Replacing a Power Module

This section describes how to replace a faulty power module.

Context

When two power modules are installed on the USG, one of them is hot swappable. Pay attention to the following items during hot swapping:

Power off the power module to be replaced.
Do not power off the other power module during the replacement.
Do not touch the other power module either by body or by tools, preventing human injury or device short circuit.
DC and AC power modules are incompatible with each other and cannot be used in substitution.

Tools

ESD wrist strap

Replacing the Power Module

Determine the location of the power module to be replaced and attack a replacement label on the panel to identify the power module.
Disconnect the power supply device from the power module to be replaced.
Wear an ESD wrist strap.
Remove the power cable connected to the power module.
Refer to the following instructions to remove the power cables:
- To remove the AC power cable:
  1. Press the baffle on the cable retention clip and remove the cable retention clip from the AC power cable. (Skip this step if the power module does not have any cable retention clip.)
  2. Pull out the power cable from the socket on the power module.
- To remove the DC power cable:
  1. Remove the fastening screws from the OT terminals of the DC power cable.
  2. Pull out the power cable from the socket on the power module.
Replace the power module.
The methods to replace the DC power module and the AC power module are the same. The following uses AC power module replacement as an example.
1. Press the cable retention clip of the power module to the right, hold the front panel of the power module, and pull out the power module.
2. Note down the cause and time of the replacement as well as the bar code of the replaced power module and then put away the replaced power module.
3. Take the new power module from the packing box and check whether its model is the same as the replaced one.
4. Gently push the new power module into the chassis along the power slot. After the latch on the power module is tightened, pull the power module gently to check whether it can be removed.
5. Connect the power cable to the socket on the new power module. For details, see Connecting AC Power Cables (for a 420 mm Deep Device) or Connecting AC Power Cables (for a 600 mm Deep Device).
  Figure 1 Replace the power module
6. Switch on the power supply device. If the STATUS indicator on the new power module of the USG6000E is steady green, the power module works properly.

Follow-up Procedure

After replacing the power module, collect all tools. If the replaced power module is faulty, fill in the Repair Transmission Sheet and send the faulty module with the Repair Transmission Sheet to the equipment supplier or the specified repair service provider.