COMEPI MS1A31-024 User manual

MS Safety Modules
COMEPI srl Via Novarino 9/L , 23899 Robbiate (lecco) Italy
ENITDEFRESDAZH
Instruction manual
Betriebsanleitung
Manual de instrucciones
Manuale d’istruzione
Manuel d’instructions
Brugervejledning
使用手册

2Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
EN
Table of contents
1. Introduction .......................................................................................................................................................................................................................................... 5
2. Safety ....................................................................................................................................................................................................................................................... 6
2.1 Functional safety ......................................................................................................................................................................................................................... 6
2.2 Lift safety standards ................................................................................................................................................................................................................... 6
3. Installation and environmental conditions ................................................................................................................................................................................7
4. Wiring....................................................................................................................................................................................................................................................... 8
4.1 Power supply ................................................................................................................................................................................................................................ 8
4.2 Wiring .............................................................................................................................................................................................................................................. 8
5. Devices .................................................................................................................................................................................................................................................... 9
5.1 Dimensions ................................................................................................................................................................................................................................... 9
6. MS1A20-024 .......................................................................................................................................................................................................................................... 10
6.1 Terminal layout ............................................................................................................................................................................................................................ 10
6.2 Operating modes ........................................................................................................................................................................................................................ 10
6.2.1 Manual start .......................................................................................................................................................................................................................... 10
6.2.2 Automatic start .................................................................................................................................................................................................................... 11
6.2.3 Monitored manual start ................................................................................................................................................................................................... 11
6.3 Technical data .............................................................................................................................................................................................................................. 12
6.3.1 Timing specification ........................................................................................................................................................................................................... 12
6.3.2 Safety specification ............................................................................................................................................................................................................ 12
6.3.3 Safety parameters............................................................................................................................................................................................................... 12
6.3.4 Power supply ........................................................................................................................................................................................................................ 12
6.3.5 Inputs ...................................................................................................................................................................................................................................... 13
6.3.6 Outputs ................................................................................................................................................................................................................................... 13
6.3.7 Compatibility and conformity ........................................................................................................................................................................................ 13
6.3.8 Environmental...................................................................................................................................................................................................................... 14
6.4 Function description ..................................................................................................................................................................................................................14
6.4.1 Outputs function .................................................................................................................................................................................................................14
6.5 Application .................................................................................................................................................................................................................................... 14
6.5.1 E-stop, safety limit switch and safety interlocks (double channel mode) ...................................................................................................... 14
6.5.2 E-stop, safety limit switch and safety interlocks (single channel mode) ........................................................................................................ 15
6.5.3 E-gate and safety non-contact switches .....................................................................................................................................................................15
6.5.4 Lift levelling application................................................................................................................................................................................................... 16
7. MS1A31-024 .......................................................................................................................................................................................................................................... 18
7.1 Terminal layout ............................................................................................................................................................................................................................ 18
7.2 Operating modes ........................................................................................................................................................................................................................ 18
7.2.1 Manual start .......................................................................................................................................................................................................................... 18
7.2.2 Automatic start .................................................................................................................................................................................................................... 19
7.2.3 Monitored manual start ................................................................................................................................................................................................... 19
7.3 Technical data............................................................................................................................................................................................................................... 20
7.3.1 Timing specification ........................................................................................................................................................................................................... 20
7.3.2 Safety specification............................................................................................................................................................................................................. 20
7.3.3 Safety parameters............................................................................................................................................................................................................... 20
7.3.4 Power supply ........................................................................................................................................................................................................................ 20
7.3.5 Inputs ...................................................................................................................................................................................................................................... 21
7.3.6 Outputs ................................................................................................................................................................................................................................... 21
7.3.7 Compatibility and conformity ........................................................................................................................................................................................ 21
7.3.8 Environmental...................................................................................................................................................................................................................... 22
7.4 Function description ..................................................................................................................................................................................................................22
7.4.1 Outputs function................................................................................................................................................................................................................. 22
7.5 Application .................................................................................................................................................................................................................................... 22
7.5.1 E-stop, safety limit switch and safety interlocks (double channel mode) ...................................................................................................... 22
7.5.2 E-stop, safety limit switch and safety interlocks (single channel mode)......................................................................................................... 23
7.5.3 E-gate and safety non-contact switches .....................................................................................................................................................................23
7.5.4 Lift levelling application................................................................................................................................................................................................... 24

