How do I vary the voltage of a DC power source in a sine pattern around a certain voltage?

Hello all! I'm using a GW Instek PST-3202 DC power supply to apply a voltage to a cartridge heater to heat an aluminum block. I want to apply a sine wave that varies the voltage by +0.05 V to -0.05 V centered around 15 V (from 14.95 V to 15.05 V). I can manually set the voltage of my power supply to 15 V using the analog controls on the power supply itself, but as soon as I turn on my VI it resets to 0 V, which I don't want. Also, it says there is a read timeout, and I'm not sure why. I'm very new to LabVIEW so this may be a very easy fix, but any input would be greatly appreciated! My VI is attached, as well as the VI I am using to monitor the temperature, just for completion.
Attachments:
temp_resolution.vi ‏21 KB
LabVIEWTempLogger_new.vi ‏83 KB

I've followed all of the advice ITT, but I'm still getting a timeout error on VISA Read. I added a wait between the write and read functions, as a tutorial told me I should, but I'm still having a problem. Also, I feel like the sine pattern function isn't creating a continuous sine pattern, but that may be because the VISA Read is timing out still. My VI is attached. I know I need to take a free tutorial, but I haven't had the time yet.
Attachments:
temp_resolution.vi ‏17 KB

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