Rockwell Automation 440G-EMAS, Руководство пользователя, Страница: 16 / 44

16 Rockwell Automation Publication 440G-UM003A-EN-P - February 2020
Chapter 3 Project Planning
Figure 5 - No Potential Difference Between Load and Protective Device
Requirements for the Electrical Control of the Machine
• Use the control without test pulses. The safety switch is self-testing.
• The safety switch tests the OSSDs at regular intervals. To conduct this
test, it switches each OSSD briefly (for max. 1 ms) to the OFF state and
checks whether this channel is voltage-free during this time.
Make sure that the control of the machine does not react to these test
pulses and the machine does not switch off.
• The inputs of a connected evaluation unit must be positive-switching
(PNP), as the two outputs of the safety switch send a level of the supply
voltage in the switched on state.
The OSSDs are short-circuit protected to 24V DC and 0V. When the actuator is
in the response range of the sensor, the OSSDs signal the ON state with the
HIGH signal level (nonisolated). If the actuator is removed from the response
range of the sensor or there is a device fault, the OSSDs signal the OFF state with
the LOW signal level.
The safety switch complies with the regulations for electromagnetic
compatibility (EMC) for the industrial sector (Radio Safety Class A). Radio
interference cannot be ruled out when used in residential areas.
ATTENTION: Hazard due to lack of effectiveness of the protective device.
If non-compliant, it is possible that the dangerous state of the machine may not be
stopped or not stopped in a timely manner.
Downstream contactors must be positively guided and monitored depending on
applicable national regulations or required reliability of the safety function.
• Make sure that downstream contactors are monitored (external device
monitoring, EDM).
ATTENTION: Hazard due to lack of effectiveness of the protective device.
If non-compliant, it is possible that the dangerous state of the machine may not be
stopped or not stopped in a timely manner.
• Make sure that the following control and electrical requirements are met so the
safety switch can fulfill its protective function.