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Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
8. MS1B31-024 .......................................................................................................................................................................................................................................... 26
8.1 Terminal layout .............................................................................................................................................................................................................................26
8.2 Operating modes ........................................................................................................................................................................................................................ 26
8.2.1 Manual start .......................................................................................................................................................................................................................... 26
8.2.2 Automatic start .................................................................................................................................................................................................................... 27
8.2.3 Monitored manual start .................................................................................................................................................................................................... 27
8.3 Technical data .............................................................................................................................................................................................................................. 28
8.3.1 Timing specification ........................................................................................................................................................................................................... 28
8.3.2 Safety specification ............................................................................................................................................................................................................ 28
8.3.3 Safety parameters ............................................................................................................................................................................................................... 28
8.3.4 Power supply ........................................................................................................................................................................................................................ 28
8.3.5 Inputs ...................................................................................................................................................................................................................................... 28
8.3.6 Outputs .................................................................................................................................................................................................................................. 29
8.3.7 Compatibility and conformity ........................................................................................................................................................................................ 29
8.3.8 Environmental ..................................................................................................................................................................................................................... 29
8.4 Function description ................................................................................................................................................................................................................. 30
8.4.1 Outputs function ................................................................................................................................................................................................................ 30
8.5 Application .................................................................................................................................................................................................................................... 30
8.5.1 E-gate, safety limit switch and one access monitoring (double channel mode) ......................................................................................... 30
8.5.2 E-gate, safety limit switch and two accesses monitoring (double channel mode) .....................................................................................31
8.5.3 E-gate, safety limit switch and one access monitoring (single channel mode)............................................................................................31
9. MS1H21-024 .......................................................................................................................................................................................................................................... 32
9.1 Terminal layout .............................................................................................................................................................................................................................32
9.2 Function description ..................................................................................................................................................................................................................32
9.2.1 Two-hands console released .......................................................................................................................................................................................... 32
9.2.2 Two-hands console operated ......................................................................................................................................................................................... 32
9.3 Technical data ...............................................................................................................................................................................................................................33
9.3.1 Timing specification ........................................................................................................................................................................................................... 33
9.3.2 Safety specification ............................................................................................................................................................................................................ 33
9.3.3 Safety parameters ............................................................................................................................................................................................................... 33
9.3.4 Power supply ....................................................................................................................................................................................................................... 33
9.3.5 Inputs ...................................................................................................................................................................................................................................... 34
9.3.6 Outputs .................................................................................................................................................................................................................................. 34
9.3.7 Compatibility and conformity ....................................................................................................................................................................................... 34
9.3.8 Environmental ..................................................................................................................................................................................................................... 35
9.4 Wiring diagram ............................................................................................................................................................................................................................ 35
10. MS1E41-024 .......................................................................................................................................................................................................................................... 36
10.1 Terminal layout ......................................................................................................................................................................................................................... 36
10.2 Application ................................................................................................................................................................................................................................. 36
10.2.1 Extension module in single channel mode ............................................................................................................................................................ 36
10.2.2 Extension module in double channel mode .......................................................................................................................................................... 37
10.2.3 Extension module for MS2/MT2 safety modules with OSSD safety outpout.............................................................................................. 38
10.3 Technical data ............................................................................................................................................................................................................................ 39
10.3.1 Timing specification ........................................................................................................................................................................................................ 39
10.3.2 Safety specification ......................................................................................................................................................................................................... 39
10.3.3 Safety parameters ............................................................................................................................................................................................................ 39
10.3.4 Power supply ..................................................................................................................................................................................................................... 39
10.3.5 Inputs .................................................................................................................................................................................................................................... 39
10.3.6 Outputs ................................................................................................................................................................................................................................ 40
10.3.7 Compatibility and conformity ..................................................................................................................................................................................... 40
10.3.8 Environmental ................................................................................................................................................................................................................... 40
11. LED information ................................................................................................................................................................................................................................... 41
12. Total current ΣIth² ............................................................................................................................................................................................................................. 42

4Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
EN
MS safety modules - Original instruction manual
Ownership
Copyright © 2020, Comepi srl All rights reserved in all countries.
COMEPI reserves the right to modify or make improvements to this document without advance notice.
Safety messages
The following symbols are used in this document to indicate warning concerning the user and/or the safety device:
Service and warranty
In the event of malfunction or requests for information please contact the COMEPI branch or distributor in your
country.
Danger! a potentially risky situation which could lead to death or serious physical injury.
Warning: indicates actions that if not observed may lead to damage to the device.
Attention: only COMEPI technical service personnel are authorized to open the safety device .
General information
Information: This manual should be consulted for all situations related to installation and use. It must be
kept in good condition and in a clean location accessible to all operators.
Maintenance and repairs
The device contains no parts that require maintenance.
In case of failure, do not open the device; the device must be sent to COMEPI branch or distributor.

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Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
1. Introduction
Validity of documentation
This documentation is valid only for MS1 safety modules and until new documentation is published.
This instruction manual describes the function, operation and installation of the product.
It is the user responsibility to decide if the safety module is correctly suited to the application
MS1A31-024
MS1A20-024 MS1B31-024 MS1H21-024 MS1E41-024
1 Emergency stop •
2 Emergency gate •
3 E-gate with antivalent function (1NC + 1NO) •
4 Limit switch •
5 Limit switch with antivalent function (1NC + 1NO) •
6 Non-contact switch •
7 Non-contact switch with antivalent function (1NC + 1NO) •
8 Lift levelling •
9 Two-hand control device •
10 Relay expansion unit •
Description
The MS1 safety modules are compliant with international standards, designed to provide the most comprehensive protection
for equipment and personnel. They enable safety functions, accepting dierent types of inputs.
All rights of this document are reserved by Comepi srl.
How to use the documentation
This user manual must be read and completely understood by personnel dealing with all the uses of the safety modules
prior to carrying out any operation involving the module.
Please keep this document for future reference.
All the operations described in this manual must be carried out exclusively by specialized personnel, carefully following
all the instructions given.
Use of the product
These safety modules are able to monitor multiple safety functions of industrial machinery, protecting operators from
dangerous operations of the machine.
The MS1 modules provide a safety-related interruption of a safety circuit.
The safety modules are compliant with the requirements of EN ISO 13849-1 and EN 81-20 and EN 81-50 (only MS1A31-024
and MS1A20-024) and may be used in applications with:

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EN
2. Safety
2.1. Functional safety
The EC machinery directive stipulates that machinery should not pose a danger (risk assessment in accordance with EN
ISO 12100). Given that there is no such thing as zero risk in technology, the aim is to achieve an acceptably low level
of risk. If safety is dependent on control systems, these must be designed so that the probability of functional faults is
suciently low.
To meet this requirement, the user can apply the harmonized standards like EN ISO 13849-1.
Before using a MS1 module it is necessary to perform a safety assessment in accordance with the Machinery Directive.
Functional safety is guaranteed for the product as a single component. However, this does not guarantee the functional
safety of the overall system. In order to achieve the required safety level for the overall system, the safety requirements fo r
the plant/machine must be dened, and then how these requirements must be implemented.
MS1 modules are built to the following safety levels: PL e, Cat. 4, in accordance with the EN ISO 13849-1. However, the
denitive PL of the application will depend on the number of safety components, their parameters and the connections that
are made, as per the risk analysis.
An in-depth risk analysis must be performed to determine the appropriate safety level for each specic application, on the
basis of all the applicable standards.
Installation of the MS1 module is the sole responsibility of the installer or the user.
The device must be installed in accordance with the specic risk analysis of the application and all the applicable
standards.
Comepi is not responsible for these operations or for any risks in connection with them. Reference should be made
to the manual and to the relative product and/or application standards to ensure correct use of any devices connected to
the MS1 module within the specic application.
The ambient temperature where the system is installed must be compatible with the operating temperature parameters
stated on the product label and in the specications.
For all matters concerning safety, if necessary contact your country’s ocial safety authority or trade association.
2.2 Lift Safety Standards
In 2014 The European Committee for Standardization released two new safety standards for the construction of lifts and
for the testing of lift components. Both new standards applied to both passenger and goods lifts.
EN 81-20 denes the technical requirements for the construction of lifts.
EN 81-50 denes design rules, calculations and tests for lift components.
The MS1A31-024 and MS1A20-024 modules are compliant with these Standards (EN 81-20 and EN 81-50).

