Leuze MC3 Series User manual

MC3x
Magnetically coded sensors with MSI-MC3x safety relays
Original operating instructions
EN • 2021-08-20 • 700021
We reserve the right to make technical changes

Leuze electronic GmbH + Co. KG MC3x 2
© 2021
Leuze electronic GmbH + Co. KG
In der Braike 1
D-73277 Owen - Teck / Germany
Phone: [phone]
Fax: [phone]
http://www.leuze.com
[email protected]

Leuze electronic GmbH + Co. KG MC3x 3
1 About this document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Other applicable documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Used symbols and signal words . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Intended use and foreseeable misuse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.1 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.2 Foreseeable misuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Competent persons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3 Responsibility for safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4 Exemption of liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Device overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1 Start/restart interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2 Automatic start/restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.3 Contactor monitoring (EDM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1 Selecting the position and arrangement of sensor and actuator . . . . . . . . . . . . . . . . . . . . 20
6.2 Mounting and aligning sensor and actuator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.2.1 Checklist - correct mounting of sensor and actuator . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.3 Mounting the safety relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.1 Terminal assignments of the safety relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.1.1 MSI-MC310 safety relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.1.2 Pin assignment of sensors (1NC/1NO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.1.3 MSI-MC311 safety relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.2 Pin assignment of sensors (2NO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.3 Connection examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.3.1 Connection examples with MC3xS1x sensors and MSI-MC310 safety relay . . . . . . . . 33
7.3.2 Connection examples with MC3xS2x sensors and MSI-MC311 safety relay . . . . . . . . 35
7.4 Connecting to the machine control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7.5 Switching on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7.6 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7.7 Unlocking start/restart interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.1 Before the initial start-up and following modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.1.1 Checklist – before the initial start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.2 To be performed periodically by competent persons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.3 To be performed daily by the operating personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.3.1 Check list – daily or at change of shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
9 Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Leuze electronic GmbH + Co. KG MC3x 4
10 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
10.1 What to do in case of failure? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
10.2 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
11 Disposing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
12 Service and support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
13 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
13.1 Magnetically coded sensors, actuator, contact set S1 (1NC/1NO) . . . . . . . . . . . . . . . . . . 47
13.2 Magnetically coded sensors, actuator, contact set S2 (2NO) . . . . . . . . . . . . . . . . . . . . . . 48
13.3 MSI-MC310 safety relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
13.4 MSI-MC311 safety relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
14 Certified combinations of safety relays and magnetic sensors . . . . . . . . . . . . . 55
15 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
16 EC Declaration of Conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

About this document
Leuze electronic GmbH + Co. KG MC3x 5
1 About this document
1.1 Other applicable documents
The information on the MC3x magnetically coded sensor is divided into two documents. Document "MC3x
application information" contains only the most important safety notices.
For safe implementation, testing and operation, you must download document "MC3x magnetically coded
sensors with MSI-MC3x safety relays, safe implementation and operation" (this document) from http://
www.leuze.com/.
Table 1.1: Documents on the MC3x magnetically coded sensors with safety relay
1.2 Used symbols and signal words
Table 1.2: Warning symbols and signal words
Table 1.3: Other symbols
Table 1.4: Terms and abbreviations
Purpose and target group Title Source
Detailed information for all
users
MC3x magnetically coded sensors
with MSI-MC3x safety relay
Safe implementation and operation
On the Internet, download from:
http://www.leuze.com/
Basic information for techni-
cians and operating com-
pany
MC3x magnetically coded sensors
with MSI-MC3x safety relay
Application information
Print document part no. 70002
included in the delivery contents
of the magnetically coded sensor
Symbol indicating dangers to persons
NOTE Signal word for property damage
Indicates dangers that may result in property damage if the measures for danger
avoidance are not followed.
CAUTION Signal word for minor injuries
Indicates dangers that may result in minor injury if the measures for danger
avoidance are not followed.
WARNING Signal word for serious injury
Indicates dangers that may result in severe or fatal injury if the measures for dan-
ger avoidance are not followed.
DANGER Signal word for life-threatening danger
Indicates dangers with which serious or fatal injury is imminent if the measures
for danger avoidance are not followed.
Symbol for tips
Text passages with this symbol provide you with further information.
Symbol for action steps
Text passages with this symbol instruct you to perform actions.
EDM External Device Monitoring
OSSD Output Signal Switching Device
RES Start/REStart interlock

