CES-A-BBA EUCHNER, CES-A-BBA Datasheet - Page 48

• Manufacturer Part Number: CES-A-BBA
• Description: ACTUATOR
• Manufacturer: EUCHNER

Specifications of CES-A-BBA

• External Depth: 40.5mm
• External Length / Height: 131mm
• Operating Temperature Max: 55°C
• Operating Temperature Min: -0°C

Non-Contact Safety Switches CES/CEM
Non-contact safety switches CEM
Functional description
Non-contact safety switches CES have no guard locking. Therefore,
there is a risk that the machining process may be interrupted if
the safety door is opened unintentionally.
The safety switch CEM is the ideal solution for all customers who
must achieve a high level of safety when securing a safety guard
and also need guard locking to protect the process.
The guard locking on the safety switch CEM is not monitored by
the system as per EN 1088. As a consequence, the switch can
be used in all applications in which there are no hazardous,
overtravel machine movements.
If the overtravel machine movements do not represent a hazard
for the operator, the safety switch CEM can be used.
Design and functionality
The safety switch CEM comprises a CEM actuator and read head.
A CES read head and a solenoid are integrated into the CEM read
head. The CEM read head is connected to the CES evaluation unit
with a round M8 plug connector. The CEM actuator of identical
design also has a metal plate in addition to the transponder; this
plate acts as an armature for the solenoid coil.
When the safety door is closed, the CEM actuator enters the
operating distance of the CEM read head. The transponder signals
are transferred, and then the evaluation unit closes the safety
contacts and sets the OUT output "high". By applying voltage to
the solenoid for the CEM read head, strong magnetic forces can
be generated between the coil (in the read head) and the armature
(in the actuator).
Depending on the switch design – EUCHNER provides two diffe-
rent housing sizes – adhesive forces of approx. 500 N or 1000 N
respectively are applied between the CEM actuator and the CEM
read head. Practical experience has shown that these magnetic
adhesive forces effectively prevent any opening, even if the user
applies an enormous amount of effort.
Use of the switch even in extremely harsh environments
The safety switches CEM have an extremely robust design. The
high degree of protection IP 67 and the metal housing allow the
switch to be used in extremely harsh environments. The armature
plate for the CEM actuator has spring bearings and can be tilted
up to an angle of ± 4°. Therefore, when a maladjusted safety
door is closed, the CEM actuator adjusts itself independently to
the surface of the CEM read head. It is not necessary to readjust
the safety door when using the safety switch CEM. When mounting
the safety switch CEM, it is only necessary to ensure that the
CEM actuator is guided in front of the CEM read head when the
door is closed, so that the strong adhesive forces can be
generated.
Because the switch has only a small number of moving parts
which can wear, the mechanical life of the CEM switch is virtually
unlimited.
48
With transponder coding
Integrated solenoid (without monitoring of the guard locking)
Up to safety category 4
Subject to technical modifications; no responsibility is accepted for the accuracy of this information.
Different designs
EUCHNER provides two CEM housing designs. The two versions
differ in their dimensions, according to the size of the solenoid.
The safety switches CEM with an adhesive force of 1000 N are
used with large, heavy safety doors. This read head has an addi-
tional M8 plug connector for connecting an external LED display.
When voltage is applied to the coil, it is indicated to the user that
the safety door is in the locking position . An LED display in the
immediate vicinity of the door handle is extremely advantageous,
especially in the case of large, solid doors.
The smaller version of the safety switch CEM has an adhesive
force of approx. 500 N. It is suitable for securing smaller safety
doors and safety flaps.
An LED indicator in the M8 plug on the CEM A LE05K S2 read
head indicates to the user when voltage is applied to the solenoid.
Highest possible level of safety is achieved
EUCHNER offers various evaluation units for the safety switch
CEM:
In combined operation, it is possible to connect both CES read
heads (without guard locking) and CEM read heads to an evaluation
unit.
In the case of relatively large systems with several safety doors
to be monitored, it is advisable to lock the frequently used doors
during the production cycle – e.g. the doors in a cycling loading
station – to prevent the process being interrupted if the door is
opened. On doors that are not opened very often – e.g.
maintenance doors – a safety switch without guard locking is
adequate in many applications.
As the safety switch CEM only safely monitors the position of the
door and not the function of the guard locking, the switch can be
used in all systems without dangerous, overtravel machine
movements. The solenoid has the task of protecting the process;
it effectively prevents the unintentional opening of the safety guard
by the user.
With the two safety switches CES and CEM, EUCHNER has
launched on the market a totally new safety concept that is
significantly different to competitive solutions.
For the connection of one read head, the evaluation unit
CES-A-ABA-01B (safety category 3)
For the connection of one/two read heads, the evaluation unit
CES-A-ABA-02B (safety category 4)
For the connection of up to four read heads, the evaluation
unit CES-A-ABA-04B (safety category 4).