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8 Replacing Parts
8.1 Replacing the MDU
Prerequisites
Tools: Phillips screwdriver, key to the cabinet door
Materials: a new and intact MDU
The MDU can be replaced online without cutting off the power supply to the SmartLi.
Before the replacement, ensure that the load services are not affected or obtain written
consent from the customer.
Procedure
Step 1 Remove the communications cable from the MDU and mark the connection position.
Step 2 Remove the four screws from the MDU using the Phillips screwdriver and set them aside.
Step 3 Hold the MDU front panel by one hand, and push out the MDU from the fastener on the front
panel by the other hand.
Step 4 Install the new MDU and secure it.
Step 5 Reinstall the communications cable to the new MDU.
Step 6 After replacement and during startup, the MDU automatically checks whether its
configurations are consistent with the rack configuration. If inconsistent, the MDU displays a
synchronization dialog box.
If you click OK, the configurations will be synchronized, and the MDU automatically
restarts.
If you click Cancel (not recommended), the configurations will not be synchronized, and
the MDU displays the same dialog box during the next startup.
If the Version incompatible alarm is generated, you need to upgrade the version before turning on the
battery circuit breaker.
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