About this document
Leuze electronic GmbH + Co. KG MC3x 6
1.3 Checklists
The checklists (see chapter 8 "Testing") serve as a reference for the machine manufacturer or supplier.
They replace neither testing of the complete machine or system prior to the initial start-up nor their periodic
testing by a competent person. The checklists contain minimum testing requirements. Depending on the
application, other tests may be necessary.
PDDB Magnetically coded sensors (Proximity Devices with defined behaviour under
Fault conditions)
PFHdProbability of a dangerous failure per hour
Probability of dangerous Failure per Hour
MTTF Mean time to dangerous failure
Mean Time To Failure
PL Performance Level
2NO Two contacts in "open" state without the presence of an actuator
xxx Placeholder for version

Safety
Leuze electronic GmbH + Co. KG MC3x 7
2 Safety
Before using the MC3x series, a risk assessment must be performed according to valid standards (e.g.
EN ISO 12100, EN ISO 13849-1). The result of the risk assessment determines the required safety level
of the safety relay, sensor and actuator.
The realizable category of integration in control circuits acc. to EN ISO 13849-1 is dependent on the used
contact block, wiring and evaluation.
For mounting, operating and testing, document "MC3x magnetically coded sensors with MSI-MC3x safety
relay", application information as well as all applicable national and international standards, regulations,
rules and directives must be observed. Relevant and supplied documents must be observed, printed and
handed to the affected personnel.
Before working with the safety relay, sensor and actuator, completely read and understand the docu-
ments applicable to your task.
In particular, the following national and international legal regulations apply for the commissioning, tech-
nical inspections and work with safety components:
• Machinery directive 2006/42/EC
• Electromagnetic compatibility 2014/30/EU
• EN ISO 14119, interlock devices associated with guards
• EN 60204-1, Electrical equipment of machines
• EN 60947-5-3, Requirements for proximity switches
• Use of work equipment directive 89/655/EEC supplemented by directive 95/63 EC
• OSHA 1910 Subpart 0
• Safety regulations
• Accident-prevention regulations and safety rules
• Ordinance on Industrial Safety and Health and employment protection act
• Device Safety Act
2.1 Intended use and foreseeable misuse
NOTE
For safety-related information you may also contact local authorities (e.g., industrial inspec-
torate, employer's liability insurance association, labor inspectorate, occupational safety and
health authority).
WARNING!
A running machine can cause severe injuries!
Make certain that, during all conversions, maintenance work and i n s p e c t i o n s , t h e s y s t e m i s
securely shut down and protected against being restarted.

