Zander Aachen SCB Series User manual

Safety Time Control Device SCB
Operating Instruction
SCB

H. ZANDER GmbH & Co. KG • Am Gut Wolf 15 • 52070 Aache • Deutschla d • Tel +49 241 9105010
Fax +49 241 91050138 • i fo@za der-aache .de • www.za der-aache .de
2
Safety Time Control Device SCB
H. Zander GmbH & Co. KG
Am Gut Wolf 15
52070 Aachen, Germany
www.zander-aachen.de
Number: E61-049-00
Version: M01
Engl. Translation of the original
document
Subject to technical modifications,
no responsibility is accepted for
the accuracy of this information.

H. ZANDER GmbH & Co. KG • Am Gut Wolf 15 • 52070 Aache • Deutschla d • Tel +49 241 9105010
Fax +49 241 91050138 • i fo@za der-aache .de • www.za der-aache .de
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Safety Time Control Device
Contents
1. Scope 5
2. Target group 5
3. Safety instructions 5
4. Appropriate use 6
5. Disclaimer and warranty 7
6. Features 8
7. Functions 9
7.1 Functions of the safety circuit I21-I11 and I22-I12 9
7.2 Functions of the reset circuit X1 9
7.3 Functions of the feedback loop Y1 9
7.4 Functions of the safe semiconductor output P1 and O2 10
7.5 Functions of the safe relay contact 17-18 and 27-28 10
7.6 Functions of the auxiliary outputs C1 and C2 10
7.7 Functions of the delay time 10
8. Application example 11
8.1 Functions of the safety circuit I21-I11 and I22-I12 11
8.2 Functions of the reset circuit X1 12
9. Mounting 14
10. Electrical connection 15
11. Checks, maintenance and Proof-Test 16
11.1 Checks and maintenance 16
11.2 Proof-Test 16
12. Wiring 17
12.1 Wiring reset circuit 17
12.2 Wiring feedback circuit 17
12.3 Wiring safety circuit 17
12.4 Wiring supply voltage 18
12.5 Wiring safe relay contacts and safe semiconductor oututs 18
12.6 Wiring auxiliary outputs 18

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Safety Time Control Device SCB
13. Configuration of the SCB 19
13.1 Loading a configuration 19
13.2 Parametrization of a delay time 21
14. Commissioning procedure 23
15. Diagnostic functions 24
15.1 Operating state wir Off-delay outputs/contacts 24
15.2 Operating state wir On-delay outputs/contacts 25
15.3 Configuration display 26
15.4 Error monitoring 27
16. Configurations tables 28
16.1 Configuration table for variants SCB-04, SCB-04m, SCB-04h 28
16.2 Configuration table for variants SCB-04-01, SCB-04m-01, SCB-04h-01 29
16.3 Configuration table for variants SCB-03, SCB-03m, SCB-03h 29
16.4 Configuration table for variants SCB-03-01, SCB-03m-01, SCB-03h-01 29
16.5 Configuration table for variants SCB-02, SCB-02m, SCB-02h 29
16.6 Configuration table for variants SCB-02-01, SCB-02m-01, SCB-02h-01 30
17. Timing diagrams 31
17.1 Timing diagram SCB-04 with Configuration Pr04 31
17.2 Timing diagram SCB-04 with Configuration Pr19 32
17.3 Timing diagram SCB-04-01 with Configuration Pr24 33
17.4 Timing diagram SCB-04-01 with Configuration Pr27 34
18. Dimensions 35
19. Safety parameters 36
20. Technical data 37
21. Derating 39
22. Variants 40
23. Declaration of Conformity 40

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Safety Time Control Device
1. Scope
This document is valid for:
2. Target group
Specialist electricians and assembly, setup and service specialists who possess special
knowledge in working with safety components.
3. Safety instructions
Safety components are intended to protect people. Not following the safety in-
structions, improper installation or manipulation may result in fatal injuries to
persons and damage to property. Safety devices must not be bypassed, remo-
ved or manipulated in any way. Please follow all the safety instructions and war-
nings mentioned in this document.
Type Order-No.
Plug-in screw terminals
Order-No.
Plug-in spring-cage terminals
SCB-04 474460 475460
SCB-03 474480 475480
SCB-02 474490 475490
SCB-04m 474461 475461
SCB-03m 474481 475481
SCB-02m 474491 475491
SCB-04h 474462 475462
SCB-03h 474482 475482
SCB-02h 474492 475492
SCB-04-01 474465 475465
SCB-03-01 474485 475485
SCB-02-01 474495 475495
SCB-04m-01 474466 475466
SCB-03m-01 474486 475486
SCB-02m-01 474496 475496
SCB-04h-01 474467 475467
SCB-03h-01 474487 475487
SCB-02h-01 474497 475497

