Xtreme Power Conversion Corporation
E91 User’s Manual
Page 50
Uninterruptible Power Supply
5. Storage and Maintenance
5-1. Storage
Before storing, charge the UPS at least 7 hours. Store the UPS covered and upright in a cool, dry location. During
storage, recharge the battery in accordance with the following table:
Storage Temperature
Recharge Frequency
Charging Duration
-25°C - 40°C
Every 3 months
1-2 hours
40°C - 45°C
Every 2 months
1-2 hours
5-2. Maintenance
The UPS system operates with hazardous voltages. Repairs may be carried out only by qualified
maintenance personnel.
Even after the unit is disconnected from the mains, components inside the UPS system are still connected
to the battery packs which are potentially dangerous.
Before carrying out any kind of service and/or maintenance, disconnect the batteries and verify that no current
is present and no hazardous voltage exists in the terminals of high capability capacitor such as BUS-capacitors.
Only persons who are adequately familiar with batteries and with the required precautionary measures
may replace batteries and supervise operations. Unauthorized persons must be kept well away from the
batteries.
Verify that no voltage between the battery terminals and the ground is present before maintenance or
repair. In this product, the battery circuit is not isolated from the input voltage. Hazardous voltages may occur
between the battery terminals and the grounding/earthing.
Batteries may cause electric shock and have a high short-circuit current. The following precautions should
be observed when working on batteries:
a) Remove watches, rings, or other metal objects.
b) Use tools with insulated handles.
c) Wear rubber gloves and boots.
d) Do not lay tools or metal parts on top of batteries.
e) Disconnect charging source prior to connecting or disconnecting battery terminals.
f) Remove battery grounds during installation and maintenance to reduce likelihood of shock. Remove the
connection from ground if any part of the battery is determined to be grounded.
When replace the batteries, install the same number and same type of batteries.
Do not attempt to dispose of batteries by burning them. This could cause battery explosion. The batteries
must be deposed according to local environmental regulations.
Do not open or destroy batteries. Escaping electrolyte can cause injury to the skin and eyes. It may be
toxic.
Please replace the fuse only with the same type and amperage in order to avoid fire hazards.
Do not disassemble the UPS system.
