EUCHNER CET-AX - Manual

Operating Instructions Read Head CET-AX with Guard Locking and Guard Locking Monitoring
Correct use
Series CET-AX read heads are operated in combi-
nation with an evaluation unit in the system family
CES-AZ. In this combination the read head CET-AX
is an electromagnetic interlock device with guard
locking and guard locking monitoring.
In combination with a safety guard and the machine
control, this safety system prevents the safety guard
from being opened while a dangerous machine
movement is being performed.
For the control system, this means that
f
starting commands which cause hazardous situ-
ations must become active only when the safety
guard is in protective position and the guard lock-
ing is in locked position. The locked position of
the guard locking must be released only when the
hazardous situation is no longer present.
Before safety components are used, a risk as-
sessment must be performed on the machine in
accordance with
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EN ISO 13849-1, Safety of machinery. Safety re-
lated parts of control systems. General principles
for design, Annex B
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EN ISO 12100, Safety of machinery - General
principles for design - Risk assessment and risk
reduction
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IEC 62061, Safety of machinery. Functional safety
of safety-related electrical, electronic and program-
mable electronic control systems.
Correct use includes compliance with the relevant
requirements for installation and operation, in
particular
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EN ISO 13849-1, Safety of machinery. Safety re-
lated parts of control systems. General principles
for design
f
EN 1088, Safety of machinery. Interlocking
devices associated with guards. Principles for
design and selection
f
EN 60204-1, Safety of machinery. Electrical equip-
ment of machines. General requirements.
The read head is only allowed to be operated in
conjunction with the intended EUCHNER CET actua-
tors and the related connection components from
EUCHNER. On the use of different actuators or
other connection components, EUCHNER provides
no warranty for safe function.
The read head CET is only allowed to be used in
combination with a system family CES-AZ evaluation
unit (see Table 2).
Important:
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The user is responsible for the integration of
the device into a safe overall system. For this
purpose, the overall system must be validated,
e.g. according to EN ISO 13849-2.
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Correct use requires observing the permissible
operating parameters (see Technical data).
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If a product data sheet is included with the
product, the information on the data sheet ap-
plies in case of discrepancies with the operating
instructions.
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The PL that can be achieved depends on the
installation position and the evaluation unit used.
Pay attention to the information in Table 2.
Exclusion of liability and warranty
In case of failure to comply with the conditions for
correct use stated above, or if the safety instruc-
tions are not followed, or if any servicing is not
performed as required, liability will be excluded and
the warranty void.
Safety precautions
Safety components fulfill personal protection func-
tions. Incorrect installation or tampering can lead to
fatal injuries to personnel.
Check the safe function of the safety guard par-
ticularly
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after any setup work
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after the replacement of a system component
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after an extended period without use
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after every fault
Independent of these checks, the safe function of the
safety guard should be checked at suitable intervals
as part of the maintenance schedule.
Fatal injury due to incorrect connection or incor-
rect use.
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Safety switches must not be bypassed (bridg-
ing 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 from
EN 1088:1995+A2:2008, Section 5.7.
The device may be installed and put into opera-
tion only by authorized experts
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who are familiar with the correct handling of
safety components
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who are familiar with the applicable EMC
regulations
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who are familiar with the applicable regula-
tions on health and safety and accident
prevention
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who have read and understood the operating
instructions and the system manual.
The switching operation must only be trig-
gered by actuators specifically provided for
this purpose (see Table 3) which are positively
connected to the safety guard.
Function
In the read head there is a lift tappet (1) that contains
the transponder (see Figure 1). The actuator has a
spring-mounted guard locking pin (2) in which there
is a CES actuator. The guard locking is active if the
lift tappet is retracted and the guard locking pin is
in the recess (3) on the read head.
f Version CET2, guard locking by solenoid force
The safety guard can be opened immediately in
the event of interruption of the solenoid power
supply! Usage only in special cases in accor-
dance with strict evaluation of the accident risk
(see DIN EN 1088 (1995), Section 5.5)!
Example: If the risk of accidental locking inside
a safety guard during a power failure is higher
than the risk of ineffective guard locking.
The lift tappet is initially extended by spring force.
The spring force on the guard locking pin is not
sufficient to press down the lift tappet. Only when
the guard locking solenoid is also switched on does
the lift tappet retract. The guard locking is active.
The guard locking operates in accordance with the
open-circuit current principle.
The safety door can be opened as long as the lift tap-
pet is held in the extended position by spring force.
Releases
Important:
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The releases are not safety functions.
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The machine manufacturer must select and use
a suitable release (escape release, emergency
unlocking, etc.) for a specific application. A risk
assessment appraisal is required for this purpose.
It may be necessary to take specifications from
a product standard into account.
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The releases must not be used to lock the switch
during maintenance work to prevent activation of
guard locking, for example.
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The correct function must be checked at regular
intervals.
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Loss of the release function due to mounting
errors or damage during mounting.
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Check the release function every time after
mounting.
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Loss of the release function due to tension on
the actuator. The door must not be under tension
during release.
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Observe the notes on the enclosed data sheets.
Mechanical release and mechanical key
release (can be retrofitted)
The mechanical release can be used to unlock guard
locking, irrespective of the state of the solenoid.
Using mechanical release
1. Unscrew locking screw
2. Using a screwdriver, turn the mechanical
release by around 180° in the direction of the
arrow
¨ The safety device can be opened
The mechanical release must be returned to its
original position and sealed after use (for example
with sealing lacquer).
Using mechanical key release
On devices with mechanical key release (can be
retrofitted), simply turn the key to unlock. For mount-
ing, see the mechanical key release supplement.
Figure 1: Read head and actuator
f Version CET1, guard locking by spring force
The lift tappet is pressed into the locked position
by the force of the spring for the guard locking pin
in the actuator and unlocked electromagnetically by
the read head. The guard locking functions in accor-
dance with the closed-circuit current principle. The
locked safety guard cannot be opened immediately
in the event of interruption of the power supply to
the solenoid.
The actuator's guard locking pin cannot be moved
out of the recess and the door is locked in the closed
position as long as the lift tappet is pressed down
by the guard locking pin.
When the operating voltage is present at the lock-
ing solenoid, the lift tappet is extended and lifts the
actuator's guard locking pin above the edge of the
recess. The safety door can then be opened.
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Actuator Read head