Can NI 9474 or NI 9237 with NI cDAQ-9172 be used to control motor pumps?

[balsur]

Hi,

I am using cDAQ-9172 as the data aquisition system and I am planning to control a motor pump to run fluids, can modules NI 9474 or NI 9237 be used to control the pump?  I know that NI 9505 which is a full H-bridge brushed DC Servo Drive Module which can be used to control pumps is not compatible with the cDAQ system.  I am very new to this, please help me with it.

Thanks

[Ima U]

Hi Balsur,

From my understanding you are using NI 9172 CompactDAQ chassis (cDAQ).  It sounds like you need advice on which cDAQ module you can use to control your motor.  You are correct that the NI 9505 can not be used in the cDAQ chassis.

The NI 9237 is a wheatstone bridge module.  It is used for low current, small voltage applications.  It is commonly used with strain gauges.  It is not meant to drive a motor.  The only output is the current excitation which would be insufficient to control a motor.

The NI 9474 is a C Series 8-channel, 1 µs high-speed sourcing digital output module. It works in any NI CompactDAQ or CompactRIO chassis. Each channel is compatible with 5 to 30 V signals and features transient overvoltage protection of 2,300 Vrms between the output channels and earth ground. The NI 9474 module is a correlated digital module which means it can perform correlated operations, triggering, and synchronization when installed in an NI CompactDAQ chassis.  Depending on what type of signal you require to drive your motor this could be an option.

I can point you in the right direction if you answer the following questions.

1.  What type of motor do you want to control?

2.  What type of signal do you need to control the motor?

[balsur]

Hi Ima,

Thanks for the reply.

The pump I am using is a motor driven micro diaphram liquid pump, and it can be run by DC (Direct current) upto a maximum voltage of 6V.

Please let me know if you need any other information.

Thanks

[Ima U]

Hi Balsur,

From my understanding the signal necessary to control your motor is 0-6VDC.  According to the output characteristics on page 17 of the  cDAQ 9474 specifications guide the 9474 is capable of supplying 5-30VDC.  If you need voltages between 0-4VDC then the NI 9474 is not a good candidate.  Do you already own an NI 9474?

If you have special requirements for motor control then you should look at NI motion products.

[Marse]

Hello,

I have also a NI cDAQ-9172 data aquisition system, with  NI 9435 ; NI 9237 and NI 9949 modules, and I want to control two motors with cell force.

On what I must be carrefull, and what are the basic conection betwen all the modules?

Thank you for the time.

[Jochen]

Marse,

a DAQ board that is used with a non-deterministic operating system like Windows XP is in general not a good fit for a control application. I have discussed this topic multiple times in this forum (e.g. here, and here). Additionally a USB based device is even less suitable for control applications than a plugin board.

Regards,

Jochen Klier
National Instruments