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Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
3. Installation and environmental conditions
Warning:
MS1 must be installed in a control cabinet with a protection grade of at least IP54, otherwise dampness or
dust may lead to malfunction.
Warning:
Avoid installation during thunderstorms.
Danger!
If the safety module is tampered, it can no longer ensure the safety of the operator and the warranty is void.
Information:
Use the notch on the rear of the unit to attach it to a DIN rail.
Ensure the unit is mounted securely on a DIN rail (35 mm) by using a xing element (e.g. retaining bracket
or an end angle).
Information:
Do not dispose of the packaging in the environment.
Information:
MS1 must only be used within an ambient temperature range of -25 ÷ +60°C (-13 ÷ +140°F); UL: +40°C
(+104°F), away from any condensation or conducting uids. To avoid possible interference, keep the
connecting conductors separate from the power conductors.

8Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
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4.1 Power supply
4.2 Wiring
4. Wiring
24Vdc ± 10%; 24Vac -15%/+10%, 50÷60 Hz, Class 2, overvoltage category III.
1Warning:
Max. terminal tightening torque: 0.5Nm (for all connections)
2Warning:
Switch power supply OFF before wiring the device
3
To prevent contact welding, a fuse should be connected on the output contacts.
Sufficient fuse protection must be provided on all output contacts with capacitive and inductive
loads.
Ensure the wiring and EMC requirements of IEC 60204-1 are met.
4
Information:
It is good practice to separate the power supply of the control unit from that of other electrical
devices (e.g. frequency drives, electric motors, inverters) or other sources of disturbance.
5Information:
Use conductors with section: 0,2 - 2,5 mm² (24 - 14 AWG)
6Do not exceed the electrical ratings.
The safety modules are equipped with pluggable terminal blocks for easy wiring and devices exchange.
Procedure:
• Switch power supply OFF before wiring the device
• Insert the screwdriver in the recess of the terminal block and lift it to remove it. Do not remove the terminals blocks by
pulling the cables!
• Once the wiring of the terminal block is completed, insert the terminal block into the respective position
The plug-in terminal blocks are coded, so to prevent inserting the terminal blocks in the wrong position.
1
2

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Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
5. Devices
MS1 modules are compliant with international standards, designed to provide the most comprehensive protection for
equipment and personnel. They enable safety functions, accepting dierent types of inputs.
MS1 safety modules and expansion unit provide for safety instantaneous relay outputs.
MS1A20-024 MS1A31-024 MS1B31-024 MS1H21-024 MS1E41-024
NO safety outputs 2 3 3 2 4
Aux NC output - 1 1 1 1
Input type 2 NO 2 NO 1NO + 1NC 2-hand control
2NO
2 NO or
2 OSSD
5.1 Dimensions
17.5mm
[0,69”]
115.8mm [4,56”]
121.1mm [4,77”]
107mm [4,2”]
110.8mm [4,36”]
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Power
Input 1
Input 2
Channels
X3
A2
A1
X2
S22
S12
X1
S21
S11
13
23
14
24
41
42
33 34
MS1A31-024
sdnaH2 eludomytefas
eludoMytefaS
Power
Input1
Input2
Channels
34
A2
A1
Y2
S22
S12
Y1
S21
S11
13
23
14
24
31
32
MS1H21-024
sdnaH2 eludomytefas
eludoMytefaS
Power
Input1
Input2
Channels
A2
A1
X2
S22
S12
X1
S21
S11
13
23
14
24
X3
MS1A20-024
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f
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MS1B31-024
Power
Input1
Input2
Channels
X3
A2
A1
X2
S22
S12
X1
S21
S11
13
23
14
24
41
42
33 34
sdnaH2 elu
d
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eludoMytefaS
Power
Input1
Input2
Channels
X3
A2
A1
X2
S22
S12
X1
S21
S11
13
23
14
24
41
42
33 34
MS1A31-024
s
d
n
a
H
2 e
lu
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Power
Input1
Input2
Channels
A2
A1
52
S22
S12
51
S21
S11
13
23
14
24
43
44
33 34
MS1E41-024

