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Thermal protection – Rockwell Automation CHPS-250 Linear Stage Installation User Manual

Page 42

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42

Rockwell Automation Publication CHPS-UM001D-EN-P - July 2014

Chapter 6

Connecting the Stage

Thermal Protection

Connect the stage PTC thermistor signal to the drive or control system to create
a thermal protection system.

The following thermal protection methods are also recommended.

Typically digital drives use RMS current protection and or estimated

temperature vs. time (I

2

T) software protection schemes. Activated and set

these available features according to the stage model ratings for your
application.

Set the maximum value of ± peak-current-magnitude limits of your drive

to the stage’s peak-current rating.

For drives without stage protection features, install stage fuses (current

rating not to exceed stage continuous RMS) according to local and
National Electrical Code. Uses time-delay type fuses that are rated for the
drive PWM output voltage.

PTC Thermistor Signal Characteristics

Temperature °C (°F)

Resistance in Ohms

Up to 100 (212)

750

Up to 105 (221)

7500

Up to 110 (221)

10,000

ATTENTION: PTC thermistor supplies a signal that indicates the stage
temperature limit condition. Connect this signal to control system or drive
system so it shuts down the stage power upon reaching a limit condition.
Multiple levels of stage thermal protection are strongly recommend.

This manual is related to the following products: