Mebay ATS 420 Series User manual

ATS 420 ATS CONTROLLER
USER MANUAL

ATS 420 ATS CONTROLLER USER MANUAL
2
Software Version
No.
Version
Date
Note
1
V1.0
2021-07-01
Original release.
Chongqing Mebay Technology Co.,Ltd
Add: No6-2,Building 4, Gangan Rd, Jiangbei District, Chongqing.
Tel：[phone]
Fax：[phone]
Web：http://www.mebay.cn
http://www.cqmb.cn
E_mail：[email protected]

ATS 420 ATS CONTROLLER USER MANUAL
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Symbol Description
Symbol
Description
Note
Remind operators to operate correctly, otherwise it may cause
the equipment not to work correctly.
Be care
It is indicated that potential hazards can damage equipment
without proper precautions.
Warning
It is indicated if appropriate preventive measures are not taken,
potentially dangerous situations may result in death, serious
personal injury or significant property losses.

ATS 420 ATS CONTROLLER USER MANUAL
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Warning
1.The installation of this equipment must be carried out by professionals.
2.When installing and operating the controller, please read the entire instruction
manual first.
3.Any maintenance and commissioning of the equipment must be familiar with all the
equipment.
4.Safety standards and precautions in advance, otherwise it may cause personal
injury or damage to related equipment.
5.After the installation of the controller is completed, please verify that all protection
functions are valid.
Be Care
1.Please keep the good connection of the power supply of the controller. Do not
share the connection lines of the positive and negative electrodes of the battery
with the floating charger.
2.During the operation of the engine, do not disconnect the battery, otherwise it may
cause damage to the controller.

ATS 420 ATS CONTROLLER USER MANUAL
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Catalogue
Summary................................................................................................................................... 6
Main Features........................................................................................................................... 6
Parameters Display..................................................................................................................7
Parameters................................................................................................................................7
Overall Dimension and Wiring Diagram............................................................................... 8
Installation instruction............................................................................................................14
Panel and display...................................................................................................................15
Generator set start/stop operation...................................................................................... 16
Switch operation and ATS power control...........................................................................19
Prompt status information.....................................................................................................21
Parameter setting...................................................................................................................22
Fault finding............................................................................................................................ 29
Notes:
1. All rights reserved. No part of this duplication may be reproduced in any material
form (including photocopying or storing in any medium by electronic means or others)
without the written permission of the copyright holder.
2. MEBAY Technology reserves the rights to change the contents of this document
without prior notice.

ATS 420 ATS CONTROLLER USER MANUAL
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Summary
The controller is a dual power switching ATS controller, dual power intelligent
switch module with programmable, automatic measurement, automatic control and
LCD display functions. Automatic measurement and control can reduce incorrect
operation. It is an ideal option for ATS.
2.8inch LCD screen display with brand new UI design is adapted in this
controller can display related parameters directly. The LCD screen can display
various faults at the same time. Once the generator does not run normally, it can
effectively achieve protection.
There are Chinese/English interface options, more language can be set
according to user’s request. All the parameters can be configured through the front
face buttons or use programmable interface by RS485 or USB to adjust via PC. It has
compact structure, advanced circuits, simple wiring and high reliability, It can be
widely used in various types of power systems.
Main Features
There are two Models under ATS 420 series.
ATS 420: Dual power intelligent switch module.
ATS 420 R: Based on ATS 420, it adds RS485 port.
Dual core 32bit high performance single chip microcomputer.
2.8inch LCD screen, Available in Chinese/English languages, user’s language set
if necessary.
System type can set as: "S1 Mains S2 Mains", "S1 Mains, S2 Gen", "S1 Gen S2
Mains", "S1 GenS2 Gen".
Acrylic material is adapted to protect the screen.
PC material panel, waterproof, oil-proof, UV-resistant, good operation feel and
long service life.
USB Port: parameters can be set even without power through USD port to monitor
in real time.
With RS485 communication port, can achieve "Three Remote" functions via
MODBUS protocol.
Collection and display, gen, mains, power, phase and other parameters.
Applicable for PC Three-stage, PC Two-stage, CB and CC switch.
Automatic/Manual mode. In manual mode, can force the switch to close or open.
Can control two generators to work as Cycle Run mode, Master Run mode and
Balance Run mode.
Suitable for various AC systems (3 phase 4-wires, 3-phase 3-wires, single-phase
2-wire, and 2-phase 3-wire).
Input/output function, status can be shown directly.
Real time clock inside.
Totally 5 relays output, 3 relays function configurable.
Totally 4 configurable switch input, 2 switch function configurable.
Control Protection: Realize automatic ATS switching of generator sets, perfect
fault display and protection functions.

