Rockwell Automation 20-750-ATEX PowerFlex 750-Series ATEX Option Module - Manual (Page 29)

Rockwell Automation Publication 750-UM003B-EN-P - July 2013 29
Chapter
3
Verify Operation
Verify Operation Test the safety function for proper operation after initial installation and after the
drive system is modified. We recommend that functional testing be performed
annually during regular maintenance intervals.
Description of Functionality The ATEX option module with 11-Series I/O option module provides ATEX
functionality for ATEX motors with thermostat contacts or PTC-type devices.
The module is designed to remove power from the gate firing circuits of the
output power devices (IGBTs) for the drive when the temperature circuit in the
motor indicates that the motor temperature is too high.
Motors with Thermostatic
Switches Thermostatic switches are arranged in series throughout the motor. Typically
there is a single switch, or a pair of switches, in each motor turn. Each switch
opens when the local temperature is too high. The ATEX option module with
11-Series I/O option module can detect an over-temperature event anytime the
circuit between the terminals is open.
WARNING: Risk of Explosion.
If any changes are made to an installed system, the operation of that system must
be verified. These changes include installation, removal, or modification of ATEX or
functional safety options. Failure to verify the operation of a completed installation
can result in a safety system that does not function correctly. See
Verify Operation
on page 29 .