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9. Protective Functions
9. Protective Functions
There are 4 patterns of circuits prepared as a protection function.
(1) Over Current Protection Circuit
The voltage suddenly drops when the current more than the rated value is output (includes
short circuit). Power output automatically recovers when the over current condition is
cancelled.
There is a case that the over current protection circuit works due to the in-rush current
caused by turning ON multiple controllers at the same time.
Described above is concerned as the cause of the phenomenon of sudden voltage drop
occurring when turning ON each actuator controller, emergency stop being cancelled, and
so on.
(What happens as the influence of the voltage drop is that it takes comparatively long time
at the start-up of the controllers or canceling the emergency stop.)
In the case this is occurred, it is necessary to boost the controllers one by one, or add
another power supply.
(2) Over Voltage Protection Circuit
The over voltage protection circuit works when the output voltage rises abnormally high.
If the voltage continues to rise, it shuts down the output. To recover, shut down the input
power first, leave it for approximately 2 minutes, and then input the power again.
When the over voltage protection works, internal devices may break. If output does not
work properly even though trying to turn ON the power several times, it may require a
repair. (Please contact us.)
(3) Over Temperature Protection Circuit
The over temperature protection circuit detects an abnormal rise of the ambient
temperature and internal temperature (approx. 80
°
C), and shuts down the output.
To recover, shut down the input power first, leave it for a while till it cools down, and then
input the power again. If the over temperature protection works often, lower the ambient
temperature and the duty ratio.
(4) Over Load Detection
When the over load detection circuit works, the output drops with accordance with the duty.
Output will recover with a lower duty. It operates when the current of approximately 8.7A or
more continues to flow.