PWM-520 low voltage problems

Hi all.  I am having a problem with an FP-PWM-520 module and I'm hoping that someone can help.
I have a Fieldpoint system with two FP-PWM-520 modules in positions @7 and @8.  The two modules are powered by a dedicated 24V supply.  One module works properly but the second module does not output enough voltage to run our equipment (~4-6V per channel at 100% instead of ~24V).
I measured and got 23.96VDC across V and C.  I tried swapping the modules to see if it was a problem with the terminals but the problem moved with the module.
Is there a configuration setting that i missed or is the module toast?
Thanks,
Dave

Hi Janell.  Thanks for the reply.  Here are the clarifications you are looking for.
1. The power supply is connected to the V and C terminals at postion @7 in the Fieldpoint train.  The V and C terminals at position @7 are then jumpered to the V and C terminals at position @8.  As originally connected, the two PWM modules share the same power supply.  This power supply is used exclusively for the two PWM modules.
When I say that I swapped modules it means that I took the two modules and switched their position in the train (ie: the module that was at position @7 was moved to position @8 and the reverse was done with the other module).  When I swapped the modules, the low voltage outputs followed the module that I suspect has a problem.
2. I did try isolating the supply to each module.  The result was that one module worked properly and the other still put out the low voltages.
3. I will try this in the morning.  Is it possible that the PWM modules are interfering with each other?
Thanks,
Dave

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