D41D

12

Operating Principle

Operating Principle

The safety outputs can be connected to the safety circuit of the control

system. The opening of a guard door, i.e. the actuator is removed out

of the active zone of the safety door switch, will immediately disable

the safety outputs of the safety door switch. (For operating distances,

refer to Ratings and Specifications on page 5.)

Any error that does not immediately affect the functionality of the

safety door switch (e.g. too high ambient temperature, interference

potential at the safety outputs, cross-wire short) will lead to a warning

message, disabling of the auxiliary output and a delayed shutdown of

the safety outputs. (Refer toTroubleshooting on page 16.)

The safety outputs are disabled if the error warning is active for 30

minutes. The signal combination, auxiliary output disabled and safety

channels still enabled, can be used to stop the production process in a

controlled manner.

After fault rectification, the error message is reset by opening and

reclosing the corresponding guard door. The safety outputs enable

and allow a restart.

Diagnostic Functions

Operating principle of the diagnostic LEDs

The safety door switch indicates the operating condition and faults by

means of three-color LEDs located in the lateral surfaces of the safety

door switch.

The green LED indicates that the safety door switch is ready for

operation. The supply voltage is on and all safety inputs are present.

Flashing (1 Hz) of the green LED signals that a voltage is missing on

one or both of the safety inputs (X1 and/or X2).

The yellow LED always signals the presence of an actuator within

range.

If the actuator is operating near the limit of the differential travel range

of the safety door switch, the LED is flashing.

The flashing can be used to prematurely detect variations in the

clearance between the safety door switch and the actuator (e.g.

sagging of a guard door). The safety door switch must be adjusted

before the distance to the actuator increases and before the safety

outputs are disabled, thus stopping the machine. If an error is

detected, the red LED will be activated.

Operating principle of the auxiliary output

An auxiliary output additionally indicates the operating condition (refer

to Table 1). The auxiliary output OUT can be used for central

visualization or control functions, e.g. in a PLC. It indicates the

switching condition as shown in Table 1.