EUCHNER SGP-TWxxx (Twin) - Manual (Page 4)

Operating Instructions Safety Switch SGP-TW... (Twin)
Correct Use
Safety switches series SGP-TW are interlocking
devices without guard locking.
In combination with a separating safety guard, this
safety component prevents dangerous machine
movements from being performed for as long as the
safety guard is open. A stop command is triggered if
the safety guard is opened during the dangerous
machine function.
The safety switches series SGP-TW comply with the
regulations of EN 60947-5-1 (incl. Annex K) and
comply with the requirements of the employers’ liability
insurance associations for machines, installations and
personnel protection.
Before safety switches are used, a risk assessment
must be performed on the machine in accordance
with
EN ISO 13849-1, Safety of machinery. Safety related
parts of control systems. General principles for
design
EN ISO 14121, Safety of machinery. Risk
assessment. Principles
IEC 62061, Safety of machinery – Functional safety
of safety-related electrical, electronic and
programmable electronic control systems.
Correct use includes compliance with the relevant
requirements for installation and operation, particularly
EN ISO 13849-1, Safety of machinery. Safety related
parts of control systems. General principles for
design
EN 1088, Safety of machinery. Interlocking devices
associated with guards. Principles for design and
selection
EN 60204-1, electrical equipment of machines
Important:
The user is responsible for safe integration of the
device in a safe overall system. For this purpose
the overall system must be validated, e.g. in
accordance with EN ISO 13849-2.
If the simplified method according to section 6.3
EN ISO 13849-1:2008 is used for validation, the
Performance Level (PL) may be reduced if several
devices are connected one after the other.
If a product data sheet is included with the product,
the information on the data sheet applies in case of
discrepancies with the operating instructions.
Safety Precautions
Safety switches fulfill a personal protection function.
Incorrect installation or tampering can lead to severe
injuries to personnel.
Safety components must not be bypassed
(bridging of contacts), turned away, removed or
otherwise rendered ineffective.
On this topic pay attention in particular to the
measures for reducing the possibility of bypassing
according to EN 1088:1995.A2:2008, sec. 5.7.
The switching operation may only be triggered
by actuators specially provided for this purpose
which are permanently connected to the
protective guard.
Mounting, electrical connection and setup only
by authorized personnel.
Function
Safety switches series SGP-TW.. (Twin) have two
actuator heads. They permit the simultaneous
monitoring of two movable safety guards.
The safety switch signals that the safety guard is
closed.
The switch does not perform guard locking!
Closing
The safety contacts are closed by inserting the two
actuators.
Opening
The safety contacts are positively opened by
withdrawing one of the two actuators.
Lock Function (optional)
If the switch has a lock function, the drive’s safety
circuit can be opened and retained in this position
(see Figure 1). This prevents accidental starting of
the system.
Actuating the lock function
1. Insert key in the key opening
2. Rotate key from pos.1 (normal operation) to pos.2
(locked)
3. Remove key
4. Return to original position after use.
Indication
The lock function setting is indicated in the window.
Figure 1: Lock function and indication
Installation
Safety switches and actuators must not be used
as an end stop.
Mount the safety switch only in assembled
condition!
Assemble the safety switch so that
access to the switch is difficult for operating
personnel when the safety guard is open.
maintenance and replacement are possible.
Insert the actuator in the actuating head.
Mount the safety switch positively.
For safety-related applications (fixed position),
mount switch with M5x30 screws.
Permanently connect the actuator to the safety
guard so that it cannot be detached, e.g. using
the enclosed non-removable screws, rivets or
welding.
Fit an additional stop for the movable part of the
safety guard.
Changing the Actuating Direction
Figure 2: Changing the actuating direction
Remove the screws from the actuating head.
Set the required direction.
Correct arrangement of the screws (see figure 2).
Tighten the screws with a torque of 0.6 Nm.
Cover the unused actuating slots with the enclosed
slot covers.
Protection Against Environmental Influences
A lasting and correct safety function requires that the
actuating head must be protected against the
penetration of foreign bodies such as swarf, sand,
blasting shot, etc.
Cover the unused actuating slot with the slot cover.
Cover the actuating slot, the actuator and the rating
plate during painting work!
Only use solvent-free cleaning agents to clean the
switch!
Electrical Connection
When choosing the insulation material and wire
for the connections, pay attention to the over-
temperature in the housing (depending on the
operating conditions)!
For SGP-TW with plug connector:
For use and applications as per the requirements of
, a class 2 power supply or a class 2 transformer
according to UL1310 or UL1585 must be used.
Connection cables for safety switches installed at
the place of use must be separated from all moving
and permanently installed cables and un-insulated
active elements of other parts of the system which
operate at a voltage of over 150 V. A constant
clearance of 50.8 mm must be maintained. This does
not apply if the moving cables are equipped with
suitable insulation materials which possess an
identical or higher dielectric strength compared to
the other relevant parts of the system.
Version SGP-TW-1...
(cable entry M20x1.5/NPT ½“, see rating plate)
Break out the required entry opening.
Fit the cable gland with the appropriate degree of
protection.
The maximum conductor cross-section is 1.5 mm².
For pin assignment see Figure 3.
Tighten the screws with a torque of 0.6 Nm.
Check that the cable entry is sealed.
Close the cover and screw in position.
Version SGP-TW-2...
(plug connector SR6/SR11, see rating plate)
For pin assignment see Figure 3.
Functional Check
Warning! Danger of fatal injury as a result of faults
in installation and functional check.
Before carrying out the functional check, make
sure that there are no persons in the danger
area. Observe the valid accident prevention
regulations.
After installation and any fault, the safety function must
be fully checked. Proceed as follows:
Mechanical function test
The actuator must slide easily into the actuating head.
Close the safety guard several times to check the
function.
Electrical function test
1. Switch on operating voltage.
2. Close all safety guards.
The machine must not start automatically.
3. Enable operation in the control system.
4. Open the safety guard.
The machine must switch off and it must not be
possible to start it as long as the safety guard is
open.
Repeat steps 2 - 4 for each safety guard.
Marking
Safety circuit
closed
Safety circuit
open
Pos. 2
(locked)
Pos. 1
(normal
operation)