Operator`s manual

63 5 Maintenance
5.4 Replacing the Internal Batteries (Continued)
Tools and Materials Required:
• Phillips Screwdriver.
•
7
/16 and
3
/8 inch wrenches for the battery connectors.
• DC Voltmeter.
Step 1: Remove the Front Panel and the Cover
Procedure:
1
Switch off the Input and Battery circuit breakers.
2
Do not disconnect the unit from line power (See Step 2).
3
Disconnect all loads.
4
If an external battery pack is connected, disconnect it.
5
Loosen the two Phillips screws on the front panel.
6
Carefully pull the lower part of the front panel away
from the unit and then lift it up and away.
TIP: The display panel is attached to this panel. Do
not damage or disconnect the ribbon cable con-
necting it to the unit.
7
Unscrew the five screws on each side of
the cover.
8
Lift the cover upward and away from the
chassis.
DANGER: Make sure the cover does
not touch the batteries or any internal
components.
Panel and Cover Removal Finished