ABB ACS880 Firmware Manual page 125

U ac,rms
If the user-defined reference
the control program uses the internal reference as the drive DC voltage reference.
Maximum DC voltage reference ( U
U dc,max = U cat,hi × √2 × 1.13
where
U dc,max
U cat,hi
If the user-defined reference (94.22) is more than the maximum DC voltage
reference ( U
dc,max
voltage reference.
Maximum drive output voltage
U ac,out = (U dc /√2) × (1 - U res )
where
U ac,out
U dc
U res
The voltage reserve setting (97.4) limits the maximum drive output voltage.
Limit calculation examples
Example 1: Calculating the internal DC voltage reference and maximum DC voltage
reference
The voltage category is 380 ... 415 V and the power line voltage is 400 V.
Internal DC voltage reference U
Maximum DC voltage reference U
Example 2: Calculating the maximum output voltage of the drive
DC voltage is 650 V DC, and the voltage reserve setting ( 97.04) is -2%.
The maximum output voltage of the drive is U
Settings and diagnostics
Actual input supply voltage.
(94.22 is less than the internal reference value ( U
dc,max
Maximum DC voltage reference
Upper limit of the largest supply voltage range selection available
for the drive (95.1)
), the control program uses the maximum value as the drive DC
Maximum output voltage of the drive
Actual DC voltage
Value of parameter
dc,int
dc,max
)
97.4
= 400 V × √2 × 1.03 = 583 V.
= 415 V × √2 × 1.13 = 663 V.
= (650 / √2) × (1 + 0.02) = 469 V.
ac,out
Program features 125
dc,int
),