UPS SYSTEM STATIC AND MECHANICAL BYPASS
UPS SYSTEM STATIC AND MECHANICAL BYPASS
(OP)
We have a 60kva Merlin Gerin UPS for data center when one of its module broke down (draw-out type). When it faulted out it shifted to the utility line via static switches. I am aware that the load side,the line side and the inverter are "sync". Anyway using the manufacturers instruction, there is a mechanical bypass which we can also use for maintenance. In short from static switch we shifted to mechanical bypass and changed the defective module. Then from mechanical to static and back to the inverter and the UPS is back in service. My question is, I am a bit puzzled with the mechanical bypass ( sets of breakers ). Will there be an arcing on the breakers that will affect the critical load when we switched to the static and vice versa. I know the repair is successful but this is something that bothers me technically. The computers were okay during the repair process..
any info. is appreciated..
any info. is appreciated..






RE: UPS SYSTEM STATIC AND MECHANICAL BYPASS
The obvious presumption is that the maintenance by pass is used with both sources in synch.
RE: UPS SYSTEM STATIC AND MECHANICAL BYPASS
" system start up") :
close Mains 1 input switch Q1,the system powers up
the rectifier/charger automatically starts,then close:
1/ QF1- battery is on
2/ Q5N - load is connected to the invertor's output
3/ QS4 - static switch is connected to the circuit
and only now you can open Q3BP and then press the "inverter on" button on the control panel.
This sequence ensures the "make before break" principle.
RE: UPS SYSTEM STATIC AND MECHANICAL BYPASS
RE: UPS SYSTEM STATIC AND MECHANICAL BYPASS
I agree with Maiham and sanvapat the manual by pass switch is made-before-break or zero break switch. It is the same with my system also made by solidstate.