2. 3 Operating Principle
Figure 2-3 The UPS operating principle
1. Input filter: it filters the input and provides clean AC power to the UPS.
2. AC/DC converter: In Normal mode, it converts the AC input power to regulated DC power, and raises the
regulated DC voltage for DC/AC converter.
3. DC/DC converter: Raises the DC Voltage from the battery system to the optimum operating voltage for the
inverter when the UPS operates in Battery mode.
4. DC/AC inverter: In Normal mode, it utilizes the DC output of the AC/DC converter and inverts it into precise,
regulated sine wave AC
power. In Battery mode, it receives energy from the battery through the DC/DC
converter.
5. Bypass: It is very important in the UPS system. In the event of a UPS fault that will not lead to UPS
shutdown, the load will be automatically transferred to the bypass. Meanwhile, the LED indicators will
indicate the fault type, and the fault information will be reported through the communication ports.
6. Charger: The charger of standard UPS provides 1A charging current; and long backup time provided 1K is
6.5A and 2K/3K is 5.5A charging current.
7. Battery: Sealed maintenance-free lead –acid battery can be used as the DC source of the UPS.
8. Output filter: It filters the output and provides clean AC power to the load.
3. Installation
3. 1 Unpacking Inspection
1. Open the packing box of UPS and take it out, visually examine the unit for transit damage.
2. Check against the accessory lists that the accessories of the UPS are present. (Refer to Table 8-1).
3. Make sure the model is what you wanted from the nameplate on the rear panel.
4. If the UPS arrives damaged, or there is any missing accessory or other question above, please contact the
distributor immediately.
3. 2 Installation Notes
1. When locating the UPS, make sure there is no hazardous objects such as water, inflammable gas, corrosive
agents and so on around the UPS, and that the installation environment meets the specifications.
2. The UPS should not be placed on a side. The air inlet port at the front panel and the outlet port on the rear
panel and two side panels should not be blocked so as to ensure good ventilation.
3. In case if the UPS is unpacked, installed and used at very low temperatures, condensations of water drops
may appear. It is necessary to wait until the UPS fully dried inside out before proceeding to installation and use.
Otherwise, they may be a risk of electric shock.
4. Place the UPS near the utility power source outlet which supplies power to the UPS. In any emergency,
switch off the main input socket, cut off the battery voltage input. All power sockets must be connected with
ground protection.