DC PSUs and supplying DC power to the chassis
The DC version of the FortiGate-7040E chassis front panel comes with three hot swappable 48-72V to 12V 125A DC PSUs. Each PSU has a Internal 60A/170VDC fast blow fuse on the DC line input.
At least three PSUs (power supplies 1, 2, and 3) must be connected to power. The fourth power supply is a backup power supply and provides 3+1 redundancy. See FortiGate-7040E back 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.
Each PSU is designed to be installed in a Telecom data center or similar location that has available -48VDC power fed from a listed 40A circuit breaker. To improve redundancy you can connect each power supply to a separate power circuit.
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. Make sure DC terminal rings are securely and safely fastened to the PSU terminals.
DC PSU (power connector cover removed)
DC terminals accept UL approved ring terminals for 8/M4 stud with ext ring diameter < 9.8 mm. DC cables must be a minimum of 8 AWG. Each PSU ships with a set of two 8 AWG DC power cables and six extra DC terminal rings. The cables are 3 meters (9.84 ft.) long. You can use the DC terminal rings to make custom DC cables.
PSU Power ratings
Max Inrush Current | 50A |
Max Inrush Current Duration | 200ms |
Input Voltage | -40V to -72V |
Input Current | Average: 12.5A@48V for each PSU, Max: 44A |
PSU LED States
State | Description |
---|---|
Off | DC power not connected. |
Flashing Green | The PSU is in standby mode, not supplying power to the chassis. |
Green | Normal Operation with DC power connected. |
Amber | Input voltage outside of normal operating range, PSU fan not operating, or output voltage outside of normal operating range. |
Flashing Amber | Warning that power input or output is close to outside of normal operating range. PSU should be replaced. |