How to drive VFD (0-10V) with PWM signal from 7i37

Hi

I have Mesa 7i37TA card with PWM output, how i can drive typical VFD controlled with 0-10V DC?

I know, that i need circuit like this:


But, as i understand, 7i37TA outputs acts like relays.

So how it must be converted to 0-10V DC signal to VFD.

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Maksim

Yes the 7I37 outputs are like DC relays so your circuit will work except it needs one more component, a pulldown resistor (R2) to ground on the 7I37 output so you get a 10V pulsetrain.

so 7I37OBIT+ to +10V, 7I37OBIT0- to R1.1 and R2.1, R2.2 to ground R1.2 to capacitor

suggested values R2=200 Ohms, R1 = 1K, C=47 UF PWM Freq = 2 KHz

Thank you for the answer!

Is it all correct?

Yes