Two PCS vacuum pumps can be run by manual and automatic. You can choose the amount of pumps which should be run. One PCS vacuum pump can be run by manual and automatic with low vacuum. Or one PCS of vacuum pump can be run by manual and the other one can be run by automatic with high vacuum. 

The vacuum pumps can be worked or stopped under running by manual. 

The vacuum pumps can be set vacuum, stopped with toplimit vacuum, worked with lowerlimit vacuum. 

2. Overcurrent protection, earth leakage protection 

3. Power Light on/off, operation indicating, overcurrent failure warning(voltage indicating and power indicating is optional). 

4. Error protection of system 

The other one will be automatic run with setting when one pump is overloaded. The system will not be stopped lead to influence other equipment in the factory and the normal work of product line because of the stoppage. 

5. You can set the vacuum upper and lower limits of system with your requirements. 

6. Function of against frequent startup, you can adjust the setting time of time delay relay.