Both internal supplies have over-current, over-temperature, and over-voltage protection, as well as integrated fans. Hot swapping is allowed, taking into account that disconnecting the power supplies may interrupt PoE operation.
An external power shelf, the HP ProCurve Switch zl Power Supply Shelf, is available to house up to two switch zl power supplies. The power shelf supplies can be connected to one or two switch zl’s to provide additional PoE power, either to power additional PoE-powered devices, or to provide more power for PoE power redundancy. The supplies in the power shelf are connected to the switch(es) via one or two 2m EPS cables. The PoE power provided is added to the internal power supply PoE power to figure the total amount of PoE power to the ports in the switch.
While the connectors on the EPS connector cable will fit the connectors on the 3500 switches, no power will flow from the power shelf. Extra PoE power for the 3500 switch can be obtained with the HP ProCurve 620 Redundant/External Power Supply.
Fan tray
The fan tray assembly contains the cooling fans for the interior of the 5400zl series chassis, but excludes the chassis power supplies, which have their own internal cooling fans. The 5406zl fan tray consists of 2 variable-speed fans, and the 5412zl fan tray consists of 4 variable-speed fans. The fan speed is based on the sensed ambient temperature of the chassis.
The fan tray is mounted on the left side of the chassis (from a front-view perspective), and the fans draw air through ventilation holes to the left and blow the air out through ventilation holes to the right (side-to-side airflow).
The fan tray is hot-swappable in the 5406zl and 5412zl. It can be removed and replaced without removing power from the switch. However, the new fan tray should be installed immediately after removing the old fan tray to avoid overheating and automatic switch shutdown within three minutes.
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