Safety
Leuze electronic GmbH + Co. KG MC3x 8
2.1.1 Intended use
• Safety relay, sensor and actuator are intended for use in protective door monitoring in accordance
with EN ISO 14119 and EN 60947-5-3.
• They are used for the safety-related monitoring of moveable guards and, thus, for the protection of
persons at entry or access areas of points of operation on machines and systems (e.g., protective
door, sliding gate, protection hoods).
• The safety relay, sensor and actuator may only be used after they have been selected in accordance
with the respectively applicable instructions and relevant standards, rules and regulations regarding
labor protection and safety at work, and after they have been installed on the machine, connected,
commissioned, and checked by a competent person.
• When selecting the safety relay, sensor and actuator it must be ensured that their safety-related
capabilities meet or exceed the required Performance Level PLr ascertained in the risk assessment.
For the table of safety-related characteristic parameters, see chapter 13 "Technical data".
• The MC3x sensors may only be operated with the approved MC3x actuators and safety relays from
Leuze (see table 14.1). Proper function with respect to safety can be ensured only if compatible com-
ponents are used.
• Safety relay, sensor and actuator must be in perfect condition and periodically inspected by compe-
tent persons.
• If the point of operation can be reached within the stopping time of the dangerous process, a safety
locking device must be used instead of the magnetically coded sensor.
• The protective device must be dimensioned and mounted in such a way that reaching or stepping
around is not possible.
• MC3x only reports persons upon opening of the guard, not whether persons are located in the dan-
ger zone. For this reason, a start/restart interlock in the safety chain is essential for access safe-
guarding.
• Sensor and actuator must be connected to the fixed or moveable guard in a permanent and tamper-
proof manner. The mounting conditions must be observed (see chapter 6 "Mounting").
• The sensors and their actuators are to be protected against strong physical shocks and vibrations.
Observe the permissible environmental conditions for storage and operation (see chapter 13 "Tech-
nical data").
• Sensor and actuator must be protected against foreign bodies (e.g., iron filings and blasting agents).
• The normally closed contacts of the respective evaluation units are used for state signaling. Use as
safety-related contacts is not permitted.
• Sensor and actuator must be connected in such a way that a dangerous process can only be acti-
vated while the protective device is closed and so that a stop command that ends the dangerous pro-
cess is triggered upon opening of the protective device.
• Cable gland, insulation materials and connecting wires of the appropriate degree of protection are to
be used.
• Safety relay, sensor and actuator must be replaced after a maximum of 20 years (see chapter 13
"Technical data"). Repairs or the exchange of wear parts do not extend the mission time.
• Damaged components must be replaced immediately.
• Sensor or actuator must neither be tampered with nor may their correct position be changed.
• External magnets must not be used nor may the contacts be bridged.
• No structural changes may be made to safety relay, sensor or actuator. When manipulating, the pro-
tective function is no longer guaranteed. In addition, all guarantee claims against the manufacturer
shall no longer apply.

Safety
Leuze electronic GmbH + Co. KG MC3x 9
2.1.2 Foreseeable misuse
Any use other than that defined under the approved purpose or which goes beyond that use of the safety
relay, sensor and actuator is considered improper use!
Safety relay, sensor and actuator must not be used under the following conditions, .e.g.:
• The safety of multiple persons is dependent on the function of the safety relay, sensor and actuator
(e.g. nuclear power plants, trains, aircraft, motor vehicles, incinerators, medical devices)
• Where subjected to strong physical shocks or in potentially explosive or easily flammable atmo-
spheres
• Danger posed by ejected objects or the spraying of hot or hazardous liquids from within the danger
zone
• Detection of the presence of persons in danger zones
• Looping into the safety circuit parts that are not relevant to safety
• The combination of non-approved parts with safety relay, sensor or actuator
• Combination with non-compatible controls (current limiting, logic)
• Mounting positions that enable reaching or stepping around
• Using the sensor or actuator as limit stop
• Insufficiently stable mounting locations or unsecured mounting of sensor or actuator
• Mounting on ferromagnetic materials.
2.2 Competent persons
Prerequisites for competent persons:
• They have a suitable technical education.
• They know the rules and regulations for labor protection, safety at work and safety technology and
can assess the safety of the machine.
• They know the instructions for the safety components and the machine.
• They have been instructed by the responsible person on the mounting and operation of the machine,
the safety relay and the sensor with actuator.
2.3 Responsibility for safety
Manufacturer and operating company must ensure that the machine and used safety relay, sensor and
actuator function properly and that all affected persons are adequately informed and trained.
The type and content of all imparted information must not lead to unsafe actions by users.
The manufacturer of the machine is responsible for:
• Safe machine construction
• Safe implementation of safety relay, sensor and actuator
• Imparting all relevant information to the operating company
• Adhering to all regulations and directives for the safe commissioning of the machine
The operating company is responsible for:
• Instructing the operator
• Maintaining the safe operation of the machine
• Adhering to all regulations and directives for labor protection and safety at work
• regular testing by competent persons

