Correct Use; General Safety Instructions; Manual Release - EUCHNER CET-AX Serie Manual De Instrucciones

Operating Instructions
Read Head CET-AX with Guard Locking and Guard Lock Monitoring

Correct use

Series CET-AX read heads are operated in combina-
tion 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
(type 4). The coding level depends on the evaluation
unit used (unicode or multicode evaluation).
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.
This means:
Starting commands that cause a dangerous ma-
f
chine function must become active only when the
safety guard is closed and locked.
The guard locking device must not be unlocked
f
until the dangerous machine function has ended.
Closing and locking a safety guard must not cause
f
automatic starting of a dangerous machine func-
tion. A separate start command must be issued.
For exceptions, refer to EN ISO 12100 or relevant
C-standards.
Devices from this series are also suitable for process
protection.
Before the device is used, a risk assessment must
be performed on the machine, e.g. in accordance
with the following standards:
EN ISO 13849-1, Safety of machinery – Safety-re-
f
lated parts of control systems – Part 1: General
principles for design
EN ISO 12100, Safety of machinery – Basic
f
concepts – General principles for design – Risk
assessment and risk reduction
IEC 62061, Safety of machinery – Functional
f
safety of safety-related electrical, electronic and
programmable electronic control systems
Correct use includes observing the relevant require-
ments for installation and operation, particularly
based on the following standards:
EN ISO 13849-1, Safety of machinery – Safety-re-
f
lated parts of control systems – Part 1: General
principles for design
EN ISO 14119 (supersedes EN 1088), Safety of
f
machinery – Interlocking devices associated with
guards – Principles for design and selection
EN 60204-1, Safety of machinery – Electrical
f
equipment of machines – Part 1: General re-
quirements
The read head is only allowed to be operated
in conjunction with the intended EUCHNER CET
actuators 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 must be operated only in com-
bination with an evaluation unit in the system family
CES-AZ-.ES-....
Important!
The user is responsible for the integration of
f
the device into a safe overall system. For this
purpose, the overall system must be validated,
e.g. in accordance with EN ISO 13849-2.
Correct use requires observing the permissible
f
operating parameters (see chapter "Technical
data").
If a product data sheet is included with the prod-
f
uct, the information on the data sheet applies
in case of discrepancies with the operating
instructions.
The PL that can be achieved depends on the
f
installation position and the evaluation unit used.
Pay attention to the information in Table 1.
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.

General safety instructions

Safety switches fulfill personal protection functions.
Incorrect installation or tampering can lead to fatal
injuries to personnel.
Check the safe function of the safety guard par-
ticularly
after any setup work
f
after the replacement of a system component
f
after an extended period without use
f
after every fault
f
Independent of these checks, the safe function of the
safety guard should be checked at suitable intervals
as part of the maintenance schedule.
WARNING
Danger to life due to improper installation or due
to bypassing (tampering). Safety components
perform a personal protection function.
Safety components must not be bypassed,
f
turned away, removed or otherwise rendered
ineffective. On this topic pay attention in partic-
ular to the measures for reducing the possibility
of bypassing according to EN ISO 14119:2013,
section 7.
The switching operation must be triggered only
f
by actuators designated for this purpose.
Prevent bypassing by means of replacement
f
actuators (only for multicode evaluation). For this
purpose, restrict access to actuators and to keys
for releases, for example.
Mounting, electrical connection and setup only
f
by authorized personnel possessing the following
knowledge:
- specialist knowledge in handling safety com-
ponents
- knowledge about the applicable EMC regu-
lations
- knowledge about the applicable regulations on
occupational safety and accident prevention.
Function
The read head contains a plunger (1) with which
the actuator is lifted over the recess during man-
ual release (see Figure 1). The actuator has a
spring-mounted guard locking pin (2) in which there
is a CES actuator. Guard locking is active when the
plunger is retracted and the guard locking pin is in
the recess (3) of the read head.
Figure 1: Read head and actuator
Version CET1, guard locking by spring force
The plunger 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.
8
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 plunger is pressed down by
the guard locking pin.
When the operating voltage is present at the lock-
ing solenoid, the plunger is extended and lifts the
actuator's guard locking pin above the edge of the
recess. The safety door can then be opened.
Version CET2, guard locking by solenoid
force
Important!
Use as guard locking for personnel protec-
tion is possible only in special cases, after
strict assessment of the accident risk (see
EN ISO 14119:2013, section 5.7.1)!
The plunger is initially extended by spring force.
The spring force on the guard locking pin is not
sufficient to press down the plunger. Only when the
guard locking solenoid is also switched on does
the plunger 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 plung-
er is held in the extended position by spring force.

Manual release

Some situations require guard locking to be released
manually (e.g. malfunctions or an emergency). A
function test should be performed after release.
More information on this topic can be found in the
standard EN ISO 14119:2013, section 5.7.5.1. The
device can feature the following release functions:
Auxiliary release and mechanical key release
(can be retrofitted)
In the event of malfunctions, the guard locking can
be released with the auxiliary release irrespective
of the state of the solenoid.
The safety contacts in the evaluation unit are
switched off when the auxiliary release is actuated.
Use the safety contacts in the evaluation unit to
generate a stop command.
Actuating auxiliary release
1. Unscrew locking screw
2. Using a screwdriver, turn the auxiliary release
to in the direction of the arrow.
Guard locking is released.
¨
Locking screw
Auxiliary release
Figure 2: Auxiliary release and mechanical key
release
Important!
The actuator must not be under tensile stress
f
during manual release.
After use, reset the auxiliary release and screw
f
in and seal the locking screw (for example with
sealing lacquer).