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Publication SAFETY-AT017B-EN-P – July 2011
Wiring Considerations
The following wiring considerations should be addressed for your
application:
The common for the digital input board on the PowerFlex
70 must be tied to the output common for the 1791ES-
IB8XOBV4 module.
This application example requires that a digital input on
the PowerFlex 70 drive be configured for Drive Enable.
This input must be controlled by the Guard I/O Safety
module.
The Drive Enable digital input on the PowerFlex 70 drive is
a solid state circuit. For this reason, the safety outputs on
the Guard I/O safety module must not be configured for
Safety Pulse Test as it may interfere with the operation of
the digital input.
If your risk assessment determines you must pulse test your safety
output circuits in order to catch shorts of P terminal to 24V or M terminal
to 0V, refer to
Achieving a Cat. 4 Safety Rating
, for an alternative wiring
schematic.