Safety
Leuze electronic GmbH + Co. KG MC3x 10
2.4 Exemption of liability
Leuze electronic GmbH & Co. KG is not liable in the following cases
• Safety relay, sensor and actuator are not used as intended
• Reasonably foreseeable misuse is not taken into account
• Safety notices are not adhered to
• Mounting and electrical connection are not properly performed
• Proper function is not tested (see chapter 8 "Testing").
• Combination of sensor and actuator with controls,
• which have not been designed to be safety-oriented
• for which the current limits are not compatible
• which have not been programmed to be compatible with the respective contact set
• although a PDDB system certified in accordance with EN 60947-5-3 was intended, excluded here
are the combinations certified by Leuze (see table 14.1)

Device description
Leuze electronic GmbH + Co. KG MC3x 11
3 Device description
The sensor system consists of the MC3x sensor, the MC3xA actuator and the corresponding MSI-MC3x
safety relay. In the following, this document describes only the use of the magnetic sensors in combination
with the two safe evaluation units MSI-MC310 and MSI-MC311.
For additional combinations of MC3x magnetic sensors with other safe evaluation units from Leuze, see
table 14.1. The evaluation units listed there are described in detail in the respective, separate operating
instructions.
The sensor contains a special combination of reed contacts that are contactlessly activated by the coded
magnetic field of the actuator. For guards that are accessible from behind, a reset button (RES) can be
connected to the MSI-MC3x for manual starting. Evaluation of the RES signal is monitored edge-depen-
dent.
If, for example, a door is opened, the actuator mounted here is separated from the sensor, which is located
on the stationary part of the guard. If the change in the position of the actuator reaches the maximum value
of the defined distance, the switching state is detected by the safety relay connected to the sensor and is
signaled to the control via two fail-safe OSSD contacts.
As a result, risky machine movements can only be executed while the guard is closed or if a stop command
is executed while the guard is being opened.
Moreover, additional switching elements can be integrated in the safety circuit. The monitoring of relays or
contactors is possible via their feedback contacts K3, K4 in the start circuit of the MSI-MC3x.
Due to the closed design of the sensors, they can also be used in critical environmental conditions (e.g.,
in areas where there is exposure to dust).
The system offers a high degree of safety and satisfies the following standards:
• Up to Performance Level (PL) e (EN ISO 13849-1:2015)
• Up to safety category 4 (EN ISO 13849-1:2015)
Depending on the application, various MC3x series are available.

Device description
Leuze electronic GmbH + Co. KG MC3x 12
1 Sensor
2 Actuator
3 Safety relay
Figure 3.1: MC3x series with MSI-MC3x
3.1 Device overview
Table 3.1: Overview of the product variants of the MC3x series with contact set 1NC/1NO
1
2
3
1
1
2
2
Sensor Housing Switching distance
Sao /OFF/ Sar
Connection
MC388-S1x Cuboid
Max. 88 mm x 25 mm
< 6 mm, > 13 mm, > 30 mm 2 m, 5 m, 10 m PVC con-
nection cable with wire-end
sleeves
2 m, 5 m, 10 m PUR con-
nection cable with wire-end
sleeves
0.2 m PVC connection
cable with M12 connector
M8 connector

Device description
Leuze electronic GmbH + Co. KG MC3x 13
Table 3.2: Overview of the product variants of the MC3x series with contact set 2NO
MC336-S1x Cuboid
Max. 36 mm x 26 mm
< 3 mm, > 8 mm, > 11 mm 2 m, 5 m, 10 m PVC con-
nection cable with wire-end
sleeves
2 m, 5 m, 10 m PUR con-
nection cable with wire-end
sleeves
0.2 m PVC connection
cable with M12 connector
M8 connector
MC330-S1x Cylinder
Max. 30 mm, round
< 6 mm, > 12 mm, > 14 mm 2 m, 5 m, 10 m PVC con-
nection cable with wire-end
sleeves
2 m, 5 m, 10 m PUR con-
nection cable with wire-end
sleeves
0.2 m PVC connection
cable with M12 connector
M8 connector
Sensor Housing Switching distance
Sao /OFF/ Sar
Connection
Sensor Housing Switching distance
Sao /OFF/ Sar
Connection
MC388-S2x Cuboid
Max. 88 mm x 25 mm
< 9 mm, > 19 mm, > 22 mm 2 m, 5 m, 10 m PVC con-
nection cable with wire-end
sleeves
0.2 m PVC connection cable
with M12 connector
M8 connector
MC336-S2x Cuboid
Max. 36 mm x 26 mm
< 7 mm, > 17 mm, > 20 mm 2 m, 5 m, 10 m PVC con-
nection cable with wire-end
sleeves
0.2 m PVC connection cable
with M12 connector
M8 connector
MC330-S2x Cylinder
Max. 30 mm, round
< 6 mm, > 15 mm, > 18 mm 2 m, 5 m, 10 m PVC con-
nection cable with wire-end
sleeves
0.2 m PVC connection cable
with M12 connector
M8 connector

