AB Quality Allen-Bradley 1394, User Manual

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Publication 1394-5.0 — May 2000
B-14 Interconnect and CE Diagrams
Thermal Interconnect Diagrams
Thermal switches, internal to each 1326 servo motor, can be wired in
series to protect the motor from overheating. In the event of a fault
condition, the switch opens and the motor responds to the system
configuration. The explanation and example diagrams that follow
show how to wire motor thermal switches for GMC, GMC Turbo, and
Analog Servo system modules.
Depending on the series of your of 1394 axis module, your customer
control devices may require isolation the from the motor’s conducted
noise. When using 1394 (Series A and B) axis modules, an isolated
24V DC power supply and relay is recommended. 1394 (Series C and
above) axis modules contain internal motor brake and thermal switch
filtering and do not require the isolation power supply and relay.
Individual thermal fault monitoring can be achieved with your 1394
GMC system by wiring each of the motor thermal switches to one of
four dedicated thermal fault inputs (THERM FLT0 - THERM FLT3).
Your 1394 system can then be configured to monitor and disable one
or all four of the axes. Alternately, you can wire the thermal switches
into the E-Stop string to disable all axes when a fault occurs.