ABB OMD800 User guide

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INSTALLATION AND OPERATING INSTRUCTION
Automatic control unit
OMD800
— Automatic control unit 34OOMS800 rev. E / 1SCC390126M0202

AUTOMATIC CONTROL UNIT, OMD800

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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

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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
Ts Switching delay
Tt Delay on transfer
Ds 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
2
1
4
3

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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
G
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
1
4
3
2LN1
L1
L2
N
L3
X11
L1 L2 NL3
X12
1
4
3
2
LN2
L1
L2
N
L3
KA00426
LINE 1 LINE 2
NL1
1
4
3
2
L1
N
X11
L1 N
X12
1
4
3
2
L1
N
KA00425
LINE 1 LINE 2
L1 L2 NL3
1
4
3
2LN1
L1
L2
N
L3
X11
L1 L2 NL3
X12
1
4
3
2
LN2
L1
L2
N
L3
KA00466
1
2X41
AUX
LINE 1 LINE 2
L1 N
1
4
3
2LN1
L1
L2
N
L3
X11
L1 N
X12
1
4
3
2
LN2
L1
L2
N
L3
KA00467
1
2X41
AUX
LINE 1 LINE 2
L1 L2 L3
1
4
3
2LN1
L1
L2
L3
X11
L1 L2 L3
X12
1
4
3
2
LN2
L1
L2
L3
KA00468
1
2X41
AUX

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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