ABB ATS021 User manual

Automatic transfer switch ATS021
Doc. No. 1SDH000759R0002 - L5785
Installation and operating instructions

Installation and operating instructions, ATS021
3
1SDH000759R0002
Contents
Contents
1. Safety notes ....................................................................................................................... 4
2. Explanation of abbreviations and terms ......................................................................... 5
2.1. General information.......................................................................................................................5
2.2. Times.............................................................................................................................................5
3. Introduction........................................................................................................................ 6
3.1 Product overview...........................................................................................................................6
3.2 Application scenarios ..................................................................................................................7
4. Applications of device ATS021......................................................................................... 8
4.1 Main Line – Emergency Line switching .........................................................................................8
4.2 Main Line – Emergency generator Switching..............................................................................10
4.3 Automatic switching without inverse procedure .........................................................................11
4.4 Line Priority Selection.................................................................................................................11
5. Using the automatic transfer switch ............................................................................. 13
5.1 Interface.......................................................................................................................................13
5.2 LED indicators ............................................................................................................................. 14
5.3 Keypad keys................................................................................................................................ 15
5.4 Rotary selectors ......................................................................................................................... 16
5.4.1 Selector for setting operating mode, voltage limit threshold and operating logic ......................16
5.4.2 Selector for setting delay times Ts and Tbs ................................................................................18
5.5 Dip Switches ...............................................................................................................................19
5.1.1 Setting parameters by means of DIP switches ...........................................................................19
5.6 Using pushbuttons in manual mode ...........................................................................................21
5.7 Test Modes ..................................................................................................................................22
6. Input and output signals ................................................................................................. 23
6.1 Output signals ............................................................................................................................. 23
6.2 Input signals ............................................................................................................................... 24
7. Technical data.................................................................................................................. 26
8. Installation of device ATS021 ......................................................................................... 27
8.1. Door-mounted Automatic Transfer Switch ATS021.....................................................................27
8.2. DIN rail-mounted Automatic Transfer Switch ATS021.................................................................28
9. Regulatory standards...................................................................................................... 29
10. Troubleshooting............................................................................................................... 30

24
Installation and operating instructions, ATS021 1. Safety notes
1. Safety notes
If there are doubts about safe use, the unit must be put out of service.
The automatic transfer switch ATS021 must be prevented from operating the circuit breakers before:
• accessing the circuit breakers
• performing maintenance on circuit breakers or any electrical circuits powered by them
• performing any operation where opening/closing the circuit breaker could be dangerous
During maintenance:
• set the "Manual" mode.
• lock the circuit breaker mechanically in the open position.
Safe use is not guaranteed if:
• the device has been damaged during transport
• the device shows visible signs of damage
• the device does not work
• the device has been stored for a long period
If the device operates on a circuit without warning, it must be excluded from the control circuit even if it
seems to be in stand-by
Before using the ATS021 unit, read the following “Safety notes”:
using the unit without following the indications can lead to malfunctioning and, in
some cases, hazardous conditions.

Installation and operating instructions, ATS021
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1SDH000759R0002
2. Explanation of abbreviations and terms
2. Explanation of abbreviations and terms
2.1. General information
ATS: Automatic Transfer Switch; automatic switching device
ATS021: ATS of the ATS02x series, version with rotary switch and LEDs.
CB: Circuit Breaker; low voltage automatic Circuit Breaker.
CB1: CB on line LN1.
CB2: CB on line LN2.
LN1: Power supply line No.1.
LN2: Power supply line No.2.
Lim: Rotary switch of automatic/manual mode and voltage limit thresholds
Ts: Rotary switch for setting Ts (See Chap. 2.2 – Times)
fn: Rated plant frequency
2.2. Times
NOTE: All the details of the times and switching logics are described in the Chapters concerned.
TS: - Opening delay of main line CB, after detection of fault in the mains (generator is not in
use)
- Generator start delay, after detection of fault in mains (generator in use).
TBS: Opening delay of emergency line CB, after detection of stabilised voltage on main line
TGOFF: Generator switching off delay, after closure of normal line CB.
TF: fixed delay of emergency line CB closure, after detection of stabilised voltage on the same
line and fixed delay of normal line CB closure, after opening of emergency line CB.

