Rockwell Automation 20-750-ATEX PowerFlex 750-Series ATEX Option Module - Manual (Page 30)

30 Rockwell Automation Publication 750-UM003B-EN-P - July 2013
Chapter 3 Verify Operation
Functional Proof Testing for Systems with Thermostat Contacts
Build a test fixture with a switch, a spare terminal plug (see Catalog Numbers for
Spare Terminal Plugs on page 5 ), and this schematic.
Follow these steps to perform the thermostat contacts functional proof test.
1. Close SW1.
2. Run the drive.
3. Open SW1.
If the system is working correctly, the drive faults due to a motor
over-temperature event detection. See
ATEX Fault Descriptions on
page 34 .
4. If a safety option is present, check parameter 933 [Start Inhibits] and
verify that bit 2 [Enabled] and bit 7 [Safety] are set to high.
Motors with Positive
Temperature Coefficient
(PTC) Devices PTC-type devices are arranged in series throughout the motor. The resistance of
each PTC goes up as the motor temperature rises. The ATEX option module
with 11-Series I/O option module can detect an over-temperature event. See
General Specifications on page 37 for PTC trip resistance thresholds.
SW1