GE Multilin D400 Instruction Manual page 168

Before You Remove
the Power Supply...
To replace D400
power supply units
168
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.
The D400 power supplies do not contain user replaceable fuses. The entire power supply
module must be replaced if the fuse has failed.
Figure 69: D400 Power Supply Unit
ower Supply
Slot 1
Power Supply
Slot 2
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 "Power connections" on page 82.
Dangerous voltages may be present after the power supply chassis has been removed
from the D400. Wait 10 seconds for stored energy to dissipate.
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 thumb 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. While pressing the power supply module panel against the chassis frame, hand-
tighten the two thumb screws (applying a torque of no more than 5.8 in-lb [0.66 Nm])
on the front panel.
6. Verify that the Power LED is illuminated on the replaced power supply unit.
GE INFORMATION
CHAPTER 13: SERVICING THE D400
D400 SUBSTATION GATEWAY INSTRUCTION MANUAL