26
Installation and operating instructions, ATS021 3. Introduction
3. Introduction
3.1 Product overview
The automatic transfer switch ATS021 is used in all installations where switching is required between two
lines to ensure the supply of loads in case of a fault on one line.
ATS021 selects the power supply line by acting directly on the CBs provided on the lines: ATS021 can be
used with automatic CBs and ABB SACE switch-disconnectors.
The device monitors the voltage of the main line and emergency line and records the following faults:
• Maximum and minimum voltage (up to +/-30%)*
• Maximum and minimum frequency (0.9fn>f>1.1fn)
• Phase balance
• Frequency imbalance**
• Voltage imbalance***
* Max. +20% in case of 480 VAC voltage and min. -20% in case of 208 VAC voltage
** In case of frequency imbalance, the fixed threshold +/- 10% is also applied to the difference between
the two frequency values of the phases.
***In case of imbalance of voltage, the threshold set by means of the Lim selector is also applied to the
difference between the voltage values of the phases.
Depending on the settings and the anomalies recorded, the device pilots the CBs on the power supply
lines to ensure continuous power supply of the plant.
ATS021 does not require an auxiliary safety power supply since it is powered directly by the line voltages.
ATS021 can be used in manual or automatic mode. In the first case, the circuit breakers can be
controlled by means of pushbuttons present on the front of the device, while in automatic mode, the
switching logic is controlled directly by the device.
The settings and adjustments can be done by means of dip switches and rotary selectors; the statuses
of the lines, the circuit breakers connected and the device itself are visible by means of special LEDs, if
the unit is powered.
ATS021 can be used in systems with rated frequency 50Hz, 60Hz which can be set by means of dip
switch.
The device can be used in single-phase, three-phase systems with Neutral and three-phase without
neutral, the setting can be done by means of dip switch.
If the ATS021 is used in systems without the Neutral, an external voltage transformer must be used
If the ATS021 is used in single-phase systems the Neutral wire must be connected.

Installation and operating instructions, ATS021
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1SDH000759R0002
KA00462IT
1
4
3
2LN1
L1
L2
L3
X11
L1 L2 L3
N
L
2
1X13
LN1
1
4
3
2LN2
L1
L2
L3
X12
L1 L2 L3
N
L
2
1X14
LN2
1
4
3
2LN1
L1
X11
N
L
2
1X13
1
4
3
2LN2
L1
X12
N
L
2
1X14
N
N
LN1
L1 N
LN2
L1 N
N
NN
N
KA00465IT
LN1
L1
L2
L3
L1 L2 L3
N
L
LN1
LN2
L1
L2
L3
L1 L2 L3
N
L
LN2
1
4
3
2X12
2
1X14
1
4
3
2X11
2
1X13
1
4
3
2LN1
L1
X11
N
L
2
1X13
1
4
3
2LN2
L1
X12
N
L
2
1X14
LN1
L1 N
LN2
L1 N
N
N
Figure 3.1: Diagram showing ATS021 connection to lines LN1-LN2
3.2 Application scenarios
The ATS021 device may be used in the following applications:
• Main line – Emergency line switching
• Main line – Emergency generator switching
With the Lim rotary switch in the SETUP position, the RESET key can be used to set the following
switching logics:
• main line: Line LN1
• no line priority
• automatic mode without inverse procedure
Different combinations of LEDs indicate the setting of the various switching logics. For the details, see
Chap. 5.
3. Introduction

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Installation and operating instructions, ATS021
4. Applications of device ATS021
The ATS021 device controls all the switching sequences by applying the
time delays that can be set:
Time delays Description Value
TS Delay
Opening delay of main line CB1 after detection of a fault in
the mains (Generator is not in use) 0…30s
Generator start delay after detection of a fault in the mains
(Generator in use).
TBS Delay Opening delay of emergency line CB2 after detection of
power restored on main line.
0…30s
or Fixed 300s
TF Delay
Closing delay of emergency line CB2 after detection of
voltage on emergency line Fixed 3.5 sec
Closing delay of emergency line CB1 after detection of
voltage on main line
TGOFF Delay Generator switching off delay after closure of main line
CB1.
0…30s
or Fixed 300s
Table 4.1 Description of time delays
4.1 Main Line – Emergency Line switching
Description
Both the lines are normally present; in case of a fault in the main line, ATS021 switches on the emergency
line used as the reserve line.
KA00428
Figure 4.1: Application diagram – generator not in use
4. Applications of device ATS021

Installation and operating instructions, ATS021
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1SDH000759R0002
4. Applications of device ATS021
Time diagrams
Figure 4.2: Application time diagram - line-line (main line LN1)
TS TF TBS TF
Line 1 ok
CB1 CLOSED
Line 2 ok
CB2 CLOSED

