beautypg.com

Function of the guard locking – EUCHNER CETx-AS-xxx-CB-xxx (Multicode) User Manual

Page 8

background image

Operating Instructions Safety Switch

CET.-AS-...-CB-...

8

Function of the guard locking

Version CET3-AS,

guard locking by spring force with door monitoring output

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 safety

switch.
The guard locking solenoid is switched by software via AS-Interface output bit D0.
The guard locking functions in accordance with the closed-circuit current principle.
The guard locking cannot be opened directly if the guard locking solenoid is switched

off by means of AS-Interface output bit D0. The door can be opened directly if

the guard locking solenoid is switched on by means of AS-Interface output bit D0.

Closing safety guard and activating guard locking

The lift tappet is pushed down by the actuator. The door monitoring contact and

the solenoid monitoring contact are closed. The complete safety code sequence

is sent via AS-Interface input bits D0 to D3.

Deactivating guard locking

Switching the guard locking solenoid off via AS-Interface output bit D0 extends the

lift tappet and raises the actuator's guard locking pin over the edge of the recess.

The half-sequence is sent via AS-Interface input bits D0 and D1 in every bus cycle.

Opening safety guard

Opening the safety door moves the actuator out of the operating distance. The

values 0, 0, 0, 0 are continuously sent via AS-Interface input bits D0 to D3.

Version CET4-AS,

guard locking by solenoid force with door monitoring output

Important:

The safety guard can be opened immediately in the event of interruption of the
solenoid power supply! Usage only in special cases in accordance 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 guard locking operates in accordance with the open-circuit current principle.
The lift tappet is held in locked position by electromagnetic force and released by

spring force. The guard locking solenoid is switched by software via AS-Interface

output bit D0.