EX4200-48P with dual PSU - about 240W power consumption ?

Hello,

I've got a refurbished EX4200-48P switch, see config below. When I plug the only PSU, the power consumption on wattmeter is about 140W, when I plug the second one, the load goes up almost twice (about 240W). Is it normal behavior? Nothing is plugged in and PoE is disabled on all ports. What if I would put a 320W PSUs inside, could the power consuption be lower? I do NOT need PoE.

Thank you.

admin@ex4200> show chassis hardware
Hardware inventory:
Item             Version  Part number  Serial number     Description
Chassis                                BQ0210090238      EX4200-48P
Routing Engine 0 REV 24   750-021255   BQ0210090238      EX4200-48P, 48 POE
FPC 0            REV 24   750-021255   BQ0210090238      EX4200-48P, 48 POE
  CPU                     BUILTIN      BUILTIN           FPC CPU
  PIC 0                   BUILTIN      BUILTIN           48x 10/100/1000 Base-T
  PIC 1          REV 07   711-026017   CH0214300379      2x 10GE SFP+
Power Supply 0   REV 03   740-020959   AV0810080623      PS 930W AC
Power Supply 1   REV 03   740-020959   AV0810080643      PS 930W AC
Fan Tray                                                 Fan Tray