Danfoss VACON NXP DCGuard Operating guide

Operating Guide

VACON® NXP DCGuard™

Operating Guide | VACON® NXP DCGuard™

Contents

Contents

1 Introduction 5

1.1 Purpose of this Operating Guide 5

1.2 Additional Resources 5

1.3 Manual Version 5

1.4 Disposal 5

1.5 Type Approvals and Certifications 5

2 Safety 7

2.1 Safety Instructions 7

3 Product Overview 8

3.1 Intended Use 8

3.2 Application Functionality 8

3.3 Protection Functions 8

3.4 Controlled Voltage Ramp-Up 9

4 Electrical Installation 10

4.1 Cabling 10

4.1.1 Wiring Diagrams for Air-Cooled Inverter Units 10

4.1.2 Wiring Diagrams for Liquid-Cooled Inverter Units 13

4.2 Terminal Definitions 16

4.2.1 Terminal Locations in Air-Cooled Inverter Units 16

4.2.2 Terminal Locations in Liquid-Cooled Inverter Units 19

5 Control Unit 23

5.1 Control I/O Configuration 23

6 Parameter Settings 25

6.1 Setting the Parameters for the Application 25

6.2 Basic Parameters 25

6.3 Instant Current Cut-Off 26

6.4 Rapid Current Cut-Off 26

6.5 High Current Cut-Off 27

6.5.1 Parameter Settings for High Current Cut-Off 27

6.5.2 U Phase Current Protection 28

6.5.3 V Phase Current Protection 28

6.5.4 W Phase Current Protection 29

6.6 Over Load Protection 30

6.6.1 Function Description 30

6.6.2 U Phase Over Load Protection 31

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Operating Guide | VACON® NXP DCGuard™

6.6.3 V Phase Over Load Protection 31

6.6.4 W Phase Over Load Protection 32

6.7 Controlled Voltage Ramp-Up 33

Contents

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Operating Guide | VACON® NXP DCGuard™

Introduction

1 Introduction

1.1 Purpose of this Operating Guide

This operating guide provides information for the installation and operation of the VACON® NXP DCGuard™ application. It is intended
for use by qualified personnel. To use the drive safely and professionally, read and follow the instructions. Pay particular attention to
the safety instructions and general warnings. Always keep this operating guide available with the drive.

1.2 Additional Resources

Other resources are available to understand advanced AC drive functions, programming, and options.

• The VACON® NXP DCGuard™ design guide provides technical information to understand the capabilities of the VACON® NXP
DCGuard™ application.

• The VACON® NXP DCGuard™ application guide provides greater detail on how to work with the application software and how to
set the parameters of the AC drive modules.

• VACON® NXP Common DC Bus and VACON® NXP Liquid-cooled Common DC Bus user manuals provide detailed information for the
installation, commissioning, and operation of the AC drive modules.

• The operating and installation guides for VACON® options give detailed information about specific drive options.

Supplementary publications and manuals are available from Danfoss. See www.danfoss.com for listings.

1.3 Manual Version

This manual is regularly reviewed and updated. All suggestions for improvement are welcome.

The original language of this manual is English.

Table 1: VACON® NXP DCGuard™ Operating Guide Version

Version Release date Remarks

B 25.10.2018 Product name update

1.4 Disposal

Context:

Do not dispose of equipment containing electrical components together with domestic waste. Collect it separately in accordance with
local and currently valid legislation.

1.5 Type Approvals and Certifications

VACON® NXP DCGuard™ is type approved as a circuit breaker/DC-bus tie breaker. For a list of the approvals and certifications, see the
VACON® NXP DCGuard™ product page at www.danfoss.com.

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Operating Guide | VACON® NXP DCGuard™

NOTI CE

VACON® NXP DCGuard™ acts as a protection device in a DC power distribution system. Separate approvals as a DC-bus tie
breaker can be required.

Introduction

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Operating Guide | VACON® NXP DCGuard™

Safety

2 Safety

2.1 Safety Instructions

A safety guide is included in the product delivery. Read the safety instructions carefully before starting to work in any way with the
system or its components.

The warnings and cautions in the safety guide give important information on how to prevent injury and damage to the equipment or
the system. Read the warnings and cautions carefully and obey their instructions.

The product manuals with applicable safety, warning, and caution information can be downloaded from https://www.danfoss.com/en/

service-and-support/.

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Operating Guide | VACON® NXP DCGuard™

Product Overview

3 Product Overview

3.1 Intended Use

Utilizing DC grids rather than AC grids enables power distribution with lower power losses. However, there are few or no international
standards for building a DC grid, especially in marine applications. Short circuit handling is a challenge in DC grids and it is difficult to
ensure the required system functionality by using fuses. Ensuring selectivity and limited short circuit energy requires more
sophisticated protection devices.

