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4.3 Increase of number and load capacity of contacts
If necessary the number and the load capacity of output contacts can be increased by
using external contactors with forcibly guided contacts
Feedback circuit for external contactors
with automatic start
L /+
K4 K5
F F F
K3 K6
S33
S34 13 23 33
14 24 34
K3 K4 K5
N /-
5 INTERNAL WIRING DIAGRAM
L / +
A1 S11 S12
K1
LED
PWR
LOGIC
CIRCUIT
A2
N / -
6 FAULTS
LED state Possible fault
PWR CH1 CH2 - No power supply to the module.
- Wrong wiring.
- Power supply conductor/s cut.
- External fuse broken.
- Short circuit between channels.
- Internal module fault.
PWR CH1 CH2 - Wrong wiring.
- Sticking of the start button contact
(monitored start).
- Internal module fault.
PWR CH1 CH2 - Internal module fault.
PWR CH1 CH2 - Wrong wiring.
- External contactors welded or expan-
sion module failure.
- Contactor/s cut.
- Contacts S11-S12 of the emergency
stop button or of the control device for
movable guards are open.
- Activation cycle for manual or monito-
red start (start impulse) missing.
- Internal module fault
Legend: = led on; = led off.
7 INSTRUCTIONS FOR PROPER USE
7.1 Installation
Attention: Do not exceed the tightening torque of the terminal screws specified
in the present operating instructions.
Attention: Observe the wiring of the terminals: incorrect wiring can damage the
device which may result in loss of the safety function.
- Install only inside a cabinet with protection degree not less than IP54 according to
EN 60529.
- Always affix the device with the specific DIN rail adaptor acc. to EN 60715.
- Do not stress the device with bending and torsion.
- Do not modify or open the device for any reason.
- The device carries out an operator protection function. Any inadequate installation
or tampering can cause serious injuries and even death, property damage, and eco-
nomic losses.
- These devices must not be bypassed, removed or disabled in any other way.
- If the machine where the device is installed is used for a purpose other than that
specified, the device may not provide the operator with efficient protection.
- The safety category of the system (according to EN ISO 13849-1), including the
Feedback circuit for external contactors
with manual or monitored start
L /+
K4 K5
F F F
K3 K6
S33
43 S34 13 23
44 14 24
K6 K3 K4
N /-
S31 S34 13 23 33
LED LED
CH1 CH2
LOGIC
CIRCUIT
K2
14 24 34 44
Recommended action
Check the wiring and
check the fuse.
If the fault persists,
replace the module.
Check the wiring and the
start switch.
If the fault persists,
replace the module.
Check the wiring.
If the fault persists,
replace the module.
Check the wiring, the
input channels and the
start configuration.
If the fault persists,
replace the module.
safety device, also depends on the external components connected to it and their
type.
- Before installation, make sure the device is not damaged in any part.
- Before commissioning, check the correct functioning of the module according to the
instructions of the operating diagrams (see paragraph OPERATION).
- Avoid excessive bending of connection cables in order to prevent any short circuits
or power failures.
- Do not paint or varnish the device.
F F
- Do not drill the device.
- Do not use the device as a support or rest for other structures, such as raceways,
sliding guides or similar.
- Before commissioning, make sure that the entire machine (or system) complies with
33 43
all applicable standards and EMC directive requirements.
- The documentation required for correct installation and maintenance is available
online in various languages on the Pizzato Elettrica website.
34 44
- Should the installer be unable to fully understand the documents, the product must
not be installed and the necessary assistance may be requested from the manufac-
turer (see paragraph SUPPORT).
K5 K6
- Always attach the following instructions to the manual of the machine in which the
device is installed.
- These operating instructions must be kept available for consultation at any time and
for the whole period of use of the device.
7.2 Do not use in the following environments
- In environments where continual changes in temperature cause the formation of
43 51
condensation inside the device.
- In environments where the application causes the device to be subjected to strong
impacts or vibrations.
- In environments with the presence of explosive or flammable gases or dusts.
- In environments containing strongly aggressive chemicals, where the products used
coming into contact with the device may impair its physical or functional integrity.
- Prior to installation, the installer must always ensure that the device is suitable for
use under the ambient conditions on site.
7.3 Maintenance and functional tests
Attention: Do not disassemble or try to repair the device. In case of any malfunc-
tion or failure, replace the entire device.
- The device installer is responsible for establishing the sequence of functional tests
to which the device is to be subjected before the machine is started up and during
maintenance intervals.
- The sequence of the functional tests can vary depending on the machine complex-
ity and circuit diagram, therefore the functional test sequence detailed below is to be
52
considered as minimal and not exhaustive.
- Perform the following sequence of checks before the machine is commissioned and
at least once a year (or after a prolonged shutdown):
1) Check that the safety module housing is undamaged and in good condition. If the
housing is damaged, replace the entire device.
2) Check that all signalling LEDs are working.
3) Check that the electrical cables are firmly lodged inside the terminals and connec-
tors.
4) Check that during operation the module behaves according to the operating dia-
grams provided in section OPERATION.
- The device has been created for applications in dangerous environments, therefore
it has a limited service life. Although still functioning, after 20 years from the date of
manufacture the device must be replaced completely. The date of manufacture is
placed next to the product code (see paragraph MARKINGS).
7.4 Wiring
Attention: Do not install the safety module if voltage is present. Power the device
only when the electrical circuits have been completely realized according to the speci-
fications indicated in the OPERATION paragraph. The first time you start the machine
ensure that there are no people close to hazardous areas.
- Check that the supply voltage is correct before powering the device.
- Keep the charge within the values specified in the electrical operation categories.
- Only connect and disconnect the device when the power is off.
- When using plug-in-type terminal blocks, they may only be plugged in or unplugged
if no supply voltage is present.
- Discharge static electricity before handling the product by touching a metal mass
connected to earth. Any strong electrostatic discharge could damage the device.
- Power the safety module and the other devices connected to it from a single SELV/
PELV source and in accordance with the applicable standards (applies only to ver-
sions with supply voltage 12 V and 24 V).
- It is recommended that the supply voltage of the safety module be electrically iso-
lated from the power section of the machine and the connection cables of the module
be laid separately from the power cables.
- Always connect the protection fuse (or equivalent device) in series with the power
supply for each device.
- Always connect the protection fuse (or equivalent device) in series to the safety
electrical contacts.
- During and after the installation do not pull the electrical cables connected to the
device. If excessive tension is applied to the cables, the device may be damaged.
7.5 Additional prescriptions for safety applications with operator protection
functions
Provided that all previous requirements for the devices are fulfilled, for installations
with operator protection function additional requirements must be observed.
- The utilization implies knowledge of and compliance with following standards:
EN ISO 13849-1, EN IEC 62061, EN 60204-1, EN ISO 12100.
- In the risk analysis, take into account that in manual start mode a possible sticking of
the start button can lead to an immediate activation of the module.
- If expansion modules or external contactors are used, make sure that they have
forcibly guided contacts and connect in feedback an NC contact of each device.
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