These panel meters are easy to configure by external resistors to give a desired reading from a measured dc input. The battery voltage meter was configured to show the voltage with a 100mV resolution. The battery pack current is measured using a 400A 75mV shunt resistor. Therefore the meter showing the battery pack current was configured to give a reading of 400 when the input voltage is 75mV.
The motor current will be measured from the current meter output of the Kelly Controls motor controller. I contacted the Kelly Controls support to get more information about their controllers current meter output and learned that it is generated with a 5V 8-bit pwm output which should be readable using any 5V panel meter. I configured the panel meter to give a reading of 400 when 5V is applied to its input. An isolated power supply is needed for the motor current metering as the panel meter connected to Kelly Controls current meter output is intented to be connected between +5V and the current meter output. Once the meters are installed it will be interesting to see how accurate current metering the Kelly motor controller can give.
2 comments:
My kelly keb72801 controller has "current meter" in its features list, but manual does not talk about it!
How do I access the meter?
Hi jumpjack2,
I received this reply from Kellycontroller support when asking how the amp-meter output works:
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"You can check the picture and wiring diagram of this meter here.
http://kellycontroller.com/amperemeter-with-free-diode-p-491.html
The period is 4.8ms
The MCU will detect the current from the motor.
Then the current will be translated into 255AD.
The MCU will send a 0-5V PWM signal to ampmeter port according to the variable from 0-255AD.
Technically speaking,it is voltage signal.
The diode is used to avoid the voltage circumfluence.
It is PWM signal.The MCU will adjust the duty cycle according to the current sample varying between 0 and 255AD."
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The KEB72801 does not seem to have the J1 connector so the connection diagram shown in the link above will not work for it. I guess the feature list for the KEB72801 is errorous. Otherwise you should get information about how to use the current metering output from Kellycontroller's support.
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