Lenze i410 - Flying Restart Circuit

9.2.9 Flying restart circuit
The
ying restart funcon makes it possible to restart a coasng motor on the y during
operaon without speed feedback. Synchronicity between the inverter and the motor is
coordinated so that the transion to the rotang drive is eected without jerk at the me of
connecon.
Precondions
•
Driv
e systems with speed feedback do not need a ying restart circuit because there is
alw
ays a jerk-free synchronisaon to the feedback speed.
•
The ying restart circuit operates safely and reliably in case of drives with high centrifugal
masses. If several motors with dierent centrifugal masses are connected to the inverter,
the ying restart circuit must not be used.
•
The ying restart circuit serves to idenfy rotang eld frequencies of up to ±200 Hz.
Required sengs before the ying restart circuit is used:
1.
The motor data must be set correctly. 4Motor data ^ 39
2.
The sengs for the current controller and the ying restart controller must be adapted to
the motor. The sengs are made automacally if one of the following opmizaons is
carried out:
4Select motor from motor catalog ^ 40
4Automac motor
idencaon (energized) ^ 178
4Automac motor calibraon (non-energized) ^ 179
Details
The inverter determines synchronicity by idenfying the synchronous rotang eld frequency.
The "search" starts in the posive direcon.
Duraon:
•
The ying restart process is determined within approx. 0.5 ... 1.5 seconds.
•
The duraon is inuenced by the start frequency 0x2BA1:001 (P718.01).
Seng the funcon:
1.
As s
tart behavior, set the selecon "Flying restart circuit [2]" in 0x2838:001
(P203.01).
•
Thus, every inverter enable causes a synchronisaon to the rotang or standing motor.
•
Aer the inverter has been enabled, the motor can temporarily start or reverse if
drives with low fricon and low mass inera are used.
•
If the inverter is operated with the default sengs, no further sengs are required for
most applicaons.
2.
If r
equired, adapt the current 0x2BA1:001 (P718.01) and the start frequency 0x2BA1:002
(P718.02) for the ying restart circuit.
•
Seng notes can be found in the "Info" column for the respecve parameter.
For diagnosc purposes, the frequency detected when the motor has been restarted on the
y is displayed in 0x2B
A1:008 (P718.08).
Parameter
Address Name / seng range / [default seng] Informaon
0x2BA1:001
(P718.01)
Flying restart circuit: Current
(Flying r
estart: Current)
0 ... [30] ... 100 %
The current set here is injected into the motor during the ying restart
process for the idencaon of the rotang eld frequency.
•
100 % = Motor rated current 0x6075 (P323.00)
•
Reducing the current causes a reducon of the motor torque during
the ying restart process. A short-me starng acon or reversing of
the motor is prevented with low ying restart currents.
•
If the current is set too low, the rotang eld frequency cannot be
idened correctly.
•
If the current is increased, this improves the robustness of the ying
restart circuit.
Conguring the motor control
V
/f characterisc control for asynchronous motor (VFC open loop)
Flying restart circuit
154