ABB OMD800 User guide

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INSTALLATION AND OPERATING INSTRUCTION

Automatic control unit

OMD800

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Automatic control unit

34OOMS800 rev. E / 1SCC390126M0202

AUTOMATIC CONTROL UNIT, OMD800

AUTOMATIC CONTROL UNIT, OMD800 AUTOMATIC CONTROL UNIT, OMD800

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Table of contents

1. Introduction 05

1.1 Use of symbols 05

1.2 Explanations of abbreviations and terms 05

2. Product overview 06

2.1 Typical applications 07−08

3. Description 09

3.1 OMD800 switching sequence 09

3.1.1 Line 1 priority 09

3.1.2 No line priority 10

3.1.3 Line 2 priority 11

3.1.4 Manual back switching mode 12

4. Installation 13

4.1 Dimensional drawings 13

4.2 Mounting 14

4.2.1 Door mounting 14−15

4.2.2 DIN-rail mounting 16−17

5. Connecting 18

5.1 Power circuit 18

5.2 Control circuit 19

5.2.1 Control circuit diagram OMD800 with motorized

OTM40...125_CMA_ 19

5.2.2 Control circuit diagram OMD800 with motorized

OTM160...2500_CM_ 20−21

5.2.3 OMD800 outputs 22

5.2.4 OMD800 inputs 22

6. Operating 23

6.1 Automatic control unit OMD800 in Manual Mode 23−25

6.2 Automatic control unit OMD800 in Automatic Mode 25

4AUTOMATIC CONTROL UNIT, OMD800

7. Using automatic control unit OMD800 26

7.1 Interface 26

7.1.1 Keypad 26

7.1.2 LEDs 27

7.2 Configuration 28

7.2.1 Menu browsing keys 28

7.2.2 Display 29−53

7.2.3 OMD800 communication via Modbus 53−61

8. Technical data of the automatic control unit OMD800 62

9. Troubleshooting OMD800 63−65

9.1 Explanations of internal faults OMD800 66

9.2 Change-over switch does not respond 66

9.3 Missing of both lines 66

10. Accessories 67

10.1 Fastener 67

10.2 Cover plate 68−69

AUTOMATIC CONTROL UNIT, OMD800 AUTOMATIC CONTROL UNIT, OMD800

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1 Introduction

This manual describes the installation and the basic operation of the OMD800 automatic control unit. The in-

structive part is followed by a section on available accessories.

Caution: provides important information or warns about a situation that may have a

detrimental eect on equipment.

General warning: warns about a situation where something other than electrical equipment may

cause physical injury to a person or damage to equipment.

Hazardous voltage: warns about a situation where a hazardous voltage may cause physical in-

jury to a person or damage to equipment.

Information: provides important information about the equipment.

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1.2 Explanations of abbreviations and terms

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1.1 Use of symbols

OMD The control unit of automatic transfer switching equipment, common type name for

the automatic control unit

OMD800 The automatic control unit, high version with communication and display

DPS

Modbus RTU

Dual power source

Bus communication protocol

LN1-Switch I Power supply line, eg. the primary line

LN2-Switch II

Power supply line, eg. the secondary line used in emergency cases

Test sequence

A sequence to test the functionality of the OMD and the connected change-over

switch

Switching delay

Delay on transfer

Dead band I to II delay

TBs

Back switching delay

DBs Dead band II to I delay

Gs Generator stop delay

6AUTOMATIC CONTROL UNIT, OMD800

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2 Product overview

The automatic transfer switch concept is applied to any application requiring switching from the

primary power line to secondary power line to ensure the supply of loads.

The OMD800 has two sensors to monitor two power lines; both sensors are able to work with single

phase or three-phase lines. This unit can be supplied with an external auxiliary power supply. Monitor-

ing, configuration and control are possible via Modbus RTU connection. The OMD800 has a graphic

display where the user is able to check the settings and get all the information about status of the

OMD800.

Analysing the voltage, frequency and the phase balance. Includes the generator START / STOP

command. Communication via Modbus.

DI/DO.

Figure 2.1 Automatic control unit OMD800

1 User interface consists of display, LEDs and keypad

2 Connectors to connect automatic control unit with application and motorized change-over switch

3 Places for fasteners, used when OMD800 is mounted on the door

4 Place for DIN rail

III

OMD

OFFON ON

AUTOMATIC CONTROL UNIT, OMD800 AUTOMATIC CONTROL UNIT, OMD800

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2.1 Typical applications

A. Mains – Generator line

In case of loss of the primary power line, the OMD800 device manages the switching to the emergency

power line equipped with a genset system.

