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Mecc Alte DER2 - User Manual

Mecc Alte DER2
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Technical Guide
DER2
Digital Regulator
Guida Tecnica
Regolatore Digitale DER2
The worlds largest independent
producer of synchronous
alternators 1 – 5,000kVA
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Summary

INTRODUCTION

MAIN CHARACTERISTICS

1. Architecture of the system

Describes the DER2 regulator as part of a two-component system (regulator and supervision unit).

2. Technical Characteristics

Details the digital regulator's features, power, and environmental specifications.

3. Inputs and Outputs: technical specifications

Lists and specifies the terminal connections and their functions for the regulator.

4. Block diagram

Illustrates the internal connections and signal flow within the DER2 regulator.

5. High Dynamic Response

Explains the module that allows faster reduction of excitation current for reduced transient overvoltage.

INSTALLATION

1. Overall dimensions drawings

Provides dimensional drawings and mounting information for the DER2 regulator.

2. Connections

Details the importance of correct connections and potential consequences of errors.

4. DER2 connections

Details DER2 connections for typical applications and voltage sensing.

5. Setting up the regulator

Explains how to set up the regulator using trimmers, jumpers, and software parameters.

PARAMETERS AND OPERATING DATA

1. ModBus registry list

Lists parameters, their ranges, default values, and notes for configuration via ModBus.

SETTING OF VOLT, STAB, AMP and Hz PARAMETERS

1. Voltage

Covers setting output voltage, soft start, and slow voltage variations.

2. Stability

Explains adjustment of stability and proportional/integral gain settings.

3. EXCITATION OVERCURRENT

3.1 Description

Explains the excitation temperature estimator and overcurrent protection function.

3.2 Calibration with a supervision unit

Details the procedure for calibrating overload protection using a supervision unit.

3.3 Calibration without a supervision unit

Provides steps for calibrating overload protection without supervision equipment.

4. Underspeed

4.1 Description

Explains how machine voltage is regulated proportionally to frequency below a set threshold.

4.2 Calibration with a supervision unit

Outlines the procedure to calibrate underspeed protection with a supervision unit.

4.3 Calibration without a supervision unit

Describes how to calibrate underspeed protection without supervision equipment.

5. Overspeed

6. Other parameters

6.1 Vout; Vaux Ratio

Explains voltage reduction limits as a function of frequency and parameter P[14].

6.2 V;F slope at start up

Describes how parameter P[24] sets the voltage/frequency slope during startup.

6.3 Short circuit time

Defines the operating time with the alternator short-circuited before regulator blockage.

6.4 Intervention threshold of low excitation alarm

Details the low excitation/loss of excitation alarm and its recognition via location L[56].

CONTROLLING OF REGULATOR ALARMS

1. Alarm signals with the indicator lights

Describes how indicator lights signal normal operation, intervention, and alarms.

2. Description of alarms

Details specific alarms, their causes, actions, and APO output status.

3. APO Output

Explains the APO output status and how alarms trigger it.

4. DER2 operation time

Describes how to obtain the total operation time of the regulator from alarm data.

APPENDIX

DER2 SET UP ON A TEST BENCH

Provides diagrams for functional checkout and parameter setting on a test bench.

Mecc Alte DER2 Specifications

General IconGeneral
Voltage Regulation Accuracy+/- 0.5%
Maximum Output Current7A
Frequency50/60 Hz
Output Voltage0-90V DC
Output Current7A
Humidity95% non-condensing
Operating Temperature-40°C to +70°C
Storage Temperature-40°C to +85°C
Stability±0.5%

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