Device description
Leuze electronic GmbH + Co. KG MC3x 14
Table 3.3: Overview of MSI-MC3x safety relays
1 Connection terminals
2 Voltage indicator
3 Status K1
4 Status K2
5 Connection terminals
Figure 3.5: MSI-MC310 and MSI-MC311 safety relay
Safety Relays Functions Output contacts Safety
MSI-MC310 Evaluation of MC3xS1x sen-
sors (1NC/1NO), RES, EDM
Safety-related relay con-
tacts 2 normally open con-
tacts (NO) / non-safety-
related relay
contact 1 normally closed
contact (NC)
Up to PL e and cat. 4
(EN 13849-1:2015) with
connection of one sensor
Up to PL e and cat. 3
(EN 13849-1:2015) with
connection of more than
one sensor
MSI-MC311 Evaluation of MC3xS2x sen-
sors (2NO), RES, EDM
Safety-related relay con-
tacts 2 normally open con-
tacts (NO)
Up to PL e and cat. 4
(EN 13849-1:2015) with
connection of one sensor
Up to PL e and cat. 3
(EN 13849-1:2015) with
connection of more than
one sensor
Figure 3.2: Design MC388x Figure 3.3: Design MC336x Figure 3.4: Design MC330x
24
S11
31
OUT
A2
A1
23
SR
13
A
S22 S33 S34
S12 32 14
MSI-MC310
Supply
K2
K1
1
2
3
4
5
1
2
3
4
5

Device description
Leuze electronic GmbH + Co. KG MC3x 15
1 Date of manufacture
2 Order number
3 Designation
Figure 3.6: Designation locations, MC3x series sensors
LED State Meaning
Supply Green illuminated Voltage supply switched on
K1 Green illuminated Input condition for K1 fulfilled
K2 Green illuminated Input condition for K2 fulfilled
123

Functions
Leuze electronic GmbH + Co. KG MC3x 16
4 Functions
Table 4.1: Overview of the safety functions
4.1 Start/restart interlock
(Connection of the reset button between pin OUT / 24 V and pin SR of the MSI-MC310)
(Connection of the reset button between pin A2 and pin SR1 / SR2 of the MSI-MC311)
The start/restart interlock prevents automatic release of the safety circuits and automatic start-up of the
system (e.g., if the protective door closes again or an interruption of the voltage supply is restored).
The system may not be manually released with the reset button until no persons are located in the danger
zone (see chapter 7.7 "Unlocking start/restart interlock").
4.2 Automatic start/restart
(Bridge between pin OUT / 24 V and pin A of the MSI-MC310)
(Bridge between pin SR1 / SR2 and pin EDM of the MSI-MC311)
The automatic start/restart interlock enables immediate release of the safety circuits and automatic start-
up of the system (e.g., if the safety door closes again or an interruption of the voltage supply is restored).
This operating mode is only permitted if it is not possible to reach or step behind the guard (see chapter 7.7
"Unlocking start/restart interlock").
4.3 Contactor monitoring (EDM)
(Connection in the start circuit between pin OUT and pin SR of the MSI-MC310)
(Connection in the start circuit between pin S12 and PIN EDM of the MSI-MC311)
The MSI-MC310 / MSI-MC311 monitors the feedback circuits of the connected relays or contactors.
The two OSSDs are not activated until:
• All actuators of the connected sensors are in the specified distance range
• All connected sensors are activated
• Opening of the contacts (reset button, EDM contacts) causes the signal at pin SR to drop out
Short description of the functions
Stop function Safety-related; initiated by the protective device
Start/restart interlock Prevents automatic restart; forces manual confirmation via a reset button
(RES)
Automatic start/restart Automatic operation without use of a reset button
RES (restart) Manual start by means of a reset button for guards that are accessible
from behind
EDM External Device Monitoring (contactor monitoring)
Display technology LEDs, display for K1, K2 input condition as well as for voltage supply
OSSDs Safety-related switching outputs (relays)