10 Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
EN
6.2 Operating modes
6.2.1 Manual start
X3 X2 X1
Start A
The start button is connected between X1 and X2.
The safety inputs S12 and S22 are operated:
• contact closed between S11 and S12
• contact closed between S21 and S22
The start button is pressed and the safety outputs switch ON
BThe opening of at least one safety input contact forces
immediately the safety outputs to the open state
CA new operating cycle is possible only after releasing both
input contacts and then operating them again
Reset / Start
Input ch 1
Input ch 2
Safety output
Ts
∞
Ta
<160ms
Tr
<20ms
Ts Ta Tr Ts Ta Tr
The MS1A20-024 module monitors emergency stops, limit switches, magnetic switches according to 2006/42/CE Machinery
Directives.
The MS1A20-024 is also used for oor levelling and relevelling of lift cabin, according to the 2014/33/EU Lift Directive, in lift
applications.
6. MS1A20-024
X1-X2: manual start / automatic start
X1-X3: monitored manual start
S11-S12: channel 1 NO input
S21-S22: channel 2 NO input
A1: power supply 24 Vdc (+)/Vac(~)
A2: power supply 24 Vdc (-)/Vac(~)
13-14: NO safety output
23-24: NO safety output
6.1 Terminal layout
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eludoMytefaS
Power
Input 1
Input 2
Channels
X3
A2
A1
X2
S22
S12
X1
S21
S11
13
23
14
24
MS1A20-024

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Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
6.2.2 Automatic start
X3
X1
X2
A
Connection between X1 and X2.
The safety inputs S12 and S22 are operated:
• contact closed between S11 and S12
• contact closed between S21 and S22
The safety outputs switch ON
BThe opening of at least one safety input contact forces
immediately the safety outputs to the open state
CA new operating cycle is possible only after releasing both
input contacts and then operating them again
Reset / Start
Input ch 1
Input ch 2
Safety output
Ts
∞
Ta
<160ms
Tr
<20ms
Ts Ta Tr Ts Ta Tr
6.2.3 Monitored manual start
X3 X1 X2
Start A
The start button is connected between X1 and X3.
The safety inputs S12 and S22 are operated:
• contact closed between S11 and S12
• contact closed between S21 and S22
The start button can be pressed at least 500ms after the
safety inputs are operated, to enable the safety outputs to
the active state
BThe opening of at least one safety input contact forces
immediately the safety outputs to the open state
CA new operating cycle is possible only after releasing both
input contacts and then operating them again
Reset / Start
Input ch 1
Input ch 2
Safety output
Ts
∞
Td
> 500ms
Ta
<160ms
Tr
<20ms
Ts Td
< 500ms
Ts

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Warning:
EN 81-20 denes the technical requirements for lift construction.
EN 81-50 provides the framework for design and testing of lift components
6.3.2 Safety specication
Safety outputs 13-14 and 23-24
Safe state of outputs Open
Safety inputs S12-S11 and S22-S21
Safe state of inputs Open
Safety function
1. The release of either one or both safety inputs will release the safety
outputs.
2. The re-activation of the safety outputs is only possible after the release
of both safety inputs.
6.3 Technical data
6.3.1 Timing specication
Activation time Ta < 160ms
Release time Tr Double channel mode: < 20ms
Single channel mode: < 160ms
Simultaneity Ts Infinite
Monitored manual start delay Td > 500ms
Information:
• The start/restart command must be installed outside the danger area in a position where the concerned
danger and entire working area are clearly visible.
• It must not be possible to reach the start/restart command from the inside of the danger area.
Attention:
Use in manual start mode is mandatory where the safety device controls an access protecting a danger
zone. This is to prevent a situation in which, once a person has passed through the opening, they could
remain in the danger zone without being detected. Failure to comply with this rule may result in serious
risks to people exposed.
6.3.3 Safety parameters
ISO 13849-1 Safety Category Cat. 4
ISO 13849-1 Performance Level PL e
DIN EN 81-20 Certied
DIN EN 81-50 Certied
MTTF D[a] 420,8
PFH D[1/h] 1,85 E-10
DCavg 99%
ß5,00 E-02
ßD2,00 E-02
6.3.4 Power supply
Power supply
24 Vdc ±10%, 2 W, Class 2
24 Vac -15/+10% 50÷60 Hz, 4.5 VA, Class 2
Overvoltage category III
Short circuit protection internal PTC
Rated insulation voltage 4 kV

