FPS-T1U Instruction Manual
CHAPTER 20 PARALLEL AND SERIES OPERATION
20.1 Parallel operation
Up to 3 x FPS-T1U racks with up to 8 x FPS1000 installed units of the same output voltage rating can be connected in parallel. The built-in Oring diodes on the main output and on the +12V auxiliary voltage in each FPS1000 unit allow N+1 operation. By connecting the CS signal between the paralleled units, automatic current balance is achieved, with +/-10% accuracy. For input voltages less than 100Vac, maximum output Power derated by 10% of the Power rating. Refer to Fig 20-1 for output Power derating in parallel operation.
%of rated Power
100 
90
| | | Input voltage |
| | 265 |
85 | 100 | (Vrms) |
Fig 20-1
20.1.1 Parallel operation with Remote sensing
Fig 20-2 shows typical connection of parallel operation with Remote sensing. The CS signal wires should be as short aspossible and with the same length.
J1(A)-10
CS
J1(B)-10
CS
J1(C)-10
CS
FPS-T1U | | +V | | +S |
| +S | |
| | | | |
FPS-1000 Module A | -S | | -S |
| | | -V | |
| | | | |
| | | | | +S |
| | | +V | +S | +V |
| | | +S | |
FPS-1000 Module B | | LOAD |
-S | |
| | | -S | |
| | | -V | -V |
| | | |
| | | | | -S |
FPS-1000 Module C | | | |
| | | +V | +S | |
| | | +S | |
| | | | |
ON/ | ON/ | ON/ | -S | | |
OFF_1 | OFF_1 | OFF_1 | -S | |
A | B | C | -V | |
| | | | |
J1(A)-3 | J1(A)-12 | J2(B)-3 | J2(B)-12 | J3(C)-3 | J3(C)-12 |
Fig 20-2 Parallel operation with Remote sensing
