Rockwell Automation 20-750-ATEX PowerFlex 750-Series ATEX Option Module - Manual (Page 9)

Rockwell Automation Publication 750-UM003B-EN-P - July 2013 9
Chapter
1
Safety Concepts
Introduction The PowerFlex 750-Series ATEX option module, installed in a PowerFlex
750-Series drive equipped with an 11-Series I/O option module, provides an
ATEX compliant safety function. This ATEX compliant function provides a safe
turn-off for equipment installed in a potentially explosive atmosphere according
to European Council Directive 94/9/EC.
The overall system includes an ATEX certified motor installed in a potentially
explosive atmosphere. The motor is equipped with a thermal sensor connected to
the ATEX option input. Do not install the drive in a potentially explosive
atmosphere. See
Figure 1 .
Figure 1 - Basic ATEX Application
The ATEX option module monitors the thermal sensor in the motor. When the
thermal sensor reaches its trip point, the drive initiates a safe torque-off function
and removes torque-producing power from the motor. The ATEX safety
function has a safety integration level (SIL) capability limit of 1 according to
IEC 61508.
WARNING: Risk of Explosion.
Do not install the PowerFlex 750-Series drive in a potentially explosive
atmosphere.
A drive installed in a potentially explosive atmosphere can cause an explosion.
PowerFlex 750-Series Drive
Power to the Motor
Thermal Sensor Input to the Drive
Potentially Explosive Atmosphere
ATEX Certified Motor