ATS 420 ATS CONTROLLER USER MANUAL
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Standard water-proof rubber gasket. The waterproof can reach IP54.
Module design: All the connections are adapted with European connectors so that
installation, connection, repair and replacement can be more easily.
Parameters Display
S1/S2 Voltage status
S1/S2 Frequency
Current real-time status
S1/S2 Switch status
S1/S2 Phase voltage
S1/S2 Work status
Input/Output status
Total Power-on time
Alarm number and account
Alarm type (Warn Alarm, Fault Alarm)
Alarm event
Inputs, outputs number
Input status, S1/S2 closing input, 1~2 are configurable ports
Output status, S1/S2 closing output, 1~3 are configurable ports
Real-time clock
Current date/time
Parameters
Options
Parameters
Working voltage
DC 8V----36V Continuous
Power consumption
Standby：24V：MAX 2W
Working：24V：MAX 3W
S1 AC Voltage Input
1P2W 30VAC-360VAC (ph-N)
2P3W 30VAC-360VAC (ph-N)
3P3W 60VAC-620VAC (L-L)
3P4W 30VAC-360VAC (ph-N)
S2 AC Voltage Input
1P2W 30VAC-360VAC (ph-N)
2P3W 30VAC-360VAC (ph-N)
3P3W 60VAC-620VAC (L-L)
3P4W 30VAC-360VAC (ph-N)
MAX Accumulating Time
99999.9Hours (Min Store time:6min)
Closing S1 output
250V/10 AMP Non-contact normally Open output

ATS 420 ATS CONTROLLER USER MANUAL
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Closing S2 output
250V/10 AMP Non-contact normally Open output
AUX. OUTPUT 1
250V/5 AMP Non-contact normally Open output
AUX. OUTPUT 2\3
250V/10 AMP Non-contact normally Open output
Closing S1 input
Available if connecting with Battery -
Closing S2 input
Available if connecting with Battery -
AUX.INPUT 1\2
Available if connecting with Battery -
Working condition
-25-70℃
Storage condition
-40-80℃
Protection Level
IP54：when waterproof rubber gasket is added between
controller and its panel
Insulation strength
Apply AC 2.2kV voltage between high voltage terminal and
low voltage terminal; The leakage current is not more than
3mA within 1min.
Overall dimension
142mm*105mm*45mm
Panel cutout
116*90mm
Weight
0.5Kg
Overall Dimension and Wiring Diagram
Overall Dimension:

ATS 420 ATS CONTROLLER USER MANUAL
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Descriptions of terminal connection

ATS 420 ATS CONTROLLER USER MANUAL
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No.
Function
Description
Cable cross
sectional area
1
S1 Close Output
Non-contact normally Open output
Capacity: 250V/10A
1.5mm2
2
1.5mm2
3
S2 Close Output
Non-contact normally Open output
Capacity: 250V/10A
1.5mm2
4
1.5mm2
5
Aux.
Output 1
Normally Close
250V/5 AMP Relay contact Output
1.5mm2
6
COM
1.5mm2
7
Normally Open
1.5mm2
8
A1
S1 AC System 3P4W voltage input
For single phase, only connect A1, N1
1.5mm2
9
B1
1.5mm2
10
C1
1.5mm2
11
N1
1.5mm2
12
A2
S2 AC System 3P4W voltage input
For single phase, only connect A2, N2
1.5mm2
13
B2
1.5mm2
14
C2
1.5mm2
15
N2
1.5mm2
16
B-
Connected with negative of starter battery.
1.5mm2
17
B+
Connected with positive of starter battery.
1.5mm2
18
S1 Close Output
Detect the S1 ATS closing status,
Ground connected is active.
1.5mm2
19
S2 Close Output
Detect the S2 ATS closing status,
Ground connected is active.
1.5mm2
20
Aux. Input 1
User-defined.
Ground connected is active.
1.5mm2
21
Aux. Input 2
1.5mm2
22
RS485_B-
RS485 Communication Port
A 120 Ω shielded wire and good grounding
are recommended
1.0mm2
23
RS485_A+
1.0mm2
24
RS485_SCR
1.0mm2
25
Aux.
Output 2
Normally Close
Default: ATS Power L
250V/5AMP Relay contact Output
1.5mm2
26
COM
1.5mm2
27
Normally Open
1.5mm2
28
Aux.
Output 3
Normally Close
Default: ATS Power N
250V/5AMP Relay contact Output
1.5mm2
29
COM
1.5mm2
30
Normally Open
1.5mm2
USB-B
For PC operation and control

