Pepperl+Fuchs SC4-2 User manual

FACTORY AUTOMATION
CONTROL UNIT SC4-2
INSTRUCTION MANUAL
INSTRUCTION MANUAL

With regard to the supply of products, the current issue of the following document is applicable: The General
Terms of Delivery for Products and Services of the Electrical Industry,
published by the Central Association of the Electrical Industry (Zentralverband Elektrotechnik und Elektroin-
dustrie (ZVEI) e.V.)
in its most recent version as well as the supplementary clause: "Expanded reservation of proprietorship"

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Control unit SC4-2
1 SC4 control system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 Intended use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 Product description and features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 The SC4-2 control unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Working principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4 SC4-2 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.5 SC4-2 displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Start/restart interlock (Restart) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2 Relay monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5 Setup and assembly of the light barriers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.1 SLA light barriers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.2 Message outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.3 Safety outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

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Control unit SC4-2
7 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
7.1 Adjust protective beams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.2 Layout with adjustable mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.3 Verifying functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.3.1 Test of detection capability of the installed electrosensitve protection device. . . . . . . . . . . . . . . . . . 27
7.3.2 Test of start/restart interlock and startup enable (restart/start) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.3.3 Testing the test/reset connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.3.4 Test of relay monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.3.5 Principle of operation of the OSSD outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8 Periodic checkup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
9 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
10 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
10.1 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
10.2 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
10.3 Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
10.4 Ordering information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
11 Sample circuits for SC4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
12 Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
13 Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
13.1 Construction and equipping of protective equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
13.2 Use and installation of protective equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
14 Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

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Control unit SC4-2
Please note!
These operatcontroling instructions contain information on the intended use of the product and serve to pro-
tect users from danger. They must be read and observed by all persons who implement, use, care for,
maintain and monitor this product. This product can only fulfill the tasks for which it is intended if it is used,
cared for, maintained and monitored in accordance with the instructions of Pepperl+Fuchs.
The warrantee undertaken by Pepperl+Fuchs for this product becomes null and void if it is not used, cared
for, maintained and monitored in accordance with the instructions of Pepperl+Fuchs.
Before selecting and using the product, an evaluation must be performed to determine whether it is suitable
for the purpose in question. The selection and range of application are not subject to the influence of Pep-
perl+Fuchs. Our liability is therefore limited to consistent quality of the product.
The product must be regularly monitored and maintained by professionals. The results of inspections and
maintenance tasks must be kept in logs. Only original Pepperl+Fuchs parts must be used for repair jobs.
Changes to the devices or components and the use of defective or incomplete devices or components are
not permitted. Repairs to devices or components may only be performed by Pepperl+Fuchs or authorized
work shops. These work shops are responsible for acquiring the latest technical information about Pep-
perl+Fuchs devices and components.
Repair tasks made on the product that are not performed by Pepperl+Fuchs are not subject to influence on
the part of Pepperl+Fuchs.
Our liability is thus limited to repair tasks that are performed by Pepperl+Fuchs.

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Control unit SC4-2
The preceding information does not change information regarding warrantee and liability in the terms and
conditions of sale and delivery of Pepperl+Fuchs.
This device contains sub-assemblies that are electrostatically sensitive. Only qualified specialists may open
the device to perform maintenance and repair tasks. Touching the components without protection involves
the risk of dangerous electrostatic discharge, and must be avoided. Destruction of basic components caused
by an electrostatic discharge voids the warrantee!
Symbols used
This manual uses symbols to present important information on operating the SC4-2 and working safely with
it. The meaning of these symbols is as follows:
Subject to technical modifications.
Recommendation for the user
Observing these notes will make it easier to place the system in operation and to work with the
SC4-2.
Refers to a hazard or an immediate danger.
Failure to observe such instructions may result in damage to property, serious injury or death.

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Control unit SC4-2
14 SC4 control system
14.1 Intended use
In combination with light barriers of type SLA, the SC4 control system represents a photoelectric protective
device. Protective beams are formed between transmitters and receivers.
Applicable safety rules, standards and requirements must be observed during usage, and the specific requi-
rements in the application in question must be taken into consideration.
14.2 Product description and features
The SC4 analysis system is an electrosensitive protection device of Type 4 (EN IEC 61496-1)or
Category 4 (EN 954-1).
System features:
- Selectable start/restart interlock (restart interlock RI)
- Selectable relay monitor (RM)
- Red transmitter light for easy adjustment of light barriers
-Functionreservedisplay on each receiver
- 7-segment display to make it easy to pinpoint errors
This system must only be used in accordance with intended purpose as electrosensitive pro-
tection device for securing access to hazardous points and areas. Any use not in accordance
with these conditions does not comply with usage in accordance with the intended purpose.

