From:
http://www.fireworks-forum.org.uk/threads/so-what-did-happen-to-vulcan s-display-in-montreal.20839/page-2 and re-posted without permission, this is the Galaxis take on the problems encountered in the Vulcan display:
The wireless firing system used in Montreal was a rental system from Galaxis Showtechnik GmbH, based in Germany.
The problem was caused solely by the fact that 17 of 54 firing modules were set to the wrong radio channel (i.e. frequency).
Before shipping the system to Montreal it was configured to the system ID of Vulcan and to a specific frequency that is normally used by Vulcan. This configuration was done by a Galaxis staff member.
After that all firing modules (receivers) have been programmed remotely with the cue numbers and step delays. Vulcan provided the script to Galaxis in order to do the programming of the devices before the shipment. This was a special service of Galaxis and the goal was to help the crew by saving some time on site. The same procedure was done for a Vulcan show in Oman some time ago and everybody was happy with this.
The programming was done by one of the owners of Galaxis. During the remote programming every programming step has to be acknowledged by the addressed firing module by sending a feedback command. This is possible because the system operates bi-directionally and the firing modules can send feedback information to the controller or the wireless USB modem which is connected to a computer. During the whole programming no errors occurred at all. Then all firing modules have been successfully switched off by remote commands on the correct radio frequency right before packing. So we are absolutely sure that the whole system was working on the correct frequency before it was shipped to Canada.
After firing the display the crew checked the receivers and found that one third of them was set to radio channel 0.
The system has been returned to Galaxis and has been thoroughly inspected by the freelance technician who was in charge for the system tests, another Vulcan crew member and Galaxis staff. The show was fired again in a dry run and all receivers on the correct radio frequency functioned properly. The receivers on the wrong radio channel did not fire. After setting all receivers to the correct channel all receivers fired perfectly in a second dry run. We took a video of this test and we compared the firing LEDs of the receivers with the firing script and found that all modules performed according to the script. This tells us that all receivers were programmed to the correct system ID and that the cue and step programming was fine.
During the setup of the display the crew checked continuity on all receivers always directly at the devices. They did not perform any remote checks until the show day. The show operator and freelance technician started to address some devices remotely at 8 p.m. on the show night. The devices responded until he reached one on the wrong radio channel. He did not receive any feedback and thought this is because of the long distance and obstacles in between. He continued to check other devices but stopped due to lack of time. Believing all the devices were set to the same channels as had been programmed by Galaxis it did not become apparent there were any major issues.
It is the normal procedure to test the firing modules remotely and Galaxis is strongly recommending to do so.
By performing remote data requests you can test the continuity of the firing lines but in addition you can conveniently obtain much more information about the status of the firing modules:
- charging level of the battery and battery power
- field strength of the signal received at the firing module
- field strength of the feedback signal
- interfering signal strength
- threshold of the resistance metering
- programmed hazard zone
- inner temperature
- information about the humidity in the device to be sure that the desiccant is working
- summary regarding the outputs (number of programmed outputs, number of programmed outputs with a resistance higher than the programmed maximum resistance, number of outputs with no cue programming but connected with an e-match)
- and some more to name just the most important parameters
If you go to the 'details' screen you will see:
- programmed cue numbers
- programmed step delays
- exact resistance of each firing line connected
If a certain parameter is not OK an exclamation mark is being displayed next to it.
By performing the remote access the communication path is being tested as well.
If the freelance technician had spent more time using the remote testing features of the system, which is his usual practice, the problem may have became apparent before the show.
Galaxis Showtechnik GmbH / Vulcan