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D400 Substation Data Manager User's Manual  

 

The power supply module is accessible and easily replaced from the D400 front panel. 
The D400 may be supplied with an optional redundant power supply (in Slot 2) to provide 
dual hot swappable power supplies. If the D400 contains dual power supplies, you can 
replace one power supply unit without having to power down the D400, as long as the 
other power supply unit is operational. 
Note: The D400 power supplies do not contain user replaceable fuses. The entire power 
supply module must be replaced if the fuse has failed. 

 

Note the following items before you begin power supply replacement. 
•  Ensure the other power supply unit (if available) is functioning (the green Power LED is 

illuminated) to ensure that the D400 doesn’t power down during replacement. 

•  Make sure that the unit is wired in accordance with section “5.2 Power Connections”.  

1. 

If only a single power supply unit is installed (in Slot 1), power down the D400. If dual 
power supplies are installed (in Slot 1 and Slot 2), ensure that the secondary unit is 
functioning. 

2. 

Hand-loosen the two screws on the front panel of the power supply unit. 

3. 

Pulling on the handle, slide the power supply unit out of the chassis. 

4. 

Slide the new power supply unit into the chassis. 

5. 

Hand-tighten the two screws on the front panel. 

6. 

Verify that the Power LED is illuminated on the replaced power supply unit.