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ATS 420 Typical Wiring Diagram
The following is a full-function application diagram of the ATS controller series.
The AUX. OUTPUT1 is set as the gens start output (normally open) of the default.
MBS1 Wiring Diagram
Parameters Setting
1
Switch Type
PC Three-stage
2
Aux. Output 1
Gen Start Output
3
Aux. Output 2
ATS Power L
4
Aux. Output 3
ATS Power N
911 810 18 19 16 13 1512 14
TO LOAD SWITCHING DEVICE
L1 L2 L3 N
303 305 302
BATTERY
16 17
(DC8-36V)
-+
20 21 22 23 24
SCR
A
B
AUX. INPUT 1 AUX. INPUT 2
RS485
Remote
Start
A1B1 C1N1
S1 AC VOLTAGE INPUT
(AC0-300V)
R1
S1
T1
N1
R2
S2
T2
N2
S1 POWER INPUT S2 POWER INPUT
S1 CLOSE INPUT S2 CLOSE INPUT
MODE：ATS420
MBS1
USB
12 3 4
A2B2 C2N2
S2 AC VOLTAGE INPUT
(AC0-300V)
GND
76
B+B-
Generator
MAX 5A
20A 10A 10A 20A 10A 10A
5
25 28 27 30
S1 CLOSE S2 CLOSE
OUTPUT
(10A)
OUTPUT
(10A)
FIRE SWITCH
202 203 204 205

ATS 420 ATS CONTROLLER USER MANUAL
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Contactor Wiring Diagram
Parameters Setting
1
Switch Type
CB/CC
2
Aux. Output 1
Gen Start Output
3
Continuously Close
1-Enable
13 1512 14
TO LOAD SWITCHING DEVICE
L1 L2 L3 N
R1
S1
T1
N1
R2
S2
T2
N2
S1 POWER INPUT S2 POWER INPUT
MODE：ATS420 USB
8
A2 B2 C2 N2
S2 AC VOLTAGE
INPUT(AC0-300V)
1
910 11 16
GND
218 19
S1 CLOSE INPUT S2 CLOSE INPUT
316
GND
4
A1 B1 C1 N1
S1 AC VOLTAGE
INPUT(AC0-300V)
Contactor Contactor
20A 10A 10A 20A 10A 10A
BATTERY
16 17
(DC8-36V)
-+
20 21 22 23 24
SCR
A
B
AUX. INPUT 1 AUX. INPUT 2
RS485
Remote
Start
76
B+B-
Generator
MAX 5A
525 26
MAX 10A
27 28 29
MAX 10A
30
AUX. OUTPUT 2 AUX. OUTPUT 3
S1 CLOSE S2 CLOSE
OUTPUT (10A) OUTPUT (10A)

ATS 420 ATS CONTROLLER USER MANUAL
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Breaker Wiring Diagram
Parameters Setting
1
Switch Type
CB/CC
2
Aux. Output 2
S1 Open Control
3
Aux. Output 3
S2 Open Control
4
Aux. Output 1
Gen Start Output
5
MCH:Stored Energy Motor; MN:Under Voltage Trip;
MX:Open Relay;XF:Close Relay;
13 1512 14
TO LOAD SWITCHING DEVICE
L1 L2 L3 N
R1
S1
T1
N1
R2
S2
T2
N2
S1 POWER INPUT S2 POWER INPUT
8
A2 B2 C2 N2
1
910 11 2 27 29 3 4
A1 B1 C1 N1
Breaker Breaker
MCH
MN
MX
XF
MCH
MN
MX
XF
26 16
GND
30
18 19
20A 10A 10A 20A 10A 10A
MODE：ATS420 USB
BATTERY
16 17
(DC8-36V)
-+
20 21 22 23 24
SCR
A
B
AUX. INPUT 1 AUX. INPUT 2
RS485
Remote
Start
76
B+B-
Generator
MAX 5A
5
S1 CLOSE S2 CLOSE
INPUT INPUT
S1 AC VOLTAGE
INPUT(AC0-300V)
S2 AC VOLTAGE
INPUT (AC0-300V)
S1 CLOSE S1 OPEN
OUTPUT
(10A)
OUTPUT
S2 OPEN
OUTPUT
S2 CLOSE
OUTPUT
(10A)

