Does UMI-7774 need power source?

[Maître]

This may seem like an obvious question, but I need to ask it anyway:

I am using the PCI-7334 and UMI-7774 to control my E-DC drive and step motor. Does the UMI needs any power? For now, the UMI is plugged to the PCI-7334 and the step motor and power source are plugged to the E-DC drive which is plugged to the UMI.

Please help me!!

Thanks

[Brian_Beal]

Yes, the manual states that you need at least one 24VDC power supply.

[Maître]

Can I use the same power source I am using for my step motor (24 VDC - 5 A output)?

[Brian_Beal]

I would not.  You should have an unregulated power source for the steppers, and a regulated source for the UMI.

[Maître]

What do you mean by regulated and unregulated?

[Brian_Beal]

A regulated power supply will hold its rated voltage.  An unregulated one will not.  Stepper drives typically don't get along with regulated power supplies because at start up there is a larger current draw.  The power supply may think this is a short-circuit and either foldback or trip.  Regulated supplies are also more expensive.