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Safety Time Control Device SCB
• Installation, commissioning, maintenance, and decommissioning should be done only by
authorised and qualified technicians:
− who are familiar with proper handling of the safety components
− who are familiar with the applicable EMC and ESD regulations
− who are familiar with the local regulations concerning work safety and accident
prevention
− who have read and understood these operating instructions.
• Opening the device, any kind of manipulation to it and bypassing the safety devices are
not permitted
• The electrical connection of the device must take place only when the voltage supply is
switched off
• Loads at the outputs must be disconnected from the device during device configuration
• The wiring of the device must be according to the instructions of this user information,
otherwise there is a risk that the safety function will be lost
• The current paths 17-18 and 27-28 must carry only the same voltage potentials
• The device version (see nameplate "Ver.") should be stored and checked before every
commissioning. When there is a version change, the use of the device in the overall
application should be revalidated
4. Appropriate use
The SCB is a universally applicable safety time control device, with which the moving
parts of a machine or plant can be brought to a standstill quickly and safely in case of dan-
ger. Depending upon the configuration, the safety outputs connect on-delay, off-delay or
without delay independent of one another.
The approved operating parameters for use must be complied (see "Technical data").
A risk assessment should be carried out on the machine before using the device. For
example, according to:
EN ISO 13849-1, Safety-related parts of control systems, Appendix A
EN ISO 12100, Safety of machinery - General principals for design - Risk assessment and
risk reduction
IEC 62061, Safety of machinery - Functional safety of safety-related electrical, electronic
and programmable electronic control systems.
Additional requirements may have to be considered depending on the type of machine or
plant.

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Safety Time Control Device
Appropriate use also includes compliance with:
EN ISO 13849-1, Safety-related parts of controllers,
EN 60204-1, Electrical equipment in machines.
For further information please refer to the above mentioned documents.
ATTENTION!
The user is responsible for integrating the device into a safe overall system. For this pur-
pose, the overall system has to be validated, e.g. according to EN ISO 13849-2.
If a operating instruction is enclosed with the product, then the specifications given in the
operating instruction are applicable
5. Disclaimer and warranty
If the above mentioned conditions for appropriate use are not complied with or if the safety
instructions are not followed or if any maintenance operations are not carried out as requi-
red, this shall lead to an exclusion of liability and loss of warranty.
ATTENTION!
We would like to point out that it is the full responsibility of the operator to ensure a plant
availability.
Using the SCB, a safety emergency stop relay according to
• EN ISO 13849-1
• IEC 62061
• IEC 61508
• EN 50156-1
• EN 746-2
• IEC 61511-1
is used, which will be brought into the safe state when the safety function is requested.

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Safety Time Control Device SCB
This means that the connected load is switched off as soon as a request from connected
sensor elements or diagnostic measures detects a dangerous state, e.g. caused by a
component fault.
Since process-related applications in particular have high demands on availability, limited
availability can also have significant consequences.
It is therefore recommended to stock a second unit to avoid long downtimes in such a
case.
These are recommendations of the manufacturer, the evaluation of the importance of the
plant availability is the sole responsibility of the operator.
6. Features
• Depending on variant:
− 2 safety semiconductor outputs and 2 safety relay contacts (SCB-04)
− 2 safety relay contacts (SCB-02)
− 3 safety semiconductor outputs (SCB-03)
• Switching behaviour configurable on the device
• 2 semiconductor auxiliary outputs
• Adjustable switch-on / switch-off delaytime
− Depending on variant: 0 to 99 s; 0 to 99 min; 0 to 99 h (Resolution ≥0.1 s/min/h)
• Connection of:
− Potential-free NC contacts
− PNP-Semiconductor outputs
− OSSD outputs
• Single or dual-channel operation possible
• Simple, fast and accurate delaytime adjustment via push/rotary button and display
• Indication of all switching states via LED
• Automatic or monitored, manual reset
• For safety applications up to PL e, Cat. 4, SIL 3
• For furnaces in continous operatin according to EN 50156-1 and EN 746-2
• EN ISO 13849-1; IEC 62061; IEC 61508; IEC 61511; EN 50156-1; EN 746-2

