Single-channel all-digital AC servo drives QS7 Series
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8.3 Debugging
Before power on, it must check the correctness of the parameters Incorrect parameter setti
ng will may caused machine fault and accident
Suggestion no-load debugging firstly, then load debugging.
8.3.1 Adjustment of gain and rigidity
The servo system applies feedback system of PID adjustment, current loop, speed loop and
position loop. The rule it obeys is: the inside of the ring, the need to improve its ability of
response. Or it will appear over-adjust or vibration. As the current loop is enough to ensure its
ability of response, usually it doesn’t need to change. What should be adjusted are position loop
and speed loop.
The servo adjustment of position mode as below:
● Set a relative high value of speed loop integral;
● Set a relative low value of position loop gain, then begin to add the speed if there is no
vibration or abnormal noise;
● Adjust the value of speed loop integral to smaller if there is no vibration;
● Add the position loop gain until there is no vibration;
● If the electronic gear ratio is bigger, please adjust the value of P18 to make motors run at
quiet;
Knowledge of mechanical system’s rigidity:
● If the rigidity of the conveyors connected by belt is low, please use low rigidity
parameter;
● If the rigidity of the ball screw drove by gear box is medium, please use medium rigidity
parameter;
● If the rigidity of ball screw drove by servo motor is high, please use high rigidity
parameter.
The adjustment of servo depends on the system, which needs your careful watching, thinking,
then you can find suitable parameters.
Driver
Motor
Braking power
DC 12-24
Relay
Driver
Driver
7
8
