First check whether the Contactors are engaging and the Fuses are not burnt. Check the condition of individual Capacitors,whether you have Current flow through the 3 cables connected to the Capacitor. If the above conditions are ok. You can upgrade the steps. Let's say,if it is 20kvar,you can upgrade to 25kvar. The 3rd step onwards,you can upgrade to 50 kvar (25kvar Capacitors connected in parallel from the same Contactor or two different Contactors from one step ),but in this case,the fuses have to be upgraded,the incoming Isolator,busbar or cables too.
How to solve this without adding a capacitor bank
First check whether the Contactors are engaging and the Fuses are not burnt.
Check the condition of individual Capacitors,whether you have Current flow through the 3 cables connected to the Capacitor.
If the above conditions are ok.
You can upgrade the steps.
Let's say,if it is 20kvar,you can upgrade to 25kvar.
The 3rd step onwards,you can upgrade to 50 kvar (25kvar Capacitors connected in parallel from the same Contactor or two different Contactors from one step ),but in this case,the fuses have to be upgraded,the incoming Isolator,busbar or cables too.