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Control unit SC4-2
15 Declaration of conformity
This product was developed and manufactured under observance of the applicable European standards and
guidelines.
The product manufacturer, Pepperl+Fuchs GmbH, D-68307 Mannheim, has a certified quality assurance
system that conforms to ISO 9001.
Note!
A Declaration of Conformity can be requested from the manufacturer.
Note!
See technical data for applied harmonized standards.
ISO9001

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Control unit SC4-2
16 The SC4-2 control unit
16.1 Product description
With its light barriers of Type SLA, the SC4-2 control unit represents a one or two-beam photoelectric protec-
tive device. It consists of 2 modules,
- the OSSD Module with a 2-channel relay output (OSSD) and
- the light barrier module.
16.2 Working principle
Two protective beams are generated by the two light barriers that can be connected to the light barrier mo-
dule. Depending on the type of light barriers, the detection range of the protective beams may be 10 m, 30 m
or 65 m. Interruptions in a light beam are determined by the light barrier module. The OSSDs and the OSSD
message output in the OSSD Module are turned off. Downstream equipment in the machine control system
responds by turning off the dangerous motion.
A safety-related microprocessor control system permanently monitors the functionality of the light barriers
and the internal safety system. This ensures that errors are detected within the defined response time of the
system and that they result in the OSSDs being turned off.
If an error is detected by the test, the OSSDs remain in the Off state. In addition, a flashing signal is generated
on the "Readiness for startup" output (flashes at a rate of once per second) and the 7-segment display on the
SC4-2 displays the error that was detected.
The startup / restart lock and monitoring of EDM feedback (relay monitor) can be turned on or off as required
with switches on the SC4-2.
If the start/restart interlock is activated on the control unit, the "Restart" (Start) output is turned on if the light
beams are free.

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Control unit SC4-2
After the operating mode is changed or after an error is eliminated, a reset must be performed by briefly
turning off the operating voltage.
16.3 Layout
An electrosensitive protection device of the type des-
cribed here consists of:
- An SC4-2 control unit (light barrier module, OSSD
module)
- One or two light barriers of Type SLAxx
- (Optionally) a power pack (for power supply with al-
ternating current)
The SC4-2 is housed in a case suitable for mounting
on a top hat section rail. The installation width is
45 mm.
The following operating modes can be set as desired
with DIP switches that are accessible after the case is
opened
- Start/restart interlock (restart interlock RI)
- Relay monitor (RM)
(located in the light barrier module).
Figure 16.1: SC4-2 control unit
Light-barrier module
SD-module
R1
R2
ON
OFF
START
SC4-2
   
           
      
       

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Control unit SC4-2
Figure 16.2: Principle of operation of the SC4-2
Safety core
Emitter 1 Receiver 1
Light barriers
control
Restart
24 V DC
Restart
(RI) Relay monitor (RM)
Indicators
Signal outputs
OSSD-
control
Power supply
Emitter 2 Receiver 2
Test Test generation
SC4-2

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Control unit SC4-2
16.4 SC4-2 connections
Terminals are used to connect the light barriers, inputs and outputs and the voltage supply. Four terminals
are combined to form each terminal block. These terminal blocks can be disconnected, thus making it easy
to switch devices.
A light barrier channel that is not in use is jumpered (see section 19.1)
Terminal Assignment Function
1pnpoutputreadinessfor
startup message
Option for connecting external indicator lamps to indicate restart (start) or error message
(see section 17.1)
2 PNP output OSSD reporting
OFF
Option for connecting external indicator lamps to indicate the OSSD state Off
3 PNP output OSSD reporting
ON
Option for connecting external indicator lamps to indicate the OSSD state On
4 0 V internal Reference point for pnp outputs
5 Startup enable for input (RI) Normally open contact for start/restart interlock. It should be wired in if no function is activa-
ted (see section 17.1)
624Vinternal
7 Relay monitor input (RM) Relay monitor input. It should be wired in if no function is activated (see section 17.2)
824Vinternal
9 24 V DC Supply voltage connection, protected from reverse polarity
10 0 V
11 24 V internal Normally open contact for testing or error enable
12 Test input
Table 16.1: Connections of the SC4-2 OSSD module

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Control unit SC4-2
13 OSSD1.1 OSSD relay output 1 NO (normally open)
14 OSSD1.2
15 OSSD2.1 OSSD relay output 2 NO
16 OSSD2.2
Terminal Assignment Function
25 LS2-T Transmitter 2 connection
26 LS2-T 0V
27 LS2-R 0V Receiver 2 connection
28 LS2-R
29 LS1-T Transmitter 1 connection
30 LS1-T 0V
31 LS1-R 0V Receiver 1 connection
32 LS1-R
Table 16.2: SC4-2 connections for light barrier module
Terminal Assignment Function
Table 16.1: Connections of the SC4-2 OSSD module

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Control unit SC4-2
Table 16.3: Connection assignment of light barriers
SC4-2 light barrier module Receiver Transmitter
Conductor Pin Conductor Pin
LS2-T transmitter 25 BK (black) 4
26 BU (blue) 3
LS2-R receiver 27 BU (blue) 3
28 BN (brown) 1
LS1-T transmitter 29 BK (black) 4
30 BU (blue) 3
LS1-R receiver 31 BU (blue) 3
32 BN (brown) 1