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Safety Time Control Device
7. Functions
The safety time control device SCB is conceptualised for the safe isolation of safety circu-
its according to EN 60204-1 and can be used in safety applications up to, PL e, Cat. 4,
SIL 3 as well as on furnaces in continuous operation according to EN 50156-1 and EN
746-2. Figure1 shows the block diagram of the SCB.
Figure1: Block diagram SCB
7.1 Functions of the safety circuit I21-I11 and I22-I12
Depending on the wiring, the input circuits I21-I11 and I22-I12 are used for two-channel or
single-channel control and thus monitoring of connected sensors.
7.2 Functions of the reset circuit X1
The reset behaviour of the SCB is determined via terminal X1 in combination with the se-
lected configuration. Automatic and monitored manual reset are available.
7.3 Functions of the feedback circuit Y1
If contactors or expansion modules are controlled via the SCB, they can be monitored via
a feedback circuit to terminal Y1. This prevents a restart in the event of a contactor failing
in a dangerous state.
Y1

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Safety Time Control Device SCB
7.4 Functions of the safe semiconductor outputs O1 and O2
Taking into account the selected configuration, the safe PNP semiconductor outputs
switch on when the safety circuit is closed. Opening the safety circuit leads to a switch-off.
7.5 Functions of the safe relay contacts 17-28 and 27-28
Taking into account the selected configuration, the safe relay contacts switch on when the
safety circuit is closed. Opening the safety circuit leads to a switch-off.
7.6 Functions of the auxiliary outputs C1 and C2
Two semiconductor outputs C1 and C2 are available for signalling different states. The
switching behaviour is determined by the selected configuration.
7.7 Functions of the delay time
Depending on the configuration, the safe output/contacts can switch on or off time delayed
to the safety circuit. The following time functions can be configured:
• Switch-On delay
The safe outputs/contact will switch-on time delayed if the safety circuit ist getting clo-
sed and a proper reset signal occurs. Opening the safety circuit leads to an immediate
switch-off of the safe outputs/contacts.
• Switch-Off delay
The safe outputs/contact will switch-on immediate if the safety circuit ist getting closed
and a proper reset signal occurs. Opening the safety circuit leads to time delayed
switch-off of the safe outputs/contacts.
• Switch-Off delay with automatic Re-Trigger function
In the event of a switch-off delay with automatic re-trigger function, the safe outputs/
contacts switch on immediately by closing the safety circuit and a monitored, manual
reset command. If the safety circuit is opened, the outputs/contacts are switched off
immediately or with a time delay according to the selected configuration.
If the safety circuit is closed again before the countdown of the parametriced delay
time is ended, the outputs/contacts that have already been switched off are automati-
cally activated again. For the still activated outputs/contacts, the countdown of the de-
lay time is stopped and reset for the next request.

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Safety Time Control Device
ATTENTION
If the function switch-off delay with automatic re-trigger function is used, the automatic
reset at the moment of re-triggering has to be considered separately, since the monito-
red, manual start is disabled in this moment.
8. Application example
8.1 Filtering exceedings of set limit values with automatic re-trigger function
Short-term, process-related exceeding of set limit values cannot be completely excluded,
and should not necessarily lead to the immediate shutdown of a system.
Because this might lead to unnecessary standstills with a high personnel expenditure re-
garding resetting.
By filtering these signals with an SCB, the availability of a system can be maintained
without safety loss. Figure 2 shows a suitable application example with an SCB-02.
Figure 2: SCB-02 for filtering short-term triggering of a pressure switch

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Safety Time Control Device SCB
With the selected configuration Pr06, which allows a monitored, manual start with automa-
tic re-trigger function as well as a time-delayed switch-off of the safe relay contacts, the
SCB-02 filters a short-time triggering of the connected pressure-switch up to 10 seconds.
If an overpressure is detected, the time delay at the SCB-02 is triggered. This means that
the safe relay contacts remain closed for a period of 10 seconds.
If the pressure falls below the limit value again within this time an automatic re-triggering
of the SCB-02 takes place. This means that the running time delay is stopped and the
relay contacts remain energized.
However, if an overpressure persists after the 10 seconds, the SCB-02 switches off its
safe relay contacts. A restart is only possible again after acknowledgement via the reset-
button.
8.2 Time delayed reset
Accidental resetting of a safety system can lead to a hazard if a person is in the danger
zone at this time.
By using an SCB-04 with configuration Pr27 ("delayed reset") in combination with a safety
relay (e.g. SR3C) this can be prevented.
For this, two reset buttons are used to release a machine located in the danger zone. In
combination with the SCB-04 and two safety relays, the safety guard door, the sequence
as well as the time window for actuating the reset buttons are monitored (see Figure 3 and
Figure 4).
Reset button 1 is mounted in the danger area and reset button 2 in the safe area. Both in
such a way that the operating personnel have a clear overview of the danger area.
By pressing the RESET1 button, the safety circuit for the safety relay K2 is enabled for the
parameterised time window of 20 seconds. This is completely closed as soon as the ope-
rator leaves the danger zone through the safety door and closes it.
Now the machine can be released within the remaining time via the RESET 2 button. By
guiding the safety circuit of K2 via its own relay contacts, K2 remains in self-retaining
mode after release via RESET 2.
If the time running on the SCB-04 has elapsed before pressing the RESET 2 button, the
safety circuit of K2 is blocked again and disconnection of the machine is prevented.
Without actuating the RESET 1 button in the danger area, the machine cannot be re-
leased even with the safety door closed.
An accidental start of the machine without the knowledge of a person in the danger area is
thus safely prevented.