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Installation instruction
The controller is fixed by two special fixing members and screws, and the screws
of the metal fasteners cannot be too tight.
Panel Cutout: W116mm*H90mm.
Note: If the controller is installed directly in the genset shell or other fluctuated
equipment, the rubber pad must be installed.
Battery Voltage Input
ATS 420 controller is suitable for 8-36V DC battery voltage. Battery negative must be
reliably connected to the enclosure of the engine. The controller power supply B+
and B- must be connected to battery positive and negative, and the wire size must
not be less than 1.5mm2.
NOTE:
In case of floating charger connect charger output to battery positive and negative
directly, then, connect battery positive and negative poles to controller positive and
negative power supply.
Output and relay expansion
Note: All outputs of the controller are relay contacts. The maximum current
capacity is described in the "Parameters" in this manual. Please use it in the relay
current capacity. If an extended relay is needed, add a continuous current diode
(when the extended relay coil is DC) or a resistance-capacitance loop (when the
extended relay coil is AC) to both ends of the coil to prevent interference with the
controller or other equipment.

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If withstanding voltage test is conducted after the controller has already been
installed onto the control panel, please unplug all controller terminal connections in
order to prevent high voltage from damaging it.
Panel and display
Key Function Description
KEYS
NAME
Main Function
Open
Under running status. Press this key to stop the
generator set and operate all partial brakes;
Pressing this key can cancel the setting and back to
upper class under edition.
Under the setting mode with checking data, the data can
be saved and system will exit after pressing.
Manual
Test
Pressing this key will set the module into manual mode.
Press this key for 3 seconds to enter into genset manual
start/stop operation interface.
Auto
Pressing this key will set the module into auto mode.
S1 Close/Open
Active in Manual mode. Press this key, if S1 load is
opened, then the S1 closing relay will be energized; if S1
load is closed, then the S1 opening relay will be energized.
S2 Close/Open
Active in Manual mode. Press this key, if S2 load is
opened, then the S2 closing relay will be energized; if S1
load is closed, then the S2 opening relay will be energized.
Up
Under display mode, parts of the page can move up.
Under edition mode, pressing this key to move the digit
or increase the numbers.
Open
Auto
Manual/Test
LCD
OK/Setting
Down
S2 Close/Open
UP
S1 Close/Open
Running
Warning
Alarm

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Under records mode, pressing this key to move the digit.
Down
Under display mode, parts of the page can move down.
Under edition mode, pressing this key to move the digit
or decrease the numbers.
Under records mode, pressing this key to move the digit.
OK
SET
Eliminate alarm
Confirm the change under edition mode.
Shift right under edition mode.
Page exited under records checking mode.
In standby state, press for 3 seconds to enter the
parameter setting mode.
In the alarm page, press this key to eliminate the fault
alarm.
LED Indicators description
Indicator Type
Description
Alarm
Lights red when a fault alarm occurs.
Warning
Lights yellow when a warning alert occurs.
Running
Green during normal operation.
S1 Close Status
It is light on when S1 close input is activated.
S2 Close Status
It is light on when S2 close input is activated.
Manual/Test Mode
It is light on when the module is in Manual mode.
It is light on when the module is in Test mode.
Auto Mode
It is light on when the module is in Auto mode.
Alarm records checking
ATS 420 controller can save 14 group of alarm records which contains the alarm
record data includes detailed data such as alarm time,prompt status information, etc.
How to check the alarm records:
1. Enter alarm record page:
1) Press the key for 3 seconds to view the alarm record.
2) Enter the setting mode, select the alarm record and press key to enter
2. Press to turn upper digit and press to turn lower digit in order to choose
the record you need. Press to confirm the record and come into history records
checking page.
3. Press to turn lower records under records checking page. Press to turn
upper records and press to revert back to alarm history records page.
4. Exit from records page: In the history records page and checking page, press
to exit.
Generator set start/stop operation
Test machine
In the main screen, Press the for 3 seconds to enter into manual start operation
interface.