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Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
6.3.5 Inputs
Number of safety channels 2
Safety inputs (contact inputs) S11-S12 and S21-S22
Loop resistance Max. 1 kΩ
Input current Typical 5 mA
6.3.6 Outputs
Number of NO safety outputs 2
Type Voltage free contact output, relays with forcibly guided contacts
Max current rating - single output: @ 60°C (140°F) operating temperature:
EN60947-5-1 AC 1: 250V / 6A / 2000 VA - AC 15: 230V / 3A
DC 1: 24V / 6A - DC 13: 24V / 2.5A / 0.1 Hz
UL508 Pilot duty: B300 / R300
Max. total current ΣIth²: Spacing between modules ≥100mm: 72A² @40°C (104°F) ambient
temperature
Modules mounted stacked: 26A² @25°C (77°F) ambient temperature
Please refer to the derating curves in chapter 12
EN60947-5-1
UL508 Pilot duty: B300 / R300
Mechanical life > 10 7 operations
Electrical life AC1 (360 s/h) ~ 10 5 operations
6.3.7 Compatibility and conformity
Low Voltage Directive 2014/35/EU
EN 60947-5-1 Low-voltage switchgear and controlgear - Control circuit devices and
switching elements - Electromechanical control circuit devices
EMC Directive 2014/30/EU
EN 60947-5-1 Low-voltage switchgear and controlgear - Control circuit devices and
switching elements - Electromechanical control circuit devices
Machinery Directive 2006/42/EC EC type examined by TÜV - Cert. no. 44 205 15058308
EN ISO 13849-1 Safety of machinery - safety related parts of control systems - General
principles for design
EN60204-1 Safety of machinery - Electrical equipment of machines - General
requirements E-stop category 0
EN 61326-3-1
Electrical equipment for measurement, control and laboratory use. EMC
requirements. Immunity requirements for safety-related systems and
for equipment intended to perform safety-related functions (functional
safety) - General industrial applications
Lift Directive 2014/33/EU EU type examined by TÜV - Cert. no. 44 208 15058308
EN 81-20 Safety rules for the construction and installation of lifts.
Part 20: passenger and goods passenger lifts
EN 81-50
Safety rules for the construction and installation of lifts.
Part 50: design rules, calculations, examinations and tests of lift
components
EN 12015 Electromagnetic compatibility. Product family standard for lifts,
escalators and passenger. Emission
EN 12016 Electromagnetic compatibility. Product family standard for lifts,
escalators and passenger. Immunity
Approvals

14 Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
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Not only must the output be safe, but also the complete wiring and surroundings. In order to reach cat. 4 of functional
safety, two outputs must be wired as a pair, so that a defect of one output cannot cause a total loss of safety, as the other
one of the pair is still able to switch o the dangerous parts of the plant (or machine). So wiring similar to the following
has to be done:
6.4.1 Outputs function
AThe NO safety outputs switch on (contact closes) when the
safety inputs are active and the start/reset is pressed.
BIn case of intervention of the safety inputs, the NO safety
outputs are switched o
CIf the power supply fails, the NO safety outputs are switched
o
6.4 Function description
A1
A2
X1 X2
S11 S12 S21 S22
13
14
23
24
M1
3~
M
K1
K2
Manual start
L
N
E-STOP Pwr 24V (+/~)
Pwr 24V (-/~)
X3
6.5.1 E-stop, safety limit switch and
safety interlocks (double channel mode)
A
A cross circuit between the two channels will be recognized
B In case of a fault the safety outputs will switch OFF
6.5 Application
A1
A2
X1 X2
S11 S12 S21 S22
13
14
23
24
M1
3~
M
K1
K2
Manual start
L
N
E-STOP Pwr 24V (+/~)
Pwr 24V (-/~)
X3
Information:
You must comply with the safety-related parameters in order to ensure the required safety level for your
plant/machine. All the units which use a safety function must be considered when calculating the overall
safety level.
6.3.8 Environmental
Protection grade IP40 on frontal part of the housing, IP20 on the terminals. The device
has to be installed in a cabinet with protection degree of IP54.
Pollution degree 2
Operating Temperature -25 ÷ +60°C (-13 ÷ 140°F), UL: +40°C (104°F);
(tested @ temp 65°C (149 °F) as per lift norm)
Storage Temperature -30 ÷ +70°C (-22 ÷ 158°F)
Ambient humidity range R.H. ≤95% non condensing

