ABB ACS880 - Page 125

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