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Topic-icon PWM duty cycle input

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3 years 3 months ago #29532253 by Arunya
PWM duty cycle input was created by Arunya
Hi,
i am using SDC2130, and try to command motor driver with pwm duty cycle mode.I use signal genarotor to genarate duty cycle 20%-80% variation.I use toure mode close loop.I did calibrate 20% as min and 80% as max.But motor run 50%-60% one diraction and 50-40% other diraction.I cannot access the full range 50%-20% and 50%-80%.Motor rated max current is 3A and power supply also 3A.I will be thankfull for you help.

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3 years 3 months ago #29532255 by blake
Replied by blake on topic PWM duty cycle input
What do you have your PID gains tuned to? Based on the symptoms that you have reported it is likely that your gains require further tuning? We recommend beginning with PID=0,1,0 and then testing from there, changing as needed.

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3 years 3 months ago #29532256 by Arunya
Replied by Arunya on topic PWM duty cycle input
PID Gains were start with 2.0,1.0 and 0. I did put recommnd values, and k increase gradually with I.But results are same.when come to 60% duty cycle, motor suddenly stop and no rotation for beyond 60%. and also other diraction, 40% motorstop.I run with open loop, it works perfectly through the range of 20%-80% duty cycle.Look for futher guidance..Thank you

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3 years 3 months ago #29532258 by blake
Replied by blake on topic PWM duty cycle input
Which version of firmware is currently on your motor controller? Please send response to Console query ?FID.

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3 years 3 months ago #29532259 by Arunya
Replied by Arunya on topic PWM duty cycle input
FID=Roboteq v1.6 SDC2XXX 04/14/2016

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3 years 3 months ago #29532260 by blake
Replied by blake on topic PWM duty cycle input
Please send the configuration file you are using. You can post it here in .zip format or send it to This email address is being protected from spambots. You need JavaScript enabled to view it.

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3 years 3 months ago - 3 years 3 months ago #29532261 by Arunya
Replied by Arunya on topic PWM duty cycle input

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3 years 3 months ago #29532262 by blake
Replied by blake on topic PWM duty cycle input
When in Torque mode this means that the PWM output is proportional to whatever you have set as your Amps Limit. In your case I see you have 5A. That means that at 100% PWM 5A is being sent to the motor. However, you mentioned that your motor is only capable of handling 3A so it makes sense that your motor is stopping at 60% PWM. 5A*.6 = 3A. At 60% PWM your motor is already reaching the maximum current that it is capable of as well as the maximum current that your power supply is capable of. I would recommend changing the Amps Limit to 3A.

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3 years 3 months ago #29532268 by Arunya
Replied by Arunya on topic PWM duty cycle input
Thank you for your quick assitant, found problem in SMPS, which was defected by regenarative volatage.

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