Problem with NI 9472 module

[Nemesis]

Hello,

I have a module NI 9472. I am trying to use it as a switch for 4 cases. I have to fans 24V / 0.17 A, a linear controller 24V / 0.6 A and a converter 24V to 12 V max 2 A. I connected all as it was written in the specification of the module. The two fans is working fine I can switch on/off without problem but two others don't want to start. Even if I use more channels in parallel in order to get more current. It doesn't want to switch on. Do you have any suggestion regarding this? 

Thank for replay.

Kamil

[Nemesis]

Nobody can help me?

[Michiel_H]

Hi Nemesis

Some additional questions relating your issue:

- Do the channels you use for the convertor & controller work when you connect a fan to them (I suppose you tested this, but just to make sure 🙂 )

- What kind of output are you trying to generate? Is it static DO or are you generating a PWM signal to drive the units?

- Could you measure the value between the DO and Vsup ? If possible, try to measure the current level you have with a scope or so during turning on of the linear controller or the converter (without using the module).

- Do you see any response on the LED of the respective channels?

I suspect the current of the 2 not working items is very temporarely exceeding the module limits when you turn on the channel. This causes the module to 'trip' the channels into an overcurrent state (see page 14 of the module specifications document). Based on these measurements, we should be able to tell if this is the case or not.

[Nemesis]

Hello,

Thank for replay.

I will put number.

1) Yes, I checked the all channels and with fans is working well.

2) It is static DO signal. Actually it is a power for Linmot controller 24V normally 400mA. I want to use them as a switch.

3) It seems to be an overturned state. The voltage is about the same as supply voltage about 24V. I connected even four channels and I got the same results. I made another test. I connect direct power supply of 24V to controller with a fuser 400mA and it did not break it. It means that I do not need more than 400mA current and addition the pick is too fast for the fuser in order to break it.

4) yes, I see the response of the led.

I tried with the additional resistor 10K like it was explained in one of the issues but it does not work neither.

The power supplied does not allow to get more voltage than 24 V. T