MMD Equipment 400S-6B1 - Manual (Page 27)

4. Operation
4-4
A080054
Reset
4.2.4 Circuit protector (CP) for AVR protection
AVR is equipped with circuit-protector (CP) for
protection against overcurrent. Under the following
cases, it happens to function.
In case the machine gets overloaded while engine
speed is still lower.
In case the output voltage of generator is increased
higher than the specified voltage.
＜ Symptom＞
When circuit protector functions and load is applied
to the machine, such trouble as larger variance of
voltage and/or delayed voltage recovery follow.
＜ How to reset＞
Press the white colored AVR button inside the
control panel for resetting the circuit-breaker.
Note: Do not hold the button with such sharply pointed
things as a screwdriver, ball point pens etc.