Dimmers @ Full on 1% - 48X2.4k Sensor Touring Rack

Have you check if that dimmer range is set to 'non-dim' or 'switched'? Those would both give you full at 1%

I had checked that as well.  Upon re-inspection, all dimmers are currently set to normal.

When you set rack type, what options do you get? Do you get SP24, SP36, SP48 and SP96? If you have and option that is SP96 then you need to set the rack to be SP48. 

This changed in the CEM software at some point but I do not remember which version did what. 2.14 or 3.1

When you set rack type, what options do you get? Do you get SP24, SP36, SP48 and SP96? If you have and option that is SP96 then you need to set the rack to be SP48. 

This changed in the CEM software at some point but I do not remember which version did what. 2.14 or 3.1

The Model NO of the rack is SP4820 so the setting I would need is SP24.  In one rack, I have 24 total D20 Dimmer Modules each with 2 individual dimmers.  I've cross-referenced this with the two other 48ch racks that I have on the show and they both read out as SP24.  Both of the other racks are also functioning perfect.

I'm not sure what software version the CEM is.  When I have a chance I will check.

Thanks.

It would be nice to know the software version but it seems you have the rack set correctly.

• 1. Did the rack work correctly when you first started using it or is it just today that this problem started?
• 2. Are dimmers 1-24 and 41 to 48 working correctly?
• 3. Are you in Europe and/or are you running this rack at 240V? (Americans do not usually talk about L1 and L2)
• 4. Does the rack have a 120/240 switch on the back?
• 5. Did you rent this rack?

Sorry to jump around on you but having an issue with dimmers 25 to 40 is very odd as none of the internals match to that range. There is one very old issue (Mr. North remembers these things) with an old touring rack sold to Production Arts and sent to Europe that had an issue kind of like this and we do not know if it ever got fixed. I'd find it hard to believe that that rack would have been around this long with that problem but stranger things have happened.

I've encountered a similar issue with my SP24, when I had a different CEM in there set to SR24 not SP24, it would kick different dimmers to full at 1%...  A quick generate defaults fixed that for me.

We're based out of San Diego, CA.  As far as I'm aware, this is the only time that the issue has come up.  We own four of these racks, two of which we acquired about a year ago.  The rack I'm currently having an issue with is one of our older racks.  The two newer racks are configured with some 10/5 services, so we've been requesting them over the older racks.  So it's a very big possibility that this is an old issue that has been dormant for a while.

Dimmers 1-24 and 41-48 are working properly.  None of our racks have a 120/240 switch.  We always run 208V.

No worries about the jumping around.  I'm just perplexed with this.  Ha ha.

That's what I thought it could have been.  I swapped the CEM three different times just to triple confirm.  So I'm pretty sure the issue is not in the CEM.

Ok, this is all good information.  Sorry I haven't responded sooner....been on an airplane.

Power down and disconnect the rack and pull out the dimmer modules.  Verify on the feed wiring on the left side of module slots that L1 goes to the phase bar for 1-8 and 25-32, L2 goes to 9-16 and 33-40, and L3 goes to 17-24 and 41-48.  If the feed wires are swapped for 25-32 and 33-40, then this would be the problem.

Let me know,

David

Thanks David.  I spoke with someone at my shop a few minutes before you responded.  Apparently another tech was unsatisfied with how the socapex out was oriented on the rack and decided to tear the rack apart and rotate them.  So, it sounds like that's the root of the issue.  I'll confirm later on tonight once we can power down. 

Thanks again everyone.  I appreciate the quick responses.