Figure 2.2 Mains - Generator line

B. Mains a – Mains b

In case of loss of the primary power line, the OMD800 device manages the switching to a secondary

power line used as an emergency source.

Figure 2.3 Mains a – Mains b

Automatic control unit type OMD800 is designed for single and three-phase distribution systems in

diverse applications. OMD800 is supplied from Line 1 and Line 2 and can be used without external

power supply.

A07258

III

A07253

III

8AUTOMATIC CONTROL UNIT, OMD800

Figure 2.4 OMD800 have the capability to monitor two three-phase power lines, both able to work

with single phase, too.

OMD800 has an external auxiliary power supply possibility for guarantying an uninterrupted power

supply for the device in the case where the Line 1 and Line 2 are not available.

From the display, user can choose whether the N-line is connected or not.

Figure 2.6 The circuit diagram, when N-line is not connected.

Figure 2.5 An external 24...110 Vdc auxiliary power supply

LINE 1 LINE 2

L1 L2 NL3

2LN1

X11

L1 L2 NL3

X12

LN2

KA00426

LINE 1 LINE 2

NL1

X11

L1 N

X12

KA00425

LINE 1 LINE 2

L1 L2 NL3

2LN1

X11

L1 L2 NL3

X12

LN2

KA00466

2X41

AUX

LINE 1 LINE 2

L1 N

2LN1

X11

L1 N

X12

LN2

KA00467

2X41

AUX

LINE 1 LINE 2

L1 L2 L3

2LN1

X11

L1 L2 L3

X12

LN2

KA00468

2X41

AUX

AUTOMATIC CONTROL UNIT, OMD800 AUTOMATIC CONTROL UNIT, OMD800

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3 Description

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3.1 OMD800 switching sequence

3.1.1 Line 1 priority

The switching sequence of OMD800 can be summarized in following steps:

An anomaly occurs on the Line 1

Switching delay

Generator start

Delay on transfer

If Pre-transfer signal active: Pre-trasnfer signal output on,

Pre-transfer I to II delay

Change-over switch (Switch I) to the position O

Dead band I to II delay

Change-over switch (Switch II) to the position II

If Pre-transfer signal active: Pre-transfer signal output off

And the back switching sequence can be summarized in the following steps:

The Line 1 will start the normal functioning

Back switching delay

If Pre-transfer signal active: Pre-transfer output on,

Pre-transfer II to I delay

Change-over switch (Switch II) to the position O

Dead band II to I delay

Change-over switch (Switch I) to the position I

If Pre-transfer signal active: Pre-transfer output o

Generator stop delay

Generator stop

Figure 3.1 Automatic Switching Sequences in OMD800

Ts: Switching delay, Tt: Delay on transfer, Ds: Dead band I to II, TBs: Back switching delay, DBs: Dead band II to I, Gs: Generator stop delay

Ts TBs Gs

LINE 2

LINE 1

DBs

Switch I status

Gen. START

A04155

Switch II status

Tt Ds

10 AUTOMATIC CONTROL UNIT, OMD800

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3.1.2 No line priority

The switching sequence of OMD800 can be summarized in following steps:

An anomaly occurs on the Line 1

Switching delay

Generator start

Delay on transfer

If Pre-transfer signal active: Pre-transfer signal output on,

Pre-transfer I to II delay

Change-over switch (Switch I) to the position O

Dead band I to II delay

Change-over switch (Switch II) to the position II

If Pre-transfer signal active: Pre-transfer signal output off

And the back switching sequence can be summarized in the following steps:

The Line 1 will start the normal functioning

An anomaly occurs on the Line 2

Switching delay

If Pre-transfer signal active: Pre-transfer output on, Pre-transfer II to I delay

Change-over switch (Switch II) to the position O

Dead band II to I delay

Change-over switch (Switch I) to the position I

If Pre-transfer signal active: Pre-transfer output off

Generator stop delay

Generator stop

Ts: Switching delay, Tt: Delay on transfer, Ds: Dead band I to II, TBs: Back switching delay, DBs: Dead band II to I, Gs: Generator stop delay

Figure 3.2 Automatic Switching Sequence, no line priority

Ts Tt Ds TBs DBs Gs

LINE 1

LINE 2

Switch I status

Switch II status

Gen. start

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