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Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
6.5.2 E-stop, safety limit switch and
safety interlocks (single channel mode)
A
A cross circuit between the two channels will be recognized
B In case of a fault the safety outputs will switch OFF
A1
A2
X1 X2
S11 S12 S21 S22
13
14
23
24
M1
3~
M
K1
K2
L
N
Pwr 24V (-/~)
E-STOP
Pwr 24V (+/~)
Manual start
X3
Information: the release time in single channel mode is < 160 ms
6.5.3 E-gate and safety non-contact
switches
A
A cross circuit between the two channels will be recognized
B In case of a fault the safety outputs will switch OFF
E-gate
Sensor 1
Sensor 2
Pwr 24V (+/~)
A1
A2
X1 X2
S11 S12 S21 S22
13
14
23
24
M1
3~
M
K1
K2
L
N
Pwr 24V (-/~)
Manual start
X3

16 Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
EN
6.5.4 Lift levelling application
The MS1A20-024 is designed to be employed in lift plants for oor levelling and relevelling of the cabin, according to the
requirements of EN 81-20 and EN 81-50 Standards, and according to the 2014/33/EU Lift Directive.
Re-Levelling
sensors
Lift
controller
K1
N
Drive
Safety
circuit of cabin
landing and
cabin doors
L
Lift controller
N
Sensor 1
Sensor 2
Pwr 24V (+/~)
A1
A2
X1 X2
S11 S12 S21 S22
13
14
23
24
L
Pwr 24V (-/~)
Start
X3
Information:
Lift car levelling safety module, designed according to Lift Directive 2014/33/EU and to safety circuit
requirements of EN 81-20, EN 81-50 Standards.
Information:
EN81-20: Safetyrulesforthe construction andinstallationoflifts. Part20:passenger and goods/passenger
lifts.
EN 81-50: Safety rules for the construction and installation of lifts. Part 50: design rules, calculations,
examinations and tests of lift components.
Lift levelling with magnetic sensors
A
The module monitors the two re-levelling sensors and when the
cabin is in the re-levelling zone, it enables the safety outputs.
One safety output must be connected to bypass the circuit
that monitors the cabin landing and cabin doors, when the lift
cabin is inside the re-levelling zone; further to the landing and
re-levelling of the cabin at the oor, the safety module detects
eventual faults and the lift controller will stop the lift.
B
The inputs S12, S22 are connected to the re-levelling zone
sensors

17
EN
Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
Information:
Lift car levelling safety module, designed according to Lift Directive 2014/33/EU and to safety circuit
requirements of EN 81-20, EN 81-50 Standards.
Information:
EN81-20: Safety rulesfortheconstruction and installationoflifts.Part 20:passengerandgoods/passenger
lifts.
EN 81-50: Safety rules for the construction and installation of lifts. Part 50: design rules, calculations,
examinations and tests of lift components.
Lift levelling with photosensors
A
The module monitors the two re-levelling sensors and when the
cabin is in the re-levelling zone, it enables the safety outputs.
One safety output must be connected to bypass the circuit
that monitors the cabin landing and cabin doors, when the lift
cabin is inside the re-levelling zone; further to the landing and
re-levelling of the cabin at the oor, the safety module detects
eventual faults and the lift controller will stop the lift.
B
The inputs S12, S22 are connected to the re-levelling zone
sensors
Pwr 24V (+/~)
A1
A2
X1 X2
S11 S12 S21 S22
13
14
23
24
L
Pwr 24V (-/~)
X3
Re-Levelling
sensors
Sensor 1
Sensor 2
BNBKBU
NPN
PNP
+ -
BN BK BU
Lift
controller
K1
N
Drive
Safety
circuit of cabin
landing and
cabin doors
L
Lift controller
N Start

