Rockwell Automation 20-750-ATEX PowerFlex 750-Series ATEX Option Module - Manual (Page 27)

Rockwell Automation Publication 750-UM003B-EN-P - July 2013 27
Installation and Wiring Chapter 2
Operating Principle
The dry contact on the 11-Series I/O option module interrupts the safe stop
input channel 0 (SS_IN_CH0 pin S12) on the safe speed monitor option
module. The maximum SIL capability of the ATEX function is SIL1. The
maximum SIL capability of the equipment utilizing the safe speed monitor
option module remains the same.
Safe Speed Monitor (SSM) Configuration Requirements
The following safe speed monitor parameters enable the ATEX function to
immediately remove power to the motor in case of a ATEX fault condition.
You
must set parameter 44 [Safe Stop Input] to one of these options:
• 1 - 2NC
• 3 - 1NC+1NO
You
must set parameter 45 [Safe Stop Type] to one of these options:
• 0 - Torque Off
• 3 - Trq Off NoCk
Reset the Drive after an SSM
Fault Detection The reset sequence depends on the configuration of the reset type for the SSM.
Follow these steps to reset the drive.
1. Clear the ATEX fault condition.
2. Issue a clear fault command.
3. Cycle the safety device wired to both channels of the safe stop input so that
both SS_IN_CHx inputs are cycled low to high.
If the SSM reset type is ‘automatic’, the drive is fully reset. Manual and
Manual-monitored modes require the reset input to the SSM card to be
either high, or cycled before the drive is fully reset.
Interface Without a Safety
Option The ATEX option module with the 11-Series I/O option module can be used
without a safety option with the safety signal on the backplane. The EnC and
EnNO contacts can be left un-wired.
WARNING: Risk of Explosion.
You must set parameter 44 [Safe Stop Input] and parameter 45 [Safe Stop Type] to
one of the options defined in this section.
Setting the parameters to a different option can result in an explosion.