Clarification of TR20SAF ThruPower module configuration


I am an end-user hoping to get some clarification on the configuration of the TP20SAF, ThruPower, module preparatory to specifying a dimming system upgrade.  I had been working under the presumption that configuration of whether the module functioned as a relay or dimmer was selectable via configuration in the Concert software or the menu of the CEM3 unit.  However, if I understand correctly, it appears, from the CEM3 manual (v1.7.2), that the configuration can be altered live via DMX address levels.  The control options I see are TPAuto mode and TPDMX mode for determining how the live levels are used by the module.  TPAuto mode "Allows control of ThruPower behavior using one single DMX address, where full (DMX value 255) closes the relay and any other level is dimmed."  In this case what is to prevent someone from unknowingly dropping the DMX level below 255 and dimming the power to a non-dimmable load, such as a moving light or projector?  TPDMX mode "Allows control of ThruPower behavior using two DMX addresses", the first of which is the control address while the second sets the mode to either be a switched circuit or a dimmed circuit.  Again, what is to prevent someone from unknowingly changing this mode during normal operation?  So others can see, I've attached a screenshot showing a channel in Eos set to the ThroughPower Module TPDMX 16B profile. The top two images show the Switched Mode while the lower two show Dimmed Mode.  Is there a way to set the mode at a non-live level, as was my presumption, in order that others won't be able to accidently change the module's function?
Thanks for any info.
Steve Martin
  • So others can know, I just spoke with ETC Technical Services regarding this.  I was told that the ThruPower module can be configured via the Concert software to be in Switched mode to use its relay function.  It appears that the option to be in Swiched mode for the ThruPower module is not the same as being in Switched mode on a D20 dimmer module.  Switched mode with the ThruPower module activates the relay as opposed to the D20 in switched mode which still delivers power thru the SCR.  A couple of documents I read online said, regarding the D20, “It is important to remember that even in Switched or Non-Dim modes, when using a Phase Controlled Dimmer, the sine wave is not a pure sine wave” and “there will always be a modification to the voltage waveform as the dimmer turns on even if it is attempting to fire at full.”  I also read that “Instead of designing their fixtures to operate on dimmers that are set to full on, they (other manufacturers) void warranty if the fixture is powered by a dimmer set in switched mode.  In contrast, ETC's Selador series LED fixtures are designed to be capable of running on a dimmer in switched mode so, within the ETC family of LED products, no damage will be caused as long as the fixture is not powered at a dimmed state.”  I read further that “ETC recommends that loads such as LEDs, Moving Lights, and Motors be powered via a non-dimmable source such as a Relay or Constant Current Module, or a ThruPower Module set to Relay mode.”  As you can tell I was concerned that I would damage my non-ETC equipment if I ran the ThruPower in Switched mode.  Apparently this is not a problem since the power is delivered through the relay in Switched mode, not the SCR.

    Also I should mention that the model number I mentioned in my original post is incorrect.  The correct model number is TR20SAF.