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Safety Time Control Device
Figure 3: Application example - Time delay reset with two reset buttons
Figure 4: Wiring example füfor application example - Time delayed reset

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Safety Time Control Device SCB
9. Mounting
The device has to be installed in a cabinet having minimum protection class of IP54:
• Mount on a 35 mm mounting rail as per EN 60715
• For optimum heat dissipation, mount with ventilation slots facing upwards
• Ensure adequate heat dissipation in the cabinet
• Mounting distance to neighbouring devices to be maintained is 10 mm
Figure 5: Mounting / Demounting

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Safety Time Control Device
10. Electrical connection
• Wiring only be carried out while the voltage supply is switched off
• Do not connect any external voltages to the outputs O1, O2, C1 and C2
• The outputs O1, O“, C1 and C2 are short-circuit-proofed. Overloading is not allowed and
results in damage to the device (see „Technical data“)
• Auxiliary outputs C1, C2 may not be used as safety outputs
• A safety transformer according to EN 61558-2-6 or a power supply unit with galvanic
isolation should be connected upstream of the mains
• An external fuse for the relay contacts (6 A gG) must be provided
• Inductive loads at the outputs and contacts must have sufficient protective circuitry, e.g.
a free-wheeling diode
ATTENTION!
If automatic reset is configured, the SCB is immediately activated when the safety circuit is
closed.
The monitored manual reset of the device should not be used to start the machine in
accordance with EN ISO 13849-1.
Figure 6: Front view of the SCB - Terminal explanation (for the SCB-04)
A1: Power supply (DC 24 V)
A2 : Power supply (0V)
I11/I21: Safety circuit channel 1
I12/I22: Safety circuit channel 2
X1: Automatic or manual reset
Y1: Feedback circuit
17-18/27-28: Safety relay contacts
O1/O2: Safety semiconductor outputs
C1: Auxiliary output 1
C2: Auxiliary output 2

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Safety Time Control Device SCB
11. Checks, maintenance and Proof-Test
11.1 Checks and maintenance
The following checks are regularly required to ensure proper and continuous functioning:
• Check the switching function
• Check for signs of manipulation and safety function bypassing
• Check if the device is mounted and connected securely
• Check for soiling
Check if the safe function of the whole safety system is working properly, in particular:
• Every time after initial commissioning
• Every time after replacing a component
• After a long downtime
• After every fault
Regardless of this, the safe functioning of the safety device should be checked at suitable
intervals, e.g. as part of the maintenance schedule of the plant. No maintenance is requi-
red for the device itself.
11.2 Proof-Test
To check the correct function of the device within the framework of a proof test, the follo-
wing steps must be carried out:
Demand the safety function by opening the safety circuit. Check that the safe relay con-
tact 17-18/27-28 and safe semiconductor outputs O1 and O2 are switched off. Check for
correct delay time, too.
Close the safety circuit and start the device again. Ceck that the safe relay contacts
17-18/27-28 and safe semiconductor outputs O1 and O2 are switched on. Check for cor-
rect delay time, too.
If the device doesn‘t switch on again, the proof-test failed.
ATTENTION!
If the proof test was not passed or if the device was damaged, e.g. after an error, faultless
operation can no longer be guaranteed. In this case, replace the device. Repairs on the
device as well as the opening of the housing may only be carried out by the manufacturer.