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Installation and operating instructions, ATS021
4.2 Main Line – Emergency generator Switching
Description
In case of a mains failure the ATS021 automatically starts up an emergency generator
and, as soon as power is available on the generator side, ATS021 starts the
automatic switching procedure.
G
KA00427
Figure 4.3: Application diagram – generator in use
Time diagrams
TS TF TBS TF TGOFF
Line 1 ok
CB1 CLOSED
Line 2 ok
CB2 CLOSED
GEN START
Figure 4.4: Line-generator application time diagram (main line LN1)
4. Applications of device ATS021

Installation and operating instructions, ATS021
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1SDH000759R0002
4. Applications of device ATS021
4.3 Automatic switching without inverse procedure
Description
Following an anomaly of the main line, ATS021 switches to an emergency line (1). If the mains supply is
restored, the inverse switching procedure is not started up (2).
If there is a fault in the reserve line, ATS021 must open the emergency switch (3) and wait for the
emergency line to return to reclose (4), without in any case providing for switching on the main line.
This operating mode is also applicable if the generator is present: in this case, after time Ts the generator
is started up and as soon as the emergency line is available CB1 is opened.
ATTENTION If ATS021 is not powered by any of the two lines the device waits for at least one of the two
lines (5) to return before proceeding with the switching procedure (6).
Time diagrams
(1) (2) (3) (4) (5) (6)
TS TF TFTBS TBS
Line 1 ok
CB1 CLOSED
Line 2 ok
CB2 CLOSED
Figure 4.5: Line-line application time diagram without inverse switching procedure
4.4 Line Priority Selection
Description
ATS021 makes it possible to handle the priority of the lines; the following selections are possible:
• main line: Line LN1
• no line priority: ATS021 ensure power to the load from one of the lines considering anyone of them as
priority line. So, for example, after the switch to LN2 because of LN1 falls, ATS021 stay on LN2 even
if LN1 came back. It is possible to select this mode by means of the RESET key with the Lim rotary
switch in the SETUP position. For more the details, see Chap. 5.

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Installation and operating instructions, ATS021
Time diagrams
TS TF TBS TF
Line 1 ok
CB1 CLOSED
Line 2 ok
CB2 CLOSED
Figure 4.6: Time Diagram no line priority – generator non in use
Line 1 ok
CB1 CLOSED
Line 2 ok
Gen start
CB2 CLOSED
TS TF
Figure 4.7: Time diagram no line priority – generator in use
4. Applications of device ATS021

Installation and operating instructions, ATS021
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1SDH000759R0002
5. Using the automatic transfer switch
5.1 Interface
RESET
ATS021
M3010004A
MAN.
+
-%
10 15
20
30
10
20
30
SETUP
AUTO
0s
0s 10
10
20
30
20
30
Tbs=Ts
Ts Lim
Tbs=300s
14
4
6
3
5
2
81
7
11
12
10
13
9
Figure 5.1: Description of ATS021 front panel interface
Ref. Description
1 CB1: pushbutton for opening/closing circuit breaker CB1
2 CB2: pushbutton for opening/closing circuit breaker CB2
3 RESET: alarms reset button
4 TEST: test mode selection pushbutton
5 LED LN1: line 1 status indicator
6 LED LN2: line 2 status indicator
7 LED CB1: CB1 circuit breaker status indicator
8 LED CB2: CB2 circuit breaker status indicator
9 LED POWER: indicates power supply presence
10 LED AUTO: indicates automatic or manual mode
11 LED ALARM: indicates active alarm
12 Ts: Switching delay times rotary switch
13 Lim: Automatic/manual mode rotary switch and voltage limit thresholds
14 Serial No.
Table 5.1: Description of ATS021 interface
5. Using the automatic transfer switch

