What is the maximum torque G15 can withstand by default?

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What is the maximum torque G15 can withstand by default?

Postby whatsap45 » Sat Jun 07, 2014 10:46 am

7. Setting the operating voltage to 7V to 12V for G15 with ID of 0
7 Volt =70 (0x46), 12 Volt= 120 (0x78)
Instruction: WRITE DATA
Address to Write: 0x0C
Data: 0x46, 0x78
Send Packet: 0xFF, 0xFF, 0x00, 0x05, 0x03, 0x0C, 0x46, 0x78, 0x2D
Receive Packet: 0xFF, 0xFF, 0x00, 0x02, 0x00, 0xFD
Description: Operating voltage change successful if the Error byte in return packet
is 0.

8. Setting the Maximum Torque to 50% of maximum value for G15 with ID 0
50% of maximum torque value is 0x1FF.
Instruction: WRITE DATA
Address to Write: 0x0E
Data: 0xFF, 0x1F
Send Packet: 0xFF, 0xFF, 0x00, 0x05, 0x03, 0x0E, 0xFF, 0x01, 0xE9
Receive Packet: 0xFF, 0xFF, 0x00, 0x02, 0x00, 0xFD
Description: Maximum Torque change successful if the Error byte in return packet
is 0.

Q1. First of all, how to set all the parameters as shown above?

Q2. May i know what is the max torque of the G15 can withstand by default? Is it already 100% of its max torque by default?
If the default torque is not 100%, then how to change that?

Q3. May i know what is the max voltage of the G15 is set by default? Is it already 12V by default?
If the default torque is not 12V, then how to change that?

My question arises from my problem of turning a load of 3kg with turning radius of 1cm. According to the spec, it shud be enuf to turn the load at 12V, but my G15 was not able to move and the LED keeps on blinking?
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Re: What is the maximum torque G15 can withstand by default?

Postby yonghui » Mon Jun 09, 2014 8:24 am

Can you show a photo of your hardware setup?

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Re: What is the maximum torque G15 can withstand by default?

Postby whatsap45 » Mon Jun 09, 2014 10:39 am

The photo is as shown in the attachment
Attachments
2014609103539.jpg
G15 motor connected to a 3kg load
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Re: What is the maximum torque G15 can withstand by default?

Postby sich » Mon Jun 09, 2014 12:06 pm

whatsap45 WROTE:Q1. First of all, how to set all the parameters as shown above?

What microcontroller platform are you using? We encourage the use of Arduino as Cytron has created G16 Shield to help getting started easier. The Arduino library is provided too. You can refer to this tutorial and also the Useful Document section of G15 Shield product page.

whatsap45 WROTE:Q2. May i know what is the max torque of the G15 can withstand by default? Is it already 100% of its max torque by default? If the default torque is not 100%, then how to change that?

The factory default value for Max Torque parameter is 1023 (maximum), unless it has been overwrote by user. So it's default max torque is 12kg.cm at 12V.

whatsap45 WROTE:Q3. May i know what is the max voltage of the G15 is set by default? Is it already 12V by default?
If the default torque is not 12V, then how to change that?

You just need to supply power to G15 between 6.5V and 15V. The rated torque is measured at 12V.

whatsap45 WROTE:My question arises from my problem of turning a load of 3kg with turning radius of 1cm. According to the spec, it shud be enuf to turn the load at 12V, but my G15 was not able to move and the LED keeps on blinking?

There are several possible problems here.
Firstly, since the LED is blinking, it could be any error stated in Alarm LED of G15 User Manual, page 24. Please make sure it's clear from all the error - voltage, instruction and so on.
Secondly, from your photo I'm not sure how big is the white board. Even if it's 3kg load mounted at a shaft with 1cm radius, it doesn't mean the calculation is 3x1 = 3kg.cm. That's definitely wrong. You have to consider how long does the board extended out from the center of the shaft.
Lastly, I don't see the use of flexible shaft coupling. So if your mounting is not perfect, the misalignment may cause the shaft of G15 under great stress, hence restrict the normal rotation. However, this wouldn't be a problem if the misalignment is little and negligible.
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Re: What is the maximum torque G15 can withstand by default?

Postby yonghui » Mon Jun 09, 2014 2:54 pm

hi,

can the G15 rotate if the card board is not attached? i hope you have checked that the packet sent the G15 is correct.
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Re: What is the maximum torque G15 can withstand by default?

Postby whatsap45 » Mon Jun 09, 2014 6:16 pm

To sich,

Im using Arduino ATmega328 microcontroller. Actually, I don't know how to check the byte value from G15. For example, say the byte value received from ALARM LED is 0x44, then the bin value shud be 01000100 which shows it is either instruction error or overheating error, this I understand. But, where can i retrieve the ALARM LED byte value of 0x44 from, in other words, how do I know the ALARM LED byte value is 0x44?

As for the dimension of the board, it is 66.6cm by 43.2cm. So, the length of the board extended out from the centre of the shaft is half of 43.2cm which is 21.6cm. Anyway, for my calculation, this is how i did, i took the heaviest case scenario of the panel when it is aligned normal to the ground, which gives approximately 3kg of load as shown in the attachment.

ds.PNG
Heaviest scenario of the panel
ds.PNG (13.2 KiB) Viewed 6312 times


So, the calculation would be :-

Required torque, τre = ( Fload )× (turning radius)
= [ 3(9.81) ] × (0.01)
= 0.8829Nm

Rated torque, τrated = 12kg.cm
= ( 12 × 9.81 ) / 100
= 1.1772Nm

Since rated torque is higher than the required torque, it should be able to move ma?

To YongHui,

Yes, it can be moved perfectly fine when it is not attach to the panel. Also, it can be moved when the panel is attached sometimes, but most of the time cannot.
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Re: What is the maximum torque G15 can withstand by default?

Postby yonghui » Tue Jun 10, 2014 9:31 am

U can get more info from the library reference from here
https://code.google.com/p/cytron-g15-shield/w/list

U will create a 2byte variable to receive the status error. Then U can refer to this to get the error information
https://code.google.com/p/cytron-g15-sh ... turnStatus


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Re: What is the maximum torque G15 can withstand by default?

Postby whatsap45 » Tue Jun 10, 2014 11:23 am

Btw, I'm not using a G15 shield, my setup configuration is a G15 motor, GD02 driver, and Arduino UNO.. the reference still applicable in this case?
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Re: What is the maximum torque G15 can withstand by default?

Postby whatsap45 » Tue Jun 10, 2014 11:34 am

btw, can u show an example on how to read the byte value, say to read the overload of ALARM LED?
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Re: What is the maximum torque G15 can withstand by default?

Postby yonghui » Tue Jun 10, 2014 7:48 pm

Actually still can use the same library and library ref. The only different is that the control pin polarity defined in the library. Will need to change it if use shield library. Library ref is same

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