ATS 420 ATS CONTROLLER USER MANUAL
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Press / key to choose parameters (the current line was highlighted with black)
and then press Confirm key to confirm.
1. Return
Notes and function description
2. Stop to test
When test machine has been chosen, and if this item is selected,
genset start signal will disconnect immediately and it will stop
TEST OFF-LOAD or TEST ON-LOAD operation.
3. Test on load
It will send out a start generator signal immediately. After gen
voltage is normal, the ATS will transfer the load to mains
immediately regardless the mains is normal or not.
4. Test off load
It will send out a start signal immediately. After gen voltage is
normal, if mains voltage is normal, the ATS will not act. If mains
voltage is abnormal, ATS will transfer the load to generator.
When mains volt recovers to normal, the ATS will transfer the
load to mains. At this time the start generator signal still
continuously outputs.
5. Cycle
Run Start
When this is chosen, oil engine start signal will output circularly
according to master status. Circular output time can be set by the
users. If oil engine fault occurs, it won't send start signal to the oil
engine. If it transfers to manual mode, it will keep current status
and stop circular start time counting.
Requirements needed:
1. In automatic mode.
2. Set output to S1/ S2 start normally open output
3. Set input to remote start input.
4. <Cycle running time> and <Cycle stop time> should be programmed.
5. Set the system type as S1 Gens & S2 Gens.
6. Set proper < Wait Running > time, and set default delay to 60s.
In manual mode,after choosing a test machine , generator start-signal will output
immediately, but the ATS will not transfer automatically except for operation manually
by pressing key on the front panel.
Manual start
Press and manual mode indicator is on, which means controller is in manual
mode.
Press , S1 close relay outputs immediately, if S1 close input is active, the S1
power supply connects to load.
Press , S2 close relay outputs immediately, if S2 close input is active, the S2
power supply connects to load.
Press , S1/S2 open relay outputs immediately, if S1/S2 close input is inactive, the
S1/S2 power supply disconnects with load.

ATS 420 ATS CONTROLLER USER MANUAL
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NOTE: For the ATS without neutral position, it is invalid to press key.
Remote start/stop
Send remote start/stop signals using MODBUS protocol via RS485 port.
Remote Stop：Disconnect the start signal, i.e. stop the running genset.
Remote Start：Output the start signal, i.e. start the genset.
Auto start/stop
Input port start/stop operation
Set input port as "Remote Start On Load" or "Remote Start Off Load", both could not
be set simultaneously.
Remote Start on Load：When the input is active, genset close relay will active after
genset is normal; when the input inactive, genset will stop automatically.
Remote Start off Load：When the input is active, mains close relay will active after
mains is normal; genset close relay will active when the mains is abnormal while
genset is normal; when the input inactive, genset will stop automatically.
"S1 GEN S2 GEN" start/Stop
When system is "S1 Gen S2 Gen", input port start/stop function is as follows:
Remote Start on Load: Detect S1 or S2 start output according to start mode. Genset
close relay will active after genset is normal.
Remote Start off Load: Detect S1 or S2 start output according to start mode. Both
genset S1 close relay and S2 close relay are deactivated after genset start.
S1,S2 Gens Start Type: Cycs Run, Master Run, Balance Run.
Cycle Run Start:
When remote start is active, S1 and S2 cycle run start according to the cycle run time.
At the first time to start the genset, choose "S1 Start" or "S2 Start" depends on the
"Master Set" information. e.g. S1 start at the first time if "S1 Master" is selected. The
S1 cycle run countdown is started according to the preset delay. At the same time,
genset fault delay will be initiated. If S1 genset is normal before the fault delay has
expired, S1 will take load; S2 start after the preset S1 cycle run delay has expired
and the S2 loading process is same as S1. S1 will stop automatically after the S2 has
take load successfully. S1 and S2 will cycle run in this way alternately until the
remote start signal deactivated.
During the start process, if there is genset fault alarm (genset fault delay overtime or
genset fault input is active), fail to close or load inhibit alarm occurs, the starting
genset will be stop immediately and the additional genset will be start automatically.
During the cycle run process, if "Auto Mode" is selected, the current status will be
hold and the "cycle run countdown" will be suspended.

