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Chapter 1 Introduction

1.3.3 Communication Functions

The controller can communicate with the host computer in three modes: RS232, Modem, and Ethernet (WEB and

SNMP). It can communicate with the rectifiers in CAN-bus mode.

When the DC power system is in alarm status, the controller generates an alarm automatically and reports the alarm

to higher level controller according to actual requirements. The controller records the history alarm and a user can

query history alarm through the controller.

The alarm contents include communication failure, SPD fault, DC over/under voltage, load disconnection, battery

disconnection, BLVD, battery/ambient temperature abnormal, and rectifier alarm. The controller has four different

alarm categories.

1. CA, Critical Alarm

2. MA, Major Alarm

3. OA, Observation Alarm

4. None

User can set the alarm category for each alarm. User can also block all outgoing alarms from reporting to remote

computer and affecting any relay. This function can be programmed to reset automatically after 24 hours. When

outgoing alarms are blocked, an 'Outgoing Alarms Blocked' alarm is generated.

Battery test

The purpose of a battery test is to check the condition of the battery. This test discharges the battery and monitors

battery voltage and current.

During a battery test, the controller reduces rectifier output to a predefined value and the battery supplies the load

and begins to discharge. The controller monitors the battery and saves the result in a battery test log.

The controller has two separate battery tests: full load current test and stable current test.

Below are the requirements of the full load current test and stable current test.

The test can be programmed to start under the following conditions.

1. Manual start

2. Cyclic start after a predefined time schedule

Starting a full load battery test or stable current is determined by the discharge current parameter of the stable current

test, as illustrated in Figure 1-2.

Battery boost charge

When the batteries have been discharged, the controller can raise system voltage to recharge the batteries quicker,

as illustrated in Figure 1-3. The boost charge function can also be used to equalize the difference between the

different battery blocks/cells.

Figure 1-2 The Principle of Battery Test

LCU+ Series Controller User Manual