Xtreme Power Conversion Corporation
E90 Service Manual
Page 35
Uninterruptible Power Supply
Focus on the following aspects:
1) If the battery surface is clean, the appearance is damaged, deformed and leakage;
2) Check if the connection among battery is reliable, if the screws are tightened, if there is corrosion and confirm
that all battery terminals are coated with insulating material;
3) Check if there at least 10mm interval between the vertical side of the battery to ensure the free flow of the air
around the battery;
4) At least 150mm space should be left between battery top and upper frame for monitoring and maintenance of
the battery;
5) Check if the battery cabinet or battery rack installed reliably, if there is good grounded. One cable must be
individually connected between battery breaker box and UPS;
6) About connections between battery pack and UPS, battery and battery, battery pack and battery pack and
rated capacity of breaker, please refer to the user’s manual and relevant specifications;
7) Check if the wiring is reasonable and the cable is not in contact with any sharp edges of objects;
8) If the battery cabinet is installed on a raised floor, the battery power cable and breaker controlled cable can
route through the floor; if the battery cabinets are side-by-side and installed on a solid floor, cables can go into
the outlet holes at the bottom of the cabinet side to connect the battery cabinets;
9) Check and confirm that the cables are correctly and safely connected to the battery terminal blocks of the
UPS. Don’t reverse the battery. About the terminal block diagram, please refer to the user’s manual.
10) Make sure that the battery breaker box is switched off.
UPS maintenance
Guidelines for good service
The UPS is almost maintenance-free and is designed to have a failure rate less than 1% a year.
Periodical service is only needed for the fans; the UPS has a low heat generation.
A battery change after 3-6 years can be expected and, apart from the service to the fan, it should normally be the
only service done to the unit.
Due to the size of the UPS and the highly complex of the PCB, board level repair is not recommended, take the
following measures instead:
Improve the reliability of the design;
Replace the PCBA;
Security conditions
Warning:When the UPS is operating, all the electronic parts connected directly to the power supply and all
internal components including the battery exist high voltage. Even disconnected from the power supply, all
internal parts including the battery still have dangerous voltage (except the communication output) .
Only authorized professionals with relevant knowledge can open the machine, the others cannot open it for
maintenance.
For authorized service personnel:
Do not work alone, a second person should be standing by to assist and render help in case of accident.
Danger may occur only during the installation and maintenance. Any person operating in a normal manner is
safe.
If the UPS is in need of repair, the process A operation is recommended(This is completely safe) :Disconnect
all input power supply and battery. Load is allowed to turn off for process A. The specific steps can be seen in
chapter 3.
If the load is not allowed to turn off, please enter the maintenance bypass mode for maintenance. Follow the
process B (refer to chapter III for specific information) . Please note that the do the maintenance in maintenance
bypass mode is not absolutely safe, Part of circuits are still at work.
In maintenance mode, the load is directly connected to the power via the bypass, so the UPS will not provide any
protection.