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Old 03-03-2018, 10:52 PM   #1
adog35
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Default 98 EZ-GO Diagnostics and Logs

98 EZ-Go Series. Axle Lift, 23” Tires, AMD 7122, 4GA cables, Curtis 1205M-5603 500 Amp, HD Selonoid, 36V, Top
Speed 21 MPH



I am trying to diagnose the low torque / lack of initial acceleration in my cart. I hooked up my Curtis cable and took a few logs. Logs are done on 36V, flat ground.

https://drive.google.com/drive/folde...30?usp=sharing



Amps:
I used a True RMS clamp meter to read the amps being drawn.
Up hill: 349 AMP
Flat Ground: 335
These readings were taken starting a 0% throttle and going to 100% quickly.
I would run the cart for 50 yards then check the inrush / max amp draw.

These amp readings seem low to me and would be consistent with the lack of
torque I am feeling. Is there a way to determine if this is a controller or motor
creating this?



48V test: I borrowed additional T-105's and tested the cart on 48V. Controller is programmed for this test. It had about 30% greater top speed, but I felt minimum change in initial torque. It did deliver a boost in torque once the motor had some RPM's in it. I also checked the AMP draw on 48V and it was similar. Cart is now back to 36V until I know what is going on.
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Old 03-04-2018, 10:55 AM   #2
adog35
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Default Re: 98 EZ-GO Diagnostics and Logs

In addition even on 48v what I am unhappy with is the lack of initial power. My only
Thought would be that the AMD 7122 Motor is designed to be used with a stock controller.
(275 AMPS). The design could be built to limit the amount of amps the motor draws to protect the controller.

Where as other motors require a controller upgrade.


Any input or suggestions is always appreciated!
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Old 03-04-2018, 12:53 PM   #3
JohnnieB
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Default Re: 98 EZ-GO Diagnostics and Logs

In the log #1, did you slam the pedal to the floor, or slow depress it over 2.5 second interval?

The log shows it took 5 samples (sample rate about 0.5 seconds) to go from 0% to 100% throttle.

The log also shows the is a 1.5 second (3 samples), or so, between 100% throttle and 100% output. (Output is at 100% when motor voltage equals battery voltage)

If you slammed the pedal to the floor, it took about 4 seconds for the controller's PWM output to reach 100% duty-cycle, so acceleration would be dismal.

Even if the pedal was pressed slowly to floor, it still took 1.5 seconds for the PWM output to reach 100% duty-cycle with a 100% throttle input, which is also likely to be perceived as dismal acceleration.

The minimal increase in torque noticed at 48V, also indicates slow throttle response.

-----------
The amps a motor draws is inversely proportional to the armature RPM, so the slower the armature is turning, the more amps the motor is capable of drawing. With the long throttle up ramp, the armature is spinning relatively fast by the time the controller's PWM output reaches 100% duty-cycle, so the amp draw is lower than what it would be with a faster up ramp.

With 23" tires you lose about 22% of the available torque where rubber meets road and the AMD 7122 is a high speed motor, so it's low RPM torque is less than what is produced by a standard-speed or high-torque motor.

Coupling those two factors with a long throttle up ramp would equate to lousy acceleration.

-------------
Put a SR48500 in it and you can adjust it to give you more satisfying acceleration.
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Old 03-04-2018, 01:13 PM   #4
adog35
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Default Re: 98 EZ-GO Diagnostics and Logs

Quote:
Originally Posted by JohnnieB View Post
In the log #1, did you slam the pedal to the floor, or slow depress it over 2.5 second interval?

I slammed the pedal to the floor. I do see how the ramp up took
sometime before it reached 100%. That makes a lot of sense now that you explained it. Stupid curtis controller :/



Looks like I should have listened to you guys and ordered an AllTrax
from the start!
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Old 03-04-2018, 01:33 PM   #5
cgtech
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Default Re: 98 EZ-GO Diagnostics and Logs

That can be adjusted with the programmer. Programmer can be rented on eBay. -4401 is the programmer version you want.
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Old 03-04-2018, 01:38 PM   #6
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Default Re: 98 EZ-GO Diagnostics and Logs

Quote:
Originally Posted by cgtech View Post
That can be adjusted with the programmer. Programmer can be rented on eBay. -4401 is the programmer version you want.
I have the programmer. Have the acceleration rate and quick start set
as fast as they will go. 0.4 and 0.2 seconds.
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Old 03-04-2018, 01:50 PM   #7
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Default Re: 98 EZ-GO Diagnostics and Logs

I wasn't aware it was field programmable.

Here's the manual, programming is Section-3

-----------
oops, you posted while I was typing, you probably already have the manual.
Attached Files
File Type: pdf 1204m1205m_n.pdf (816.4 KB, 0 views)
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Old 03-04-2018, 03:39 PM   #8
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Question Re: 98 EZ-GO Diagnostics and Logs

Quote:
Originally Posted by JohnnieB View Post
I wasn't aware it was field programmable.

Here's the manual, programming is Section-3

-----------
oops, you posted while I was typing, you probably already have the manual.

Yes, I checked all the parameters. The log was done with
the acceleration and quick start set to their fastest setting.

Unless I’m missing something else I think it’s time for an AllTrax controller.
A little disappointing, always thought Curtis was suppose to be great.
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Old 03-04-2018, 04:08 PM   #9
JohnnieB
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Default Re: 98 EZ-GO Diagnostics and Logs

Quote:
Originally Posted by adog35 View Post
Yes, I checked all the parameters. The log was done with
the acceleration and quick start set to their fastest setting.

Unless I’m missing something else I think it’s time for an AllTrax controller.
A little disappointing, always thought Curtis was suppose to be great.
Dumb question: Does the programmer have a set button or something similar that has to be pushed for controller to take new settings.
If so, was it pushed?

From what I see on the log, the up ramp time is far longer than 0.4S.

The controller might have some issues, maybe contacting Curtis might help.


Of course, IMHO, getting an Alltrax SR controller would be best.
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Old 03-04-2018, 04:24 PM   #10
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Default Re: 98 EZ-GO Diagnostics and Logs

There is no set button on the programmer or PC station. I doubled checked the parameters
we’re saving by disconnecting and reconnecting.

I will reach out to Curtis, but since I purchased it from an online seller I am unsure they will help.

AllTrax SR is likely the best choice.
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