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switch and PID controller

switch and PID controller

(OP)
Hello!
thanks for your time! i need your help to solve this problem:
i have a system that works with a constant flow rate when the current is zero and, when current is higher than zero, the inlet flow rate must be controlled by a PID controller.
Now i tried to use a Switch block: - the first input is the pid controller; - the second one is linked to current (the control variable) - the last one is the constant block.
the problem encountered are: - i can't automatically tune the PID block ("Pid Tuner could not find an initial stabilizing controller using plant "Plant")
and so the program does not work..
any other solution/ Approach?
thanks to everyone!

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