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Electronic Theatre Controls Inc

EBDK Contact Output Confusion

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The information in this post is provided to assist in troubleshooting. Perform work at your own risk. ENSURE ANY POWER FROM DEVICES HAS BEEN DISCONNECTED BEFORE SERVICING ANY EQUIPMENT. If you do not feel comfortable performing the work, please contact us or your local service center. Be aware that ETC and its Affiliates are not responsible for any damage or injury caused by service of our products by anyone other than us or our authorized service providers, and such damage is excluded from the product’s warranty.

Description of Issue

Between