Chino KP 2000 Series, Instructions Manual

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9-6-2. Precautions when power supply is started
1. P (proportion) operation when starting the power supply
Even though the settings of PID control are done, only the initial control operation at the time of power supply
becomes the P (proportion) operation. As a result, due to the conditions the output value becomes very big
momentarily during the power supply, hence take care.
2. Countermeasures against the erroneous output during power supply
During the power supply, until the controller starts normally, output related signals are sometimes
momentarily output. Implement the countermeasures against erroneous output as per the requirement by using
external circuit.
3.Precautions in case of momentary power cut off
When power supply is started again, operation status is depends on the settings of 'Operation when power
supply is started' of mode 1.
When 'CONTINUE' is selected, one returns to the status at the time of power supply cut off. In other words, if
status is RUN at the time of power cut off then it remains RUN and if it is RESET at that time it remains RESET.
When 'RESET' is selected, even if the status is 'RUN' in the setting screen and external signal input, the status
is always 'RESET'. At that time if change it to RUN again in the setting screen and external signal input, the
status becomes RUN. In this case the status becomes RUN from step number 00. Especially when using
external signal input take care about the sequence.
Even though the power supply cut off/start does not take place due to operation by the customer or due to
final product sequence, there is a temporary power cut off/start due to some reason, and even when the
controller detects the power supply cut off/start, the operation is performed based on the settings of 'Operation
at the time of starting the power supply' of mode 1. For example if a good quality power supply is not used, if
'RESET' is selected when a momentary power cut off etc. takes place, unknowingly the status becomes
'RESET' status, hence take care. Do not select 'RESET' as it adversely affects the entire system of the final
product when power supply is not stable.
Precautions
①
Take care while changing the settings during operation. Control may
sometimes be adversely affected due to parameters.
②
Use a good quality and stable power supply. Due to noise or
momentary power cut off the controller may sometimes be adversely
affected and it may sometimes malfunction unexpectedly.