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Installation and operating instructions, ATS021
5.2 LED indicators
Alarm
The steady red Alarm LED, see Figure 5.1/11, may indicate one of the following events:
• generic alarm
• logic disabling from input DI3
The alarm LED switches Off indicating that the switching logic is enabled and no alarms are present
Auto
The Auto LED, see Figure 5.1/10, indicates the operating mode:
• manual: LED Off
• automatic: steady green LED
• test: flashing green LED
Power
The Power LED, see Figure 5.1/9, indicates the presence of power supply:
• power supply present: steady green LED indicates power supply from line voltage
• no power supply: LED Off indicates that both lines are not present and that the Powersave condition
has ended. The switching logic is in stand-by for return of one of the line voltages
• Powersave: green flashing LED indicates, if both lines are absent, that the device is active and is in
stand-by for return of one of the line voltages (maximum duration 1 minute). When the Powersave
period ends, the LED switches off and the device awaits a line voltage. The moment the normal or
the emergency line is restored, with ATS021 in automatic, the unit analyses the conditions of the
lines monitored and the status of the circuit breakers and proceeds with the switching operation
in accordance with the situation concerned. If power is absent in both lines, the alarms signalling
contact is activated.
LN1 – LN2
The status of lines LN1 and LN2 is signalled by means of the red LEDs LN1 and LN2, see Figure 5.1/5 –
5.1/6; the status of the lines is expressed in the Table shown below.
Line status LED indication
Power OK ON
No power OFF
Maximum voltage Rapid flashing (5 Hz)
Minimum voltage Flashing (1 Hz, 50% ON / 50% OFF)
Frequency not valid Flashing (1 Hz, 90% ON / 10% OFF)
Imbalance Flashing (1 Hz, 10% ON / 90% OFF)
Table 5.2: Indications of status of lines LN1 - LN2
5. Using the automatic transfer switch

Installation and operating instructions, ATS021
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1SDH000759R0002
5. Using the automatic transfer switch
CB1
The status of circuit breaker CB1 is signalled by red LED CB1, see Figure 5.1/7:
Circuit Breaker Status CB1 LED Indication
CB1 open LED CB1 OFF
CB1 closed LED CB1 ON
CB1 opening movement under way CB1 LED flashing (1 Hz, 50%ON / 50%OFF)
CB1 closing movement under way CB1 LED flashing (1 Hz, 50%ON / 50%OFF)
CB1 opening failed LED CB1 ON - LED Alarm ON
CB1 closure failed CB1 LED flashing - Alarm LED flashing
Table 5.3: CB1 status indications
CB2
The status of circuit breaker CB2 is signalled by red LED CB2, see Figure 5.1/8:
CB2 circuit breaker status LED indication
CB2 open LED CB2 OFF
CB2 closed LED CB2 ON
CB2 opening movement under way CB2 LED flashing (1 Hz, 50%ON / 50%OFF)
CB2 closing movement under way CB2 LED flashing (1 Hz, 50%ON / 50%OFF)
CB2 opening failed LED CB2 ON - LED Alarm ON
CB2 closing failed CB2 LED flashing - Alarm LED flashing
Table 5.4: CB2 status indications
5.3 Keypad keys
CB1 key
In manual mode, press the CB1 key, see Figure 5.1/1 for Opening/Closure of circuit breaker CB1.
CB2 key
In manual mode, press the CB2 key, see Figure 5.1/2 for Opening/Closure of circuit breaker CB2.
RESET
In case of alarm, press RESET to reset the alarm.
TEST button
ATS021 must be in the manual position.
Press the TEST key, see Figure 5.1/4, to set the test mode of the direct and inverse switching sequences.
To exit the TEST mode press RESET.

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Installation and operating instructions, ATS021
5.4 Rotary selectors
5.4.1 Selector for setting operating mode, voltage limit threshold and
operating logic
ATS021 can be set in manual or automatic mode by moving the Lim rotary switch, see Figure 5.1/13 on
the front panel in the MAN or AUTO section.
The voltage limit threshold is selected by turning the Lim rotary switch to the
position corresponding to the required value.
The following options are available:
• in manual mode: ± 10, ± 20, ± 30 %.
• in automatic mode: ± 10, ± 15, ± 20, ± 30 %.
• Operating logic configuration (SETUP).
The operating logic can be configured by turning the Lim rotary switch to the SETUP position and
following the procedure described in the “Switching logic Setup” Chapter.
MAN.
+
-%
10 15
20
30
10
20
30
SETUP
AUTO
Lim
Figure 5.2: Description of Lim rotary selector
Manual mode
ATS021 can be set in manual mode by turning the Lim rotary switch, see Figure 5.1/13 on the front panel
in the MAN section.
For example, when the Lim rotary switch is in the MAN area in position 20, ATS021 operates in Manual
mode and the voltage threshold is ±20 %; in manual mode this threshold is used as the reference for the
LN1 and LN2 LED signals.
Automatic mode
ATS021 can be set in automatic mode by turning the Lim rotary switch, see Figure 5.1/13 on the front
panel in the AUT section.
For example, when the Lim rotary switch is in the AUTO area in position 20, ATS021 operates in
Automatic mode and the voltage threshold is ±20%; in automatic mode this threshold is used as the
reference for the switching procedure start-up and for the LN1 and LN2 LED signals.
Switching logic setup
ATS021 allows the setting of three different operating logics:
• main line: Line LN1
• no line priority
• automatic switching without inverse procedure
5. Using the automatic transfer switch