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Safety Time Control Device
12. Wiring
Depending on application or result of the risk assessment, e.g. according to
EN ISO 13849-1, the device should be wired according to Figure 7 to 17.
12.1 Wiring reset circuit
12.2 Wiring feedback circuit
12.3 Wiring safety circuit
Figure 7:
Automatic reset
Caution:
Safety contacts switch
on immediately in the
operating state.
Figure 9:
Feedback circuit.
Monitoring of externally
connected contactors or
expansion modules. If the
feedback circuit is not used,
the contact Y1 should be
wired to DC 24 V.
Figure 8:
Monitored manual
reset. The reset re-
lease is triggered by a
falling edge at X1, with
which a complete
switching operation of
the reset button is
monitored.
Figure 12:
Single-channel emer-
gency stop circuit with
earth contact monito-
ring.
For safety applications
up to PL c, Cat. 1,
SIL 1.
Figure 13:
Dual-channel sliding
guard monitoring with
cross circuit and earth
contact monitoring.
For safety applications
up to PL e, Cat. 4,
SIL 3.
Figure 10:
Dual-channel emer-
gency stop circuit with
cross circuit and earth
contact monitoring.
For safety applications
up to PL e, Cat. 4,
SIL 3.
Figure 11:
Dual-channel emer-
gency stop circuit with
earth contact monito-
ring.
For safety applications
up to PL d, Cat. 3,
SIL 2

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Safety Time Control Device SCB
12.4 Wiring supply voltage
12.5 Wiring safe relay contacts and safe semiconductor outputs
12.6 Wiring auxiliary outputs
Figure14:
Dual-channel emer-
gency stop circuit with
PNP semiconductor
outputs / OSSD out-
puts with seüerate
cross circuit detection.
For safety applications
up to PL e, Cat. 4,
SIL 3.
Figure 15:
Connection of the power
supply to the terminals A1 and
A2.
Figure 16:
Connection to switching loads at
safety contacts (Exemplary contact
configuration. Differing according
to device type. Switching voltage
"L" according to tech. data).
Inductive loads at the outputs and
contacts must have sufficient
protective circuitry, e.g. a free-
wheeling diode.
Figure 17:
Wiring auxiliary outputs C1
and C2.

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Safety Time Control Device
13. Configuration of the SCB
The SCB is delivered with the default configuration "Pr00". With this configuration, the
device evaluates the safety circuit and the reset circuit according to the configuration
table. However, no delay time is executed. A parameterization of the delay time is therefo-
re not possible.
Carry out the following steps when commissioning the device for the first time.
Table 1 explains the symbols used for this purpose.
Table 1: Symbol explanations
13.1 Loading a configuration
Determine the desired configuration number using the configuration table shown in Chap-
ter 16. By entering a PUK (Parametrization Unblocking Key) you reach the configuration
selection (PUK for loading a configuration: 6- 1).
To do this, switch on the supply voltage while pressing the push/rotory button at the same
time. A running light as well as the following display "Pu" informs about the menu item
PUK (see Figure 18).
Figure 18: Display during entry into menu item PUK
Power-
On
+
7 s
Y1 Y1 Y1
Symbol Description
Press the push/rotary button for minimum 2 seconds.
Press push/rotary button briefly
Turn push/rotary button
Wait for 2 seconds
Enter (2s)
Enter
2 s

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Safety Time Control Device SCB
After the menu item "Pu" has been displayed for approx. 2 seconds, the PUK can be ente-
red (see Figure 19).
Figure 19: PUK procedure
1. bis 3. PUK enty:
first digit of the PUK is set by turning the push/rotary button. The first PUK digit is saved
by pressing the button briefly and the second PUK digit can be set in the same way as the
first one. The PUK Entry is ended by pressing the button briefly. To select the configurati-
on of the SCB, enter the following PUK: 6- 1
In case of wrong PUK entry, an error indication „Er17“ appears. The error should be
acknowledged by pressing the button for 2 s.
After acknowledgement, it will go back to step 1. The entry can be made again.
TIP: To abort the PUK entry, disconnect the supply voltage of the device. On reset the
SCB starts with the previously parametrized delay time and configuration.
4. to 7. Select and load configuration
After successful PUK entry, the access to the configuration selection is signalled by the
indication „Pr“. The desired configuration can now be loaded by turning the push/rotary
button. After selection of the desired configuration, it is confirmed by pressing the button
for 2 seconds. The SCB loads the new configuration and restarts.
INFO: A new configuration is always loaded with a preset delay time of 0.0 s/min/h.
1. 3. 4. 5.
2.
2 s Enter Enter 7 s
7.
6.
2 s Enter (2s)
Y1 Y1 Y1 Y1 Y1 Y1 Y1
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