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Answered

PWM MR Values

BLC 3 months ago updated by Gustav Widén (System support) 2 months ago 2

I am trying to control a valve without over speeding the pump. What would the MR values need to be? Does 100% command at a 100% Max MR value equate to the source voltage, in this case 24VDC? See coil characteristics below. 

Answer

+1
Answer

If you have an important function like this you should not use PWM outputs from IQAN, you should use COUT. The PWM outputs from IQAN are not temperature compensated and you will see consistency / repeatability problems. When you use the current output channels with IQAN you will be able to set minimum and maximum current requirements easily and the current will compensate for changes in coil resistance.

+1
Answer

If you have an important function like this you should not use PWM outputs from IQAN, you should use COUT. The PWM outputs from IQAN are not temperature compensated and you will see consistency / repeatability problems. When you use the current output channels with IQAN you will be able to set minimum and maximum current requirements easily and the current will compensate for changes in coil resistance.

Answered

As Tim wrote, it is better to use COUT for this function. The IQAN COUT is a PWM output with current control, you can just enter the max current and the MR will be controlled automatically, compensating for the temperature dependent change in coil resistance and also for variation in supply voltage.