If your LFO Device is #1 in the DSP chain, then you can use the pattern command: 1600
See the official docs for more info on the meta devices:
http://tutorials.renoise.com/Renoise/MetaDevices
Also see this previous thread for more handy LFO info:
https://forum.renoise.com/t/sync-lfo-start-to-pattern-start/19773
.