
SETTINGS
– > CONTROL AND REGULATION – > FLYING START -> Inaf/I0 Ratio [ ]
(Time constant MT
– affects the speed of motor excitation)
Parameter ID: 79
SETTINGS
– > MOTOR -> SPECIAL PARAMETERS -> Time constant MT [s]
Example:
Flying start to rotating motor
(thin line - output frequency, thick line - motor current, red dotted line - the rotor frequency)
8.9 Power restriction
In a real environment, the need to keep the drive in operating mode even if the motor or the
converter is overloaded can occur. Possible fault caused by overloading or overheating should
cause outage of the technology, which could be worse than an eventual short term decrease of the
t [s]
Motor
current [A]
█ - rotor frequency
█ - output frequency
█ - motor current
F
SETPOIINT
Frequency
[Hz]
START
command
I. Direction
detection and
excitation-on
IV. Ramp-up
to
F
SETPOINT
finding
the frequency
F
MAX
II. Frequency
detection
III. ex-
citation
Flying start time
PAR.ID = 375
Inaf/I0 ratio x
Magnetizing
current
= ID778 x ID355