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Control unit SC4-2
Figure 16.3: SC4-2 connections
ready to restart (yellow)
OFF (red)
ON (green)
0 V
+ 24 V DC
Restart 1
OSSD OFF 2
OSSD ON 3
0 V 4
13
14
15
16
Test +U 11
Test 12
Restart 5
Restart +U 6
RM 7
RM +U 8
Supply 24V 9
Supply 0 V 10
K1
F1
F2
K1K K2K
Restart
Test/Reset
Indicator
Output
OSSD
Input
Sensor
25 LS2-T
26 LS2-T 0 V
27 LS2-R 0 V
28 LS2-R
29 LS1-T
30 LS1-T 0 V
31 LS1-R 0 V
32 LS1-R
K2

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Control unit SC4-2
16.5 SC4-2 displays
Displays for the switching state of the OSSD and status displays for indicating the operating status are loca-
ted on the front plate of the two modules of the SC4-2.
.
Display LED Meaning
OFF Red OSSD output turned off
ON Green OSSD output turned on
Start Yellow Continuous light:Protective field free, OSSD off, readiness for
startup,
activate restart button
Flashing System error (see Status E1, E2)
R1 Yellow Status of light barrier 1
Off: Interrupted
On: Light beam free
Flashing: Light beam free, level below function reserve:
R2 Yellow Status of light barrier 2
Off: Interrupted
On: Light beam free
Flashing: Light beam free, level below function reserve
Table 16.4: Status displays
yellow
7-segment
display
       
        
ON
OFF
START
R1
R2
SC4-2
   
           

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Control unit SC4-2
If an error is present, the yellow LED flashes, indicating readiness for startup. The 7-segment display shows
the error that has been detected (Table 16.5).
17 Operating modes
The operating modes of the SC4 can be adjusted using DIP switches. Two switches must be activated to set
an operating mode. The DIP switches are located inside the housing of the light barrier module.
To activate the DIP switches, pull out the right sub-assembly. To do this, press on the upper and lower un-
locking mechanism with a screwdriver. The sub-assembly can be pulled out as far as the holding mechanism
and the DIP switches are then accessible.
After the operating mode is changed, a reset should be triggered by turning off the operating voltage briefly.
You should note on the manufacturer's rating plate (Figure 17.2) with indelible ink which operating mode was
selected. The operating mode that is set should be monitored by an appropriate check (see section 20.3).
Display Meaning Display Meaning
Protective beams free, OSSD ON (running light) Error on one of the transmitters
One or both protective beams interrupted Extraneous light detected
Protective beams free, OSSD off, readiness for startup Sensor error in Channel 1
System start Sensor error in Channel 2
DIP switch position incorrect System errors
Both light barrier channels jumpered Error in an external relay
Table 16.5: 7-segment display

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Control unit SC4-2
When the control unit is delivered, the relay monitor (RM) is turned off and start/restart interlock (RI) is turned
on.
Figure 17.1: Position of the DIP switches Opening of the housing
DIP switches
1234
Start/restart interlock (RI) X X
Relay monitor (RM) X X
Table 17.1: Function of the DIP switches
ON
1234

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Control unit SC4-2
Figure 17.2: Adhesive label for marking the operating mode
17.1 Start/restart interlock (Restart)
If the protective beams are free and the start/restart interlock operating mode is activated, do not turn
the OSSDs and the OSSD-ON message on. The "Restart“ output is activated and the corresponding yellow
display LED lights up. After the "Restart“ (Start) button is pressed, the OSSDs and OSSD-ON message turn
on and the "Readiness for startup" output is turned off.
17.2 Relay monitor
With the OSSD switch outputs, the SC4 is able to perform safety-related monitoring of time-correlated exter-
nal switching elements with the aid of feedback contacts. Normally closed contact of force-guided relays
should be used as feedback contacts. The feedback contacts of all downstream external switching elements
should be wired in series. Series switching should be connected on the first side with the positive voltage
supply (Terminal 8) and on the other side with Terminal 7.
The feedback contacts of the external switching elements must ensure a reliable contact at a voltage of 20
V and a current of 6 mA. Resistance to peak voltages of 6 kV must be guaranteed between the feedback con-
tacts and other contacts that are at low voltage in accordance with the low voltage directive.
Operating Mode:
RI
RM
X

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Control unit SC4-2
Figure 17.3: Sample connection of relay monitor
The work circuit of the external switching elements must be protected by a fuse with a nominal
value of maximum 60 % of the load capacity of the contacts to prevent the contacts from
fusing. The external switching elements are monitored with a delay of 180 ms following the
switching process. If the new switching state is not assumed by the time the monitoring period
expires (180 ms), the SC4 switches into interlock state and the 7-segment display shows an F
This error should be acknowledged after the cause is eliminated by a reset on SC4.
13 14 15 16 7 8
SC4
K1
K1K K2K