Triangle waveform in OrCAD
This is supposed to be a triangle wave generator but it's all wrong- U1B should be an op-amp not a comparator- it's an integrator. Having V11 in there means that U1B cannot respond to U1A's output, it will just go 'open' (it's open collector). 

It might conceivably work if  you add a 3K pullup to +5 on the output of U1B, remove V11, and add a 10uF capacitor from the output to the negative rail (the latter is necessary because the comparator won't want to play nicely when you try to make it act like an op-amp- it is LM339/393-specific - don't try this with another random type of comparator).  

Better to try replacing the LM339 with a rail-to-rail CMOS op-amp. Be sure to follow the tutorials carefully to add the device if you can't find one in your PSPICE library, it's somewhat non-trivial.