Maintenance; Preventative Maintenance; Battery Maintenance - Ewent EW3941 Manual De Usuario

6
SUGGESTION: This UPS is the power supply for the computer monitor and hard disk(CD) etc. It
has the limited back time for the load, so you'd better not connect the printer or other equipment's
to it.
5. Connect to AC: press the panel switch turning on the UPS, the green LED and yellow LED
light, then you can turn on your computer etc.
6. Battery mode：press the panel switch turning on the UPS, the red LED lights, then you can
turn on your computer etc.
7. Normally turning UPS：press the panel switch turning on the UPS.
8. Normally turning off UPS：press the panel switch turning off the UPS.
Remark：
1. Generally speaking, don't turn off the UPS and keep battery charging.
2. Once AC fails, UPS will turn to battery mode, please save important documents
in time.

7.0 Maintenance

7.1 Preventative Maintenance

Preventive Maintenance ensures the longer Service life of UPS. Please check the following steps
every month：
1. Turn off the UPS;
2. Make sure the airway not blocked;
3. Make sure that the UPS surface is not covered by dust;
4. Check whether the input, output and battery connecting lines are firm or not and the insulation
is effective or not;
5. Make sure that the UPS is not affected with damp;
6. Turn on the UPS;
7. Let the UPS work in battery mode for about 5 minutes and in this period, if there is no other
alarm from the UPS, then the UPS is normal; if there is other alarm message，please contact
the local dealer for help.

7.2 Battery Maintenance

The UPS contains sealed lead-acid maintenance-free battery. The bad environment, the high
discharge frequency, the high temperature, etc will dramatically reduce the use life of battery. The
use life of battery will also reduce even it is not used. It is suggested to discharge the battery once
every 3 months when AC is normal. The following is the steps of how to check the battery: when
the battery is near the end of its life, the battery will end in bad performance. So, please remember
the following steps of checking and maintenance:
1. Connect the UPS to AC and turn on the UPS, charge the battery for at least 10 hours, noting
the load status.
2. Keep the load at that status and record the total power capacity of the load and then remove
the input plug of the UPS( simulate AC failure), and the battery of the UPS will discharge until
turn off automatically and record the discharge time. Please keep the record of the discharge
time for later check.