202
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
Appendix B
CGCM-DLR Unit Math Models
Soft Start Control
The soft start control function is provided to cause orderly build-up of terminal
voltage from the residual voltage to the rated voltage in desired time with
minimal overshoot. In CGCM-DLR units, the fast dynamic response is used
while the voltage reference is adjusted based on the elapsed time. When the
system is under start-up condition, the voltage reference is adjusted by the
amount calculated based on two programmable parameters, initial soft-start
voltage level (V
O
), and desired time (T
SS
) to build up to the rated voltage. Its
mathematical model is shown in Soft Start Control. The soft start gain (K
SS
) is
calculated by using this formula.
K
SS
= (V
REF
- V
O
) / T
SS
Figure 68 - Soft Start Control
Time From Start
AVR
Summing
Point