Rockwell Automation 440G-EMAS, Руководство пользователя, Страница: 17 / 44

Rockwell Automation Publication 440G-UM003A-EN-P - February 2020 17
Project Planning Chapter 3
• The external voltage supply of the safety switch must be able to withstand
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). We have suitable power supplies available as
accessories, contact your local Allen-Bradley distributor or
Rockwell Automation sales office.
Course of the OSSD Test Over Time
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.
Locking Solenoid Control
The locking solenoid is activated through the upstream control. There is no
internal activation 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.
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 output is not a safety output.
For more information, see Specifications on page 31 .
Table 1 - 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
OSSD 1
V
t
OSSD 2
V
t
300 μs
300 μs
(1)