Lenze i550 - Imax Controller

10.7.6.7 Imax controller
For a quick commissioning, the calculaons and sengs are made automacally during the
motor calibraon.
For typical applicaons, a manual adaptaon of the parameters of the Imax con-
troller is not recommended. A wrong seng may have a negave eect on the
control. For special applicaons, contact the manufacturer before adapng the
parameters.
Precondions
The Imax controller is only eecve in the following motor control types:
•
V/f characterisc control (VFC open loop)
•
V/f characterisc control (VFC closed loop)
Details
The Imax controller becomes acve in the V/f operaon if the actual motor current exceeds
the maximum overload current "Max current". The Imax controller changes the output fre-
quency to counteract the exceedance.
The maximum overload current "Max current" is dened in 0x6073 (P324.00) in percent with
regard to the rated motor current "Motor rated current" 0x6075 (P323.00).
If the maximum overload current is exceeded:
•
During operaon in motor mode, the Imax controller reduces the output frequency.
•
During operaon in generator mode, the Imax controller increases the output frequency.
Seng notes
If oscillaons occur at the current limit during operaon:
•
Reduce gain of the Imax controller in 0x2B08:001 (P333.01).
•
Increase reset me of the Imax controller in 0x2B08:002 (P333.02).
•
Carry out the changes in small steps only (by 2 ... 3 % of the set value) unl the oscillaons
do not exist anymore.
If the Imax controller does not respond fast enough aer the maximum current has been
exceeded:
•
Increase gain of the Imax controller in 0x2B08:001 (P333.01).
•
Reduce reset me of the Imax controller in 0x2B08:002 (P333.02).
•
Carry out the changes in small steps only (by 2 ... 3 % of the set value in each case) unl
the response me is acceptable.
Parameter
Address Name / seng range / [default seng] Info
0x2822:019 Calculate Imax controller parameter
0 ... [0] ... 1
1 = start automac calculaon of the Imax controller parameters.
•
Gain 0x2B08:001 (P333.01) and reset me 0x2B08:002 (P333.02) of
the Imax controller are recalculated and set.
0x2B08:001
(P333.01)
V/f Imax controller: Gain
(V/f Imax contr.: Gain)
0.000 ... [0.284]* ... 1000.000 Hz/A
* Default seng depending on the size.
Gain factor Vp of the Imax controller.
0x2B08:002
(P333.02)
V/f Imax controller: Reset me
(V/f Imax contr.: Reset me)
1.0 ... [2.3]* ... 2000.0 ms
* Default seng depending on the size.
Reset me Ti of the Imax controller.
Conguring the motor control
Opons for opmising the control loops
Motor control sengs
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