
COUT Minimum Current
Hello,
I am trying to run a Mitsubishi VFD that takes a current input of 4-20mA to change what hz the connected motor is running at. The VFD says it's not receiving a current command.
I see this excerpt in the manual:
Minimum current
There are several diagnostics methods that are active, one of these methods is based on
measuring current. The threshold for detection has been selected based on the
assumptions that currents below specified minimum current does not cause movement.
Error detection limits and delay
The COUT has two separate measurements of current, and is capable of detecting drift
faults on the closed loop control of the output. To avoid spurious trips, it is designed to
tolerate some deviation. The worst-case detection time for the most severe type of
faults are listed in the table below:
Since the MC4xFS COUT channels are grouped in pairs sharing an internal high-side
driver channel, shutdown of one COUT will cause shutdown of both COUT channels
in the pair. Restart conditions are controlled by the application.
Appendix B has detailed lists of failure modes focused on output wiring faults.
C4x-SMR-027:A Minimum current when using COUT
Safety related output functions controlled by COUT shall be designed so that
movement can only be activated if the output current is > 100 mA.
Maybe I'm misunderstanding, but if the minimum current is 100mA, why does it let me set a COUT range of 4-20mA without throwing an error?

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Customer support service by UserEcho