10-07-2008 10:15 AM
The documentation for the cFP-PWM-520 says that there are 8 outputs which can be supplied with 5, 12, or 24 VDC and that each put out a max of 1 A per channel. Will it work if I supply the module with 12 VDC and 8 A?
I'm worried I might burn out the module.
10-07-2008 11:28 AM
Gizmaa:
You should be OK. Using a supply rated at 8A, you have the ability to provide the 8 PWM outputs at full load all at once. The load will determine how much current is drawn from each channel. What type of loads do you have, out of curiosity?
-AK2DM
10-07-2008 11:48 AM
10-07-2008 12:09 PM
Gizmaa:
I would highly advise not to parallel multiple outputs to drive loads needing more than 1A. Some of NI's devices have this capability, but I did not see any mention of this in 520 manual. Hopefully someone with knowledge or experience with the 520 can verify this.
You could probably use a power transistor or MOSFET with the appropriate protection circuitry (since a blower motor is an inductive device capable of generating back EMF) that is driven by 1 channel of the 520 to allow high current operation for your load.
-AK2DM
10-08-2008 12:51 PM
Gizmaa,
I would also not advise connecting multiple PWM channels in parallel. If you do want to experiment with any connections right now, I strongly advise putting a fuse in series with your power supply and load as shown in Figure 3 of the Operating Instructions Manual.
Kevin S.
Applications Engineer
National Instruments
10-08-2008 01:17 PM