PROLINKZONE 2019: Pro901-903S ( Profesional Series)

I. INTRODUCTION
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:
I. Introduction.
II. Principle of operation : It describes the functions and principles of each part.
III. Alignments : It describes the locations and methods needed to adjust this UPS.
IV. 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

II. Principle of Operation
Tower Online UPS system contains 4 major PCB
assemblies. They are including :
1. PSDR : Contains major parts of
(1.1) DC power supply.
(1.2) DC-DC converter.
(1.3) inverter.
(1.4) Input and output circuits.
(1.5) RS232/USB communication port.

2. CNTL : Contains major parts of
(2.1) protection,
(2.2) signaling circuits,
(2.3) regulation and control circuits of inverter.

3.CHG For standard models : 1A charging current for the internal batteries.
   CHG For long run models : 8A charging current for the external batteries.

   * Note : Point (1. PSDR, 2.CNTL, 3.CHG for 1KVA/2KVA/3KVA)

4.a) PFC Provide constant Bus voltage to the Inverter in Buck and Boost mode (For 1KVA)
   b) I/O Input and output EMI filter board. (For 2KVA and 3KVA).

III. ALIGNMENTS
List below are some test points and procedures when a qualified service person wants to check whether EUT (Equipment Under Test) will works properly. Before beginning following procedures, please make sure that EUT is OFF and disconnected from Utility.