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FortiGate-7121F System Guide

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DC PSUs and supplying DC power to the chassis

The DC version of the FortiGate-7121F chassis front panel can include up to eight hot swappable -48Vdc to -60Vdc 2000W PSUs. The capacity of each PSU is 1800W(90% of full capacity of 2000W). Each PSU has a Internal 60A/170VDC fast blow fuse on the DC line input. See FortiGate-7121F front panel for locations of the PSUs. The diagram shows AC PSUs, with a DC version of the chassis the AC PSUs are replaced with DC 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-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.

Fortinet supplies a DC Combiner that you can install to provide redundant power feeds to each PSU. See Using the FortiGate-7121F DC Combiner to supply redundant DC power for the FortiGate-7121F.

Each PSU is designed to be installed in a Telecom data center or similar location that has available -48VDC power fed from a listed 80A circuit breaker. To improve redundancy you can connect each power supply to a separate power circuit.

DC PSU

If you are connecting the FortiGate-7121F to Fortinet's DC Combiner, Fortinet supplies custom DC power cables that connect the two-prong power connector on each DC PSU to the corresponding connector on the DC Combiner module front panel. The connector on each end of the cable clicks into a release tab that secures the cable into place. For more information about the FortiGate-7121F DC combiner, see Using the FortiGate-7121F DC Combiner to supply redundant DC power for the FortiGate-7121F.

If you are connecting the FortiGate-7121F directly to data center power, Fortinet supplies custom DC power cables that connect to the two-prong power connector on each DC PSU. The connector clicks into a release tab that secures the cable into place. DC terminal rings on the supplied cable must be securely and safely fastened to the your data center power supply terminals.

The supplied DC power cables are intended to be used only for in-rack wiring, must be routed away from sharp edges, and must be adequately fixed to prevent excessive strain on the wires and terminals.

PSU Power ratings
Max Inrush Current 50A
Max Inrush Current Duration 200ms
Input Voltage -48Vdc to -60Vdc
Input Current Average: 203A @ -48Vdc and 163A @ -60Vdc for each PSU

DC PSUs and supplying DC power to the chassis

The DC version of the FortiGate-7121F chassis front panel can include up to eight hot swappable -48Vdc to -60Vdc 2000W PSUs. The capacity of each PSU is 1800W(90% of full capacity of 2000W). Each PSU has a Internal 60A/170VDC fast blow fuse on the DC line input. See FortiGate-7121F front panel for locations of the PSUs. The diagram shows AC PSUs, with a DC version of the chassis the AC PSUs are replaced with DC 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-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.

Fortinet supplies a DC Combiner that you can install to provide redundant power feeds to each PSU. See Using the FortiGate-7121F DC Combiner to supply redundant DC power for the FortiGate-7121F.

Each PSU is designed to be installed in a Telecom data center or similar location that has available -48VDC power fed from a listed 80A circuit breaker. To improve redundancy you can connect each power supply to a separate power circuit.

DC PSU

If you are connecting the FortiGate-7121F to Fortinet's DC Combiner, Fortinet supplies custom DC power cables that connect the two-prong power connector on each DC PSU to the corresponding connector on the DC Combiner module front panel. The connector on each end of the cable clicks into a release tab that secures the cable into place. For more information about the FortiGate-7121F DC combiner, see Using the FortiGate-7121F DC Combiner to supply redundant DC power for the FortiGate-7121F.

If you are connecting the FortiGate-7121F directly to data center power, Fortinet supplies custom DC power cables that connect to the two-prong power connector on each DC PSU. The connector clicks into a release tab that secures the cable into place. DC terminal rings on the supplied cable must be securely and safely fastened to the your data center power supply terminals.

The supplied DC power cables are intended to be used only for in-rack wiring, must be routed away from sharp edges, and must be adequately fixed to prevent excessive strain on the wires and terminals.

PSU Power ratings
Max Inrush Current 50A
Max Inrush Current Duration 200ms
Input Voltage -48Vdc to -60Vdc
Input Current Average: 203A @ -48Vdc and 163A @ -60Vdc for each PSU