Danfoss has therefore developed the VACON® NXP DCGuard™, a semiconductor protection device that can detect and cut off any DC
fault currents and isolate the faulty part of the DC grid power distribution system in microseconds.

3.2 Application Functionality

VACON® NXP DCGuard™ is a fast DC current cutter device that detects and cuts off an outgoing short-circuit current. The main
function is to isolate the faulty DC bus from the healthy DC bus, before that fault affects the healthy DC bus.

Two inverter units in a DCGuard peer-to-peer topology are required to be able to cut off short-circuit current both ways.

VACON® NXP DCGuard™ consist of VACON® NXP inverter units and application software ADFIF102. To ensure the correct functionality
and safety level, always use the following components together with the DCGuard in a peer-to-peer system:

• An upstream mechanical disconnector if safe disconnection is required.

• Type aR supply fuses in each DC supply line (see the VACON® NXP DCGuard™ design guide for instructions).

• A dU/dt filter (a standard VACON® dU/dt filter can be used).

Illustration 1: VACON® NXP DCGuard™ Peer-to-Peer Topology

3.3 Protection Functions

The VACON® NXP DCGuard™ application has different short-circuit protection levels. The instant current cut-off is non-programmable,
but the other functions can be programmed. The protection functions also have separate programmable responses.

Instant current cut-off

•

Non-programmable

• Handled by VACON® NXP hardware at μs level.

• Fault: F1

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Over load detection

Short-circuit protection

Operational area

Current

Time

Nom. current

Instant trip

Instant current cut-off
Rapid current cut-off
High current cut-off

Bus tie cables over load protection

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Operating Guide | VACON® NXP DCGuard™

Rapid current cut-off

• Programmable

• Requires sufficient inductance in the output filter

• Handled by the system software at 50–100 μs level

• Faults: F63, F64, and F65

High current cut-off

• Programmable

• Handled by the application software at 100 ms level

• Faults: F86, F87, and F88

Over load detection

• Programmable

• Handled by the application software at 100 ms level

• Faults: F83, F84, and F85

Product Overview

Illustration 2: VACON® NXP DCGuard™ Safety Layers

3.4 Controlled Voltage Ramp-Up

Controlled voltage ramp-up is a programmable function of the VACON® NXP DCGuard™ application. The DCGuard performs a
controlled ramp-up of the voltage in the bus tie cables before closing. This functionality powers up the DC link of the peer-to-peer
connection during start-up of the system. The recommended controlled voltage ramp-up time is 200–400 ms.

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Operating Guide | VACON® NXP DCGuard™

Electrical Installation

4 Electrical Installation

4.1 Cabling

The cabling of the VACON® NXP DCGuard™ inverter units is different depending on the unit type and nominal current of the units. See:

• 4.1.1 Wiring Diagrams for Air-Cooled Inverter Units

• 4.1.2 Wiring Diagrams for Liquid-Cooled Inverter Units

Definitions for the wiring diagrams:

Item Definition

-F Fuse, type aR. See the VACON® NXP DCGuard™ design guide for instructions on fuse selection.

-K Mechanical disconnector

-L Output di/dt filter

4.1.1 Wiring Diagrams for Air-Cooled Inverter Units

Wiring diagrams for air-cooled inverter units, 500 V (465–800 V DC):

• NXP0003–NXP0520, enclosure sizes FR4 to FI10, see illustration 3.

• NXP0590–NXP0730, enclosure size FI12, see illustration 4.

• NXP0820–NXP1030, enclosure size FI12, see

• NXP1150–NXP1450, enclosure size FI13, see illustration 6.

• NXP1770–NXP2150, enclosure size FI14, see

Wiring diagrams for air-cooled inverter units, 690 V (640–1100 V DC):

• NXP0004–NXP0416, enclosure sizes FR4 to FI10, see illustration 3.

• NXP0460–NXP0590, enclosure size FI12, see

• NXP0650–NXP0820, enclosure size FI12, see illustration 5.

• NXP0920–NXP1180, enclosure size FI13, see

• NXP1500–NXP2250, enclosure size FI14, see illustration 7.

illustration 5.

illustration 7.

illustration 4.

illustration 6.

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Operating Guide | VACON® NXP DCGuard™

Electrical Installation

Illustration 3: Basic Wiring Diagram for Enclosure Sizes FR4–FI10

Illustration 4: Basic Wiring Diagram for Enclosure Size FI12 with 1 Output Filter (only valid for 500 V NXP0590–NXP0730 and 690 V NXP0460–
NXP0590)

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