Installation and operating instructions, ATS021
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1SDH000759R0002
5. Using the automatic transfer switch
To select the different operating logics:
1. turn the Lim rotary switch to the SETUP position
2. press the RESET button to select the switching logic used by ATS021.
3. the selection of a definite operating logic is indicated by a different lighting up of the LEDs according
to the table shown below:
OPERATING LOGIC LEDs INDICATION
Main line 1 LED POWER ON
No line priority LED POWER ON
LED CB1 ON
Automatic switching
without inverse procedure
LED POWER ON
LED CB1 ON
LED CB2 ON
Table 5.5: Description of ATS021 operating logic setup
WARNING: after the operating logic setup, the user must make sure the device is not left accidentally in
the SETUP position.

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Installation and operating instructions, ATS021
5.4.2 Selector for setting delay times Ts and Tbs
The delay times can be set by means of rotary switch Ts, see Figure 5.1/12 on the front panel.
The time settings possible are:
Time delays Description Value
TS Delay
Opening delay of main line CB1 after detection of a fault in
the mains (Generator is not in use)
0…30s
Generator start delay after detection of a fault in the mains
(Generator in use).
TBS Delay Opening delay of emergency line CB2 after detection of
power restored on main line.
0…30s or Fixed
300s
Table 5.6: Description of ATS021 delay time
Two different sections are available:
• section Tbs=Ts: select time Ts by turning the rotary switch to one of the possible positions. ATS021
uses a time Tbs equal to time Ts selected.
The possible selections are 0s, 10s, 20s, 30s.
• section Tbs=300s: select time Ts by turning the rotary switch to one of the possible positions. ATS021
uses a fixed time Tbs of 300sec.
The possible selections for Ts are 0s, 10s, 20s, 30s.
0s
0s 10
10
20
30
20
30
Tbs=Ts
Ts Tbs=300s
Figure 5.3: Description of Ts rotary selector
5. Using the automatic transfer switch

Installation and operating instructions, ATS021
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1SDH000759R0002
5. Using the automatic transfer switch
5.5 Dip Switches
Figure 5.4: ATS021 lower interface
The parameters which can be modified by means of the dip switches in the lower part of the ATS021 are:
Un Rated voltage: can be set by means of DIP switches S23-1...3
fn Rated frequency: can be set by means of DIP switch S23-4
NNeutral in use, can be set by means of DIP switch S24-1
Ph Number of phases: can be set by means of DIP switch S24-2
Gen Generator in use: can be set by means of DIP switch S24-3
Tgoff Delay in switching off generator: can be set by means of DIP switch S24-4
5.1.1 Setting parameters by means of DIP switches
S23 S24
Figure 5.5 Default setting DIP switches ATS021
DIP switches S23
DIP switches S23-1...3 for setting rated voltage of lines monitored
S23-1...3 Positions UN - main/phase voltage
OFF, OFF, OFF Un - 480/227 V OFF, OFF, ON Un - 380/220 V
ON, OFF, OFF Un - 440/254 V ON, OFF, ON Un - 230/130 V
OFF, ON, OFF Un - 415/240 V OFF, ON, ON Un - 220/127 V
ON, ON OFF Un - 400/230 V
(default)
ON, ON, ON Un - 208/120 V

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Installation and operating instructions, ATS021
DIP switch S23-4...3 for setting rated frequency of lines monitored
S23-4 Positions Rated frequency fn
OFF 50Hz (default)
ON 60Hz
Figure 5.6: Description of settings DIP Switches S23 - ATS021
DIP switches S24
DIP switch S24-1 for setting neutral
S24-1 Positions Neutral
OFF N used (default)
ON N not in use
DIP switch S24-2 for setting the phase system
S24-2 Positions Phase System
OFF three-phase (default)
ON single-phase
DIP switch S24-3 for setting the unit in use
S24-3 Positions Generator
OFF not in use (default)
ON in use
5. Using the automatic transfer switch