Specifications

Replacing Power Components (SSG 550 Only) 51
Servicing the Device
2. Using both hands, slide the PSU into the chassis until you feel resistance.
3. Firmly push the power supply into the chassis until it comes to a stop. Make
sure that the PSU is flush with any other adjacent PSU.
4. Attach the feed wires to the terminal block.
5. Tighten the retaining screws on the terminal block.
6. See “DC Power” on page 23 before turning on the current to the DC PSU.
Replacing an AC Power Cord
To replace the AC power cord for a redundant power supply:
1. Locate a replacement power cord with the type of plug appropriate for your
geographical location.
2. Attach an ESD grounding strap to your bare wrist, and connect the strap to the
ESD point on the device.
3. Unplug the power cord from the power-source receptacle.
4. Unplug the power cord from the appliance inlet on the power-supply faceplate.
5. Insert the appliance-coupler end of the replacement power cord into the
appliance inlet on the power-supply faceplate.
6. Insert the power-cord plug into an AC power-source receptacle.
7. Verify that the power cord does not block access to device components or
drape where people might trip on it.
WARNING: Before installing a DC power supply, you must shut off current to the
DC feed wires that lead to the power supply.
CAUTION: Ensure that the DC cables do not touch the two screws on the chassis
that are adjacent to the terminal block. Contact between the DC cables and the
chassis screws will cause a circuit failure.
NOTE: Each power supply must be connected to a dedicated AC power feed.