ATS 420 ATS CONTROLLER USER MANUAL
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Master Run
Mater genset will be start when remote start signal is active. During the start process,
if there is genset fault alarm (genset supply delay overtime or genset fault input is
active), fail to close or load inhibit alarm occurs, the starting genset will be stop
immediately and the additional genset will be start automatically.Otherwise, the
master run genset will running continuously until the remote start signal deactivated.
Balance Run
The gensets which has the shortest running hours will be start when remote start
signal is active. During the start process, if there is genset fault alarm (genset supply
delay overtime or genset fault input is active), fail to close or load inhibit alarm occurs,
the starting genset will be stop immediately and the additional genset will be start
automatically. Otherwise, the current genset will running continuously until the remote
start signal deactivated.
In system "S1 Gen S2 Gen" to start/stop genset should meet following several
conditions:
1) It is active in Auto mode;
2) System set as "S1 Gen S2 Gen"；
3) Output port should be set as "S1 Genset Start" and "S2 Genset Start "；
4) Input port should be set as "S1 Genset Fault Input", "S1 Genset Fault Input" and
"Remote Start On Load" or "Remote Start Off Load";
5) Should set start mode when "S1 Gen S2 Gen" system is selected;
6) Should configure setting "Genset Supply Delay",If start mode is cycle run, also
should set "S1 Cycs Run Time" and "S2 Cycs Run Time";
Among input ports, "S1 Genset Fault Input" and "S2 Genset Fault Input" are
selective setting, Genset fault can be judged by "Genset Supply Delay" and there no
need to inquire the fault alarm via input port.When S1, S2 start type configured as
"Not Used", there is no start genset signals output
Switch operation and ATS power control
Manual mode is selected by pressing the button; a LED besides the button will
illuminate to confirm the operation.
Press S1 button, S1 close relay will active, after the close delay has expired,
S1 close relay will deactivated and the S1 take load. Press S1 button again
(Invalid for the ATS without Open Control), S1 open relay will active, after the open
delay has expired, S1 open relay will deactivated and the S1 off load.
Press S2 button, S2 close relay will active, after the close delay has expired,
S2 close relay will deactivated and the S2 take load. Press S2 button again

ATS 420 ATS CONTROLLER USER MANUAL
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(Invalid for the ATS without Open Control), S2 open relay will active, after the open
delay has expired, S2 open relay will deactivated and the S2 off load.
Automatic operation
Auto mode is selected by pressing the button; a LED besides the button will
illuminate to confirm the operation. The controller will select S1 power or S2 power
according to the preset "master set" and control the genset to start according to the
preset conditions.
ATS Power supply
Switch Power Type can be set as DC Power or AC Power. If DC Power is selected,
then the switch can be transferred at any time (even when both S1 and S2 are
outage). If AC Power is selected, whether the power is normal or not should be
judged according to the ATS power setting and AC power voltage.
The power of ATS is supplied by controller, as long as one power is normal, this can
ensure ATS voltage power supply normally and can be transferred properly.
Users should select power supply voltage (phase voltage or line voltage) based on
ATS type. If choose phase voltage, connect the phase voltage of S1 and S2 (e.g. A
phase) to normally close (Pin25) and normally open (Pin27) contact of auxiliary
output 2; connect N phase of S1 and S2 to normally close (Pin28) and normally open
(Pin30) contact of auxiliary output 3. And then connect the common output of
auxiliary output 2 and auxiliary output 3 to ATS power supplies. Enter into the
parameter setting interface,set the configurable output 2 as "ATS power L1" while set
the configurable output 3 as "ATS power N". If the ATS power supplied by Line
Voltage, same procedures as above but change phase N to phase voltage and the
auxiliary output 3 should be configured according to the set. Wiring diagrams are
shown as following:
AUX.
OUTPUT2
(10A)
25 26 27
ATS Power L1
AUX.
OUTPUT3
(10A)
28 29 30
ATS Power N
A1 A2 N1 N2
ATS Power L ATS Power N
AUX.
OUTPUT2
(10A)
25 26 27
ATS Power L1
AUX.
OUTPUT3
(10A)
28 29 30
ATS Power L2
A1 A2 B1 B2
ATS Power L1 ATS Power L2