PacAce wrote in post #11682874
Just out of curiosity, why must a single head be only used at full power? What's going to happen if it's accidentally set to "120"?
Not a reduced power setting on the power pack, but a reduced power setting on the flash head.
The heads mitigate power in a relative crude manner, they just dump energy into a resistor. This resistor is wired parallel to the flash tube and that switch on the back just deals the resistors into and out of the electrical mix. The resistors and the flash tube compete and share this power.
These resistors are marginal for the purpose as there is a lot of energy to dissipate, and they need to fit in that flash head.
If you only have one flash head, and set the flash head at a reduced light output. Too much power has to be dissipated in that resistor.
But, if you have more than one head it reduces the power the resistor has to deal with.
Remember with more than one head, the power from the pack is shared with all the flash heads.
In this case, the Novatron 240 Ws pack is relatively low powered (compared to other Novatron packs), so it is likely things would be fine.
But that is a general warning included in the Novatron use manuals. Which is basically what the OP was asking about.
Buy the way, I had a good hunch you were going to ask this followup after I completed my initial reply. Possibly I have been hanging out here too long. Either that or I need to start another agitated, cigar smoking woodpecker thread.
The power pack reduces power by switching more or fewer power capacitors into the mix. The Novatron 240 likely only has two power capacitors.