Applications
Leuze electronic GmbH + Co. KG MC3x 17
5 Applications
The MC3x series is used in position monitoring of moveable guards, e.g. (sliding) gates, flaps or hoods.
Figure 5.1: Access guarding on a PCB production line, implemented on a door with MC330x sensors
WARNING!
Unexpected machine start-up may cause severe injuries.
If the guard is accessible from behind, e.g., in the case of access guarding of danger zones, only
the opening of the door is detected; persons present within the danger zone are not detected
after the door is closed.
Only operate access guarding in the start/restart interlock operating mode or take additional
safety measures.

Applications
Leuze electronic GmbH + Co. KG MC3x 18
Figure 5.2: Access guarding on a filling system, realized on a door with MC388x sensors
Figure 5.3: Access safeguarding on a small painting robot, implemented on a hood with MC336x
sensors

Applications
Leuze electronic GmbH + Co. KG MC3x 19
Figure 5.4: Access safeguarding on a food production line, implemented on a sliding gate with MC336x
sensors
Figure 5.5: Access safeguarding on a beverage filling system, implemented on a raisable window with
MC336x sensors

Mounting
Leuze electronic GmbH + Co. KG MC3x 20
6 Mounting
6.1 Selecting the position and arrangement of sensor and actuator
Select the mounting locations so that the following conditions are satisfied acc. to EN 14119:
• For doors/flaps that swing open, the position of sensor and actuator is opposite the hinge side.
• The position of sensor and actuator allows the cut-out distance Sar to be reached upon opening of
the moveable guard.
• The position of sensor and actuator makes it impossible to reach or step behind the moveable guard.
• Make certain that the gap dimension between the fixed and moveable part of the guard is not wide
enough for reaching or stepping behind.
• The position of sensor and actuator makes it impossible for a person to reach the dangerous area
during the stopping time of the machine after the guard is opened.
• The position protects the sensor from physical shocks and vibrations that exceed specifications (see
chapter 13 "Technical data").
• Adjacent magnetically coded sensors must be separated by at least 50 mm.
• The position of sensor and actuator must not lie within the range of influence of blasting agents or
magnetic particles.
• Mounting on ferromagnetic materials (e.g., iron, nickel, cobalt) is to be avoided.
• When mounting on stainless steel surfaces, spacers are to be used and the safety-related switching
distances are to be inspected.
• The position of sensor and actuator must facilitate form-fitting mounting.
• Accessible to qualified personnel for testing and replacement.
• Cannot be manipulated by operators though removal, turning, short-circuiting (e.g., by means of cov-
ered mounting)
Aligning on the basis of the markings, approach directions
In the following example, the MC388x sensor is mounted on the front of a sliding gate. The switching condi-
tion is activated by the actuator approaching from below.
WARNING!
Improper mounting may result in serious injury!
The protective function of the sensors is only ensured if used in the intended area of application
and if they are mounted professionally.
Mounting may only be performed by competent persons.
Observe the relevant standards, regulations and these instructions.
Do not use the sensor in areas under the influence of strong magnetic fields.
After mounting, check the sensors for proper function
WARNING!
Improper mounting may result in serious injury!
The protective function of the sensors is only ensured if, after the guard is opened, the
dangerous process can be safely stopped before it is reached by a person.
Mount the sensors with an adequate safety distance to the danger zone.
Take all delay times into account (e.g., the response times of the control elements, the stopping
time of the machine)
NOTE
Faulty or incorrect alignment will result in an operating fault.
The alignment of sensor and actuator within the scope of start-up is to be performed only by
trained personnel.
Observe the data sheets and mounting instructions of the individual components.