pizzato FG Serie Mode D'emploi page 6

VF KEYF28 actuator is used.
Actuators VF KEYF20, VF KEYF21 and VF KEYF22 have a maximum clearance of
1 mm in the vertical and horizontal directions to the switch input hole. The VF KEYF28
actuator has a maximum clearance of 2 mm in the vertical and horizontal directions
to the switch input hole.
Do not use a hammer for the adjustments, unscrew the screws and adjust the device
manually, then tighten it in position.
4.6 Escape release button
Some of the device versions are equipped with a release button
in order to allow any personnel accidentally trapped inside the
machine to get out. This button, complying with the
EN ISO 14119 standard, directly acts on the lock mechanism
and immediately releases the actuator regardless of the state of
the device.
This escape release button unlocks the guard even if the
device is not powered on.
For correct installation of the escape release button, the
following instructions are to be observed.
- The release button must be clearly visible from inside the
machine.
- Button activation must be easy, immediate and independent
from the machine operating status; to help you recognise
the button and explain its function, identification stickers are
available in various languages (contact the sales department for
detailed information).
- For an operator standing outside the machine, it must be
impossible to activate the release button when the door is
closed.
- To guarantee correct operation and easy resetting, a distance ranging from 10
to 25 mm must be kept between the wall from where the button protrudes and the
release button.
- The actuation path of the release button must always be kept clean. since dirt or
chemical products could compromise the device operation.
- The personnel concerned must be adequately trained on correct button operation,
so as to avoid any improper use (i.e. the button must not be used as a clothes-hook).
- The release button must not be used as a machine emergency stop.
- For installation on walls thicker than 15 mm, VF FG-LP30, VF FG-LP40, and
VF FG-LP60 version release buttons are available for 30 mm, 40 mm, and 60 mm wall
thicknesses respectively.
- For installation on walls thicker than 60 mm, the VF FG-LPRG version release button
with adjustable length via an M10 threaded bar is available.
For correct installation of the extensions, the following instructions are to be observed:
- do not exceed an overall length of 500 mm between the release button and the
device;
- always use medium resistance threadlocker adhesive on every threaded connection
between button, extensions, and device;
- avoid twisting or bending the release button. Where necessary, use an appropriate
sliding guide (pipe or bushing) with 18 ±0.5 mm internal diameter, if the button and its
extensions have a length greater than 60 mm.
4.7 Auxiliary release with a tool or a lock
Some of the device versions are provided with an auxiliary release in order to allow
an easy installation (release with a screwdriver) or the opening only to authorised
personnel (lock release). Both these mechanical release devices act inside the device
like the escape release button described previously. Therefore they also unlock the
guard in case of power failure. These release devices may only be operated by a
machine maintenance engineer who has received adequate training on the dangers
deriving from their use.
4.7.1 Use of the auxiliary release with a tool
- Unscrew the locking screw with a PH1 cross-head screw-
driver.
- Turn the hexagonal-hole bush clockwise by 180°.
- Do not force the bush beyond 180°.
- To avoid any improper use of the auxiliary device with a tool,
it is advisable to seal the device through the appropriate hole
found in the upper part, or to seal the screw cross head with
a few drops of paint.
- After each actuation, it is advisable to reseal the device.
4.7.2 Use of the auxiliary release with a lock
- Open the protection cap.
- Insert the key supplied with the switch and turn clockwise
by 180°.
- Do not force the key beyond 180°.
- Each time after the key is extracted, close the rubber cap.
- The release key must only be available to the machine main-
tenance engineer and kept in a secluded place.
- The release key must not be available to the machine op-
erator.
- Never leave the release key inserted in the device during
normal machine operation.
For particular applications, versions are available without any auxiliary release
device.
4.8 Electrical connections of the device
Attention: the safety circuit must be connected to the NC safety contacts. The
auxiliary contacts NO must be used for signalling only (see paragraph OPERATION).
The solenoid must be powered via the A1/A2 inputs with the power supply voltage
required for the different versions of the device (see paragraph TECHNICAL DATA)
To open the device cover, use a PH2 cross-head screwdriver; once operations are
completed, tighten the screws to a torque between 0.8 and 1.2 Nm.
4.9 State signalling LEDs
Items with code FG 6••••••A are supplied with two green LEDs to show from the
outside of the device the solenoid supply state. Electrical wiring is not necessary.
On request, versions with 2 LEDs of a different colour each are available to indicate
the state of the contacts (red and green for articles FG 6••••••B, orange and green for
articles FG 6••••••C). For these versions, the LEDs are supplied by two wires to be
connected between the selected contacts and the A1 supply terminal.
LED1
LED2
On request
Connection wires for
contacts to show
5 OPERATION
5.1 Access monitoring
This switch alone is not sufficient to protect any operators or maintenance engineers
in the event that they are able to physically enter the danger area with their whole
body, since any unintentional closing of a guard behind them could allow the machine
to be restarted.
In case the machine restarting control is entirely entrusted to this switch, a device
must be provided to avoid that risk, such as a lock-out system which stops the
machine from being restarted. A specifically designed lock-out device is available as
an accessory for the switch, which prevents any unintentional machine start up with
the operator still inside. Please contact our sales offices for more information (see
paragraph SUPPORT).
5.2 Definitions
The structure of these devices allows them to operate in three different states (see
table 1), i.e.:
- state A : with inserted and locked actuator
- state B : with inserted but not locked actuator
- state C : with extracted actuator
All or some of these states can be monitored by means of electrical NC contacts with
positive opening by selecting the appropriate contact block for the article. In particular,
electric contacts that are identified by the solenoid symbol (
transitions between state A and state B (and vice versa), while the electric contacts
identified by the actuator symbol (
state B and state C (and vice versa).
When the device is in C state, any activation or deactivation of the solenoid does not
influence the contacts' position of the solenoid itself (
All NC contacts of these devices are with positive opening and can be used for safety
circuits whereas NO contacts are normally used for signalling (see table 2). Table 2
shows the device contacts in state A. When the device is used in order to lock guards
on machines with inertia, the safety circuit must be connected to the switch contacts
activated by the solenoid ( ), which are closed when the actuator is inserted and
locked (state A). In this way you will be sure to be able to start the machine only when
guards are closed and locked.
If these switches are instead used for a general guards control and the machine stops
before the operator could enter the hazardous areas, then it is possible to use in the
safety circuit also NC contacts activated by the actuator (
Working principle D (solenoid normally de-energised)
Operating state
Inserted and locked Inserted and released
Actuator ( )
Solenoid ( )
Working principle E (solenoid normally energised)
Operating state
Inserted and locked Inserted and released
Actuator ( )
Solenoid ( )
Contacts
Contacts activated
activated by the
by the solenoid
Articles
actuator
1NO+1NC 1NO+1NC
FG 60A•••••
33-34 21-22 43-44
2NC 1NO+1NC
FG 60B•••••
11-12 21-22 43-44
6/24
Contacts to show
LED 1
LED 2
) are switched in the
) are switched in the transitions between
).
).
State A State B
De-energised Energised
State A State B
Energised De-energised
Table 1
Contacts activated
by the solenoid
Articles
2NO+1NC
FG 60M•••••
33-34
11-12 21-22
43-44
1NO+1NC
FG 60N•••••
31-32 13-14 21-22
A1
A2
State C
Extracted
Indifferent
State C
Extracted
Indifferent
Contacts
activated by the
actuator
1NO
13-14
2NO
33-34 43-44