18 Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
EN
7.2 Operating modes
7.2.1 Manual start
X3 X2 X1
Start
A
The start button is connected between X1 and X2.
The safety inputs S12 and S22 are operated:
• contact closed between S11 and S12
• contact closed between S21 and S22
The start button is pressed and the safety outputs switch
ON, while the auxiliary output opens
BThe opening of at least one safety input contact forces
immediately the safety outputs to the open state
CA new operating cycle is possible only after releasing both
input contacts and then operating them again
Reset / Start
Input ch 1
Input ch 2
Safety output
Auxiliary output
Ts
∞
Ta
<160ms
Tr
<20ms
Ts Ta Tr Ts Ta Tr
The MS1A31-024 module monitors emergency stops, limit switches, magnetic switches according to 2006/42/CE Machinery
Directives.
The MS1A31-024 is also used for oor levelling and relevelling of lift cabin, according to the 2014/33/EU Lift Directive, in lift
applications.
7. MS1A31-024
X1-X2: manual start / automatic start
X1-X3: monitored manual start
S11-S12: channel 1 NO input
S21-S22: channel 2 NO input
A1: power supply 24 Vdc (+)/Vac(~)
A2: power supply 24 Vdc (-)/Vac(~)
13-14: NO safety output
23-24: NO safety output
33-34: NO safety output
41-42: NC auxiliary output
7.1 Terminal layout
sdnaH2 eludomytefas
eludoMytefaS
Power
Input 1
Input 2
Channels
X3
A2
A1
X2
S22
S12
X1
S21
S11
13
23
14
24
41
42
33 34
MS1A31-024

19
EN
Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
7.2.2 Automatic start
X3
X1
X2
A
Connection between X1 and X2.
The safety inputs S12 and S22 are operated:
• contact closed between S11 and S12
• contact closed between S21 and S22
The safety outputs switch ON, while the auxiliary output
opens
BThe opening of at least one safety input contact forces
immediately the safety outputs to the open state
CA new operating cycle is possible only after releasing both
input contacts and then operating them again
Reset / Start
Input ch 1
Input ch 2
Safety output
Auxiliary output
Ts
∞Ta
<160ms
Tr
<20ms
Ts Ta Tr Ta Tr
7.2.3 Monitored manual start
X3 X1 X2
Start
A
The start button is connected between X1 and X3.
The safety inputs S12 and S22 are operated:
• contact closed between S11 and S12
• contact closed between S21 and S22
The start button can be pressed at least 500ms after the
safety inputs are operated, to enable the safety outputs to
the active state; when the safety outputs switch ON, the
auxiliary output opens
BThe opening of at least one safety input contact forces
immediately the safety outputs to the open state
CA new operating cycle is possible only after releasing both
input contacts and then operating them again
Reset / Start
Input ch 1
Input ch 2
Safety output
Auxiliary output
Ts
∞
Td
> 500ms
Ta
<160ms
Tr
<20ms
Ts Td
< 500ms
Ts

20 Rev. 1 | 01/2020 | MS Safety Module | © 2020 | Comepi srl
EN
7.3.3 Safety parameters
ISO 13849-1 Safety Category Cat. 4
ISO 13849-1 Performance Level PL e
DIN EN 81-20 Certied
DIN EN 81-50 Certied
MTTF D[a] 420,8
PFH D[1/h] 1,85 E-10
DCavg 99%
ß5,00 E-02
ßD2,00 E-02
Information:
• The start/restart command must be installed outside the danger area in a position where the concerned
danger and entire working area are clearly visible.
• It must not be possible to reach the start/restart command from the inside of the danger area.
Attention:
Use in manual start mode is mandatory where the safety device controls an access protecting a danger
zone. This is to prevent a situation in which, once a person has passed through the opening, they could
remain in the danger zone without being detected. Failure to comply with this rule may result in serious
risks to people exposed.
7.3 Technical data
7.3.1 Timing specication
Activation time Ta < 160ms
Release time Tr Double channel mode: < 20ms
Single channel mode: < 160ms
Simultaneity Ts Infinite
Monitored manual start delay Td > 500ms
7.3.2 Safety specication
Safety outputs 13-14, 23-24 and 33-34
Safe state of outputs Open
Safety inputs S12-S11 and S22-S21
Safe state of inputs Open
Safety function
1. The release of either one or both safety inputs will release the safety
outputs.
2. The re-activation of the safety outputs is only possible after the release
of both safety inputs.
Warning:
EN 81-20 denes the technical requirements for lift construction.
EN 81-50 provides the framework for design and testing of lift components
7.3.4 Power supply
Power supply
24 Vdc ±10%, 2 W, Class 2
24 Vac -15/+10% 50÷60 Hz, 4.5 VA, Class 2
Overvoltage category III
Short circuit protection internal PTC
Rated insulation voltage 4 kV