PRO801S/1phase-1phase/Master/introduction

Master Series (1P/1P) – TOWER
PRO801S / PRO801L / PRO8015S / PRO8015L
1 KVA - 1.5 KVA
Version 1.00

For all series of UPS, they are strictly tested and carefully designed. We always do our best to make our products more reliable and safer; this is also the goal of our company. However, due to the lifetime of electrical components and some unpredictable reasons, there will be unavoidable failures of this UPS. If this situation occurs, service of qualified person is needed.
 

This service manual will guide the technicians to repair and adjust a problematic UPS. If the UPS still does not work properly, please contact with us and we will be glad to solve any problems you met. Because of the following unique features of this series UPS (Uninterruptible Power System), it is very easy to maintain and service.
* All major power components are put on PCB.
* All PCBs are interconnected with connectors.
* Major parts are simply connected with flexible insulated wires and plugs.

This service manual consists of 4 major parts:
1. Introduction.
2. Principle of operation: It describes the functions and principles of each part.
3. Alignments: It describes the locations and methods needed to adjust this UPS.
4. Trouble shooting: This part describes the possible failure conditions and procedures to
repair it. Before starting to serve this UPS, be sure to read this manual carefully for a correct and safe operation.

II. PRINCIPLE OF OPERATION
This PRO801(S/L)_1KVA & PRO8015(S/L)_1.5KVA high input power factor UPS system contains two major PCB assemblies. They are including:
1. PSDR: contains major parts of 
- (1) charger, 
- (2) DC power supply, 
- (3) unit power factor correction, 
- (4) DC-DC converter, 
- (5) inverter and 
(6) output circuits.

2. CNTL : contains major parts of protection, 
- signaling circuits, 
-  regulation and 
- control circuits of inverter. 

The simplified schematic in Figure 1 shows how the major circuits are connected and illustrates the overall system functions.

The block diagram in Figure 3, shows the " UPS at Normal Operation"  from left to right. When a protection circuit is triggered or a condition occurs, the output supply is transferred immediately from inverter to AC mains by a bypass relay. The operation principle will be explained in later section. Basically, this ON-LINE UPS system utilizes high frequency PWM techniques to achieve high efficient performance. This UPS can deliver a clean, regulated sine-wave output at any load under full load. The sub-systems are described as below :

1.POWER STAGE (PSDR)
As shown in figure1, the power stage consists of charger, unit power factor correction, DC
power supply, DC-DC converter, inverter and output circuits.
1-1 Charger Sub-System :The purpose of charger is to charge and to maintain the batteries at full charged condition. Refer to figure 4, the voltage flyback switching power supply provides a constant DC voltage (42.4Vdc ) for batteries. Besides providing constant voltage, the power supply also limits the current flowing into batteries and therefore protects and prolongs the life time of charged batteries.