6-15
Current controlled start-up (55-ISEL = 1)
Once the inverter is started, the motor is accelerated with 32-RACC1.
On reaching the current limit of 75% of 56-ILIM the acceleration is slowed
down. If the phase current 14-IS increases further and exceeds 100%
of 56-ILIM, the motor is not further accelerated. When the current limit
of 125% of 56-ILIM is exceeded, the rotary field frequency input with
FSIN is reduced with the ramp 58-RILIM to the minimum lowering
frequency 57-FILIM . When the phase current subsides to below 100%
of 56-ILIM, the inverter accelerates the motor further with the ramp 32-
RACC1, the same applying for braking. The frequency can then be raised
up to 94-MAXF, see Fig. 6-9.
Current controlled start-up (55-ISEL = 2)
Operation as above with following difference:
Once the current limit of 125% of 56-ILIM has been exceeded, the ramp
32-RACC1 does not accelerate further. There are no further frequency
reductions.
Current controlled start-up (55-ISEL = 3/4/5)
More detailed information available on request.
Fig. 6-9 (Current controlled start-up)
100%
75%
125%
FSIN
FILIM
12-F 56-ILIM
t
RACC
RILIM
RACC
12-F
14-IS
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