Rockwell Automation Publication 750-UM003D-EN-P - March 2017 35
Verify Operation Chapter 3
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 43
for PTC trip resistance
thresholds.
Functional Proof Testing for Systems with PTC Devices
Build a test fixture with switches, resistors, a spare terminal plug (see Catalog
Numbers for Spare Terminal Plugs on page 7), and this schematic. Resistors
must be at least 1/8 W and 5% tolerance.
Over-temperature Functional Proof Test
To perform the PTC device over-temperature functional proof test, follow
these steps.
1. Close SW1.
2. Open SW2.
3. Run the drive.
4. 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 40.
5. 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.
PowerFlex 750-Series Drive or
PowerFlex 755T Drive Products
(755-Series drive shown)
SW2
2 kΩ 2 kΩ
SW1
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