DANGER
Hazard due to lack of effectiveness of the protective device
In the case of non-compliance, it is possible that the dangerous state of the machine
may not be stopped or not stopped in a timely manner.
b
Make sure that the following control and electrical requirements are met so the
safety switch can fulfill its protective function.
•
The external voltage supply of the safety switch must be capable of jumpering brief
power failures of 20 ms as specified in IEC 60204-1.
•
The power supply unit must provide safe isolation according to IEC 61140 (SELV/
PELV). Suitable power supply units are available as accessories from SICK.
4.4.2
Course of the OSSD test over time
OSSD 1
V
t
1
OSSD 2
V
t
300 µs
300 µs
Figure 6: Course of the OSSD test over time
1
Usually every 40 ms.
The interval is dynamic and can be smaller than 40 ms.
4.4.3
Controlling the locking solenoid
The locking solenoid is activated through the upstream control. There is no internal acti‐
vation or deactivation of the locking solenoid through the safety switch. The locking
device and locking force are not monitored. When the machine starts, the following
sequence must be followed:
1
Check whether safety switch OSSDs are in the ON state.
2
Supply the locking solenoid with power.
3
Start the machine.
4.4.4
Application diagnostic output
Switching behavior of the application diagnostic output
The application diagnostic output signal changes as soon as the actuator is moved into
or out of the response range of the safety switch. That is, when the movable protective
device is opened or closed. This is not a safety output.
Table 2: Switching behavior of the application diagnostic output
Actuator
Application diagnostic output
Actuator not in the response area, or safety
switch in an error state
OFF
Actuator in the response area
ON
4
PROJECT PLANNING
16
O P E R A T I N G I N S T R U C T I O N S | MLP1
8020169/ZJN1/2018-03-21 | SICK
Subject to change without notice
