The FortiGate-7121F chassis front panel can include up to eight hot swappable 200-240V, 10A AC PSUs. The capacity of each PSU is 1800W (90% of full capacity of 2000W). See FortiGate-7121F front panel for locations of the PSUs.
The number of PSUs required by a chassis depends on the number of FIMs and FPMs in the chassis. For example, a FortiGate-7121F chassis containing two FIMs and six FPMs requires four PSUs to provide a total of 7200W. A chassis containing two FIMs and ten FPMs requires six PSUs to provide a total of 10800W. You can add extra PSUs to provide redundancy. See Power consumption for different FIM-7941F FortiGate-7121F configurations or Power consumption for different FIM-7921F FortiGate-7121F configurations.
If the chassis does not have enough power because PSUs have failed or become disconnected, the active SMM will begin shutting down FPMs starting at the highest slot number.
All PSUs should be connected to AC power. To improve redundancy you can connect each PSU to a separate power source.
Use a C15 Power cable, supplied with the chassis, to connect power to each PSU C16 power connector. C15/C16 power connectors are used for high temperature environments and are rated up to 120°C.
The PSU LED indicates whether the PSU is operating correctly and connected to power. If this LED is not lit, check to make sure the PSU is connected to power. If the power connection is good then the PSU has failed and should be replaced.