36 Chapter 5 Maintenance
Liebert ITA 16kVA/20kVA User Manual
Chapter 5 Maintenance
This chapter focuses on the UPS maintenance, including the fan maintenance, battery maintenance, UPS cleaning,
UPS state check, UPS function check.
5.1 Fan Maintenance
The UPS fans are expected to run for 20000 hours ~ 40000 hours continuously. The higher the ambient temperature,
the shorter the fan life is. During the UPS operation, please verify the fan status once every half year by confirming
that air blows out from the ventilation holes on the rear panel.
5.2 Battery Maintenance
The internal battery module of the UPS is sealed, lead-acid, maintenance-free battery. The battery life depends on
the ambient temperature, charge and discharge times. High ambient temperature and deep discharge shortens the
battery life.
To ensure the battery life, it is required to:
z
Keep the ambient temperature between 15°C and 25°C.
z
Prevent small current discharge. Continuous battery operation time exceeding 24 hours is strictly prohibited.
z
Charge the battery for at least 12 hours, if the battery hasn't been charged for three months at specified ambient
temperature, or two months at high ambient temperature.
Note
1. Never short circuit the battery terminals, which will result in fire.
2. Never open the battery, as the electrolyte is harmful to human body. In the event of inadvertent contact of the electrolyte, wash
the affected area immediately with plenty of clean water and go to see the doctor.
5.3 Cleaning UPS
Clean the UPS periodically, especially the ventilation holes, to ensure free airflow inside the UPS. If necessary, clean
the UPS with a vacuum cleaner. Confirm that the ventilation holes are unobstructed.
5.4 Checking UPS State
It is recommended to check the UPS operation status once every half year.
Procedures are as follows:
1. Check if the UPS is faulty: Is the FAULT indicator on? Is the UPS giving any alarm?
2. Check if the UPS is operating in Bypass mode: Normally, the UPS operates in Normal mode; if it is operating in
Bypass mode, find out the reason, such as operator intervention, overload, internal fault, and so on.
3. Check if the battery is discharging: When AC mains is normal, the battery should not discharge; if the UPS
operates in Battery mode, you should find out the reason, such as mains failure, battery test, operator intervention,
and so on.
5.5 Checking UPS Functions
Note
UPS functions check procedures may cause power interruption to load!
