Variadores De Velocidad

CARASTERISTICAS DIFERENCIALES VARIADORES “FDU”

1. Sistema “ELFI” integrado: Este equipo patente de Emotron, es único en el Mercado el cual protege a la bomba y la aplicación por problemas mecánicos que surgen debido a cavitacion, válvulas montadas incorrectamente o cualquier problema mecánico. Con el sistema “ELFI” monitorea constantemente el torque y de acuerdo a las curvas de la bomba especifica parámetros de pre-alarma y alarma en caso de que estos problemas ocurran. Tiene una precisión de 2 a 4% del torque.

2. Sleep and Awake Mode

3. Virtual connections

4. Sensorless Control en Combinación con el PID

5. Pump Control hasta 7 bombas (No necesidad de PLCs

6. Load Monitor

7. Protecciones para el motor

8. Gabinete IP54 que con nuestro equipo la necesidad de incluirlos en gabinete es nula (asta VDF de 132KW). El equipo se instala cerca del motor evitando los altos costos de cableado y gabinetes adicionales.

9. Comunicaciones

10. EMOSOFT Para calculo y monitoreo del variador por PC

Engineering Report

Installation of Emotron MSF Soft Starters to (4) Kobelco KNW Series Air Compressors

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PEMEX AKAL BRAVO Oil Platform

Mexico

January 10th to 15th 2004

Author: Paul Hackett – Emotron Inc.

1. Project overview

In December 2003, Impulsora Zeus of Garcia, Mexico purchased from Emotron (4) MSF 310 Electronic Soft Starters for installation to each of (4) existing 250 HP Kobelco KNW Series Air Compressors at the PEMEX AKAL BRAVO Oil Platform in the Gulf of Mexico.

The purpose of this installation was to address the unacceptable situation concerning motor failures. It is generally agreed that these motors have been failing due to heat related issues – almost certainly caused by the high inrush current when starting across the line and also by the number of starts per hour.

2. In-rush current with Across the Line starting

An Across the Line starter configuration will allow the in-rush current to reach to 6 to 8 times the motors Full Load Amps which, for this application was 262 Amps. After installing the MSF, it was noted that an Across the Line start (setting Menu 25 to OFF and 24 to ON) resulted a start up current of 1,693 amps. Frequent starting across the line causes an extreme build up of heat within the motor – often resulting in premature failure.

3. Emotron MSF Soft Starter

The MSF is a highly advanced electronic soft starter that controls the starting torque over a preset time period. Controlling the torque greatly differs from the conventional Reduced Voltage soft starting method inasmuch as it not only provides an extremely smooth, linear speed ramp but also offers a further (and significant) reduction in the in-rush current. In this installation, the MSF reduced the starting current to a maximum of 1,067 amps.

In addition to the above benefits, the MSF also offers a combination of many advanced features that are not found on any other electronic soft starter, e.g.,

• Jog (14% motor speed in a forward direction and 9% in reverse)

• Locked Rotor detection

• Shaft Power monitoring and protection

• Supply voltage monitoring

• Phase loss / reversal protection

• Temperature monitoring of Soft Starter and motor

etc.

After careful consideration and discussion with the PEMEX Engineers, it was agreed that most of these advanced features would be turned on in order to utilize the full benefits available from the MSF

4. Installation of MSF

The MSF’s are installed directly to the incoming 460 VAC 3 phase supply from the MCC panel - the original source utilized by the Across the Line Starter. The output of the MSF is directly connected to the motor. As seen in the following photographs, the MSF’s are installed to the end of the MCC panels.

Note: At the point that these photographs were taken, only (2) of the (4) units were installed.

In order to accommodate the MSF’s capability to electronically start the motor across the line, all incoming and outgoing conductors to and from the MSF comprised two 3/0 cables per phase.

A magnetic motor starter was not installed to the Compressor motor.

In order to address the high humidity present in the vicinity of the compressors, each of the Baldor motors comprised a heater – which was required to be activated when the motor was stopped. It was agreed that the MSF’s K1 relay along with external relay logic would be used to achieve this.

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5. MSF Commissioning (set up)

The following parameters were set on the MSF.

Note: If a parameter is not detailed below, it was left at its default value.

5.1 Motor Parameters

See Page 50 of the Instruction Manual

5.2 Start Ramp time

See Page 36 of the Instruction Manual

5.3 Starting method

See Page 42 of the Instruction Manual

5.4 Torque Ramp settings

See Page 39 of the Instruction Manual

5.4 Setting of Programmable Relays K1 and K2

K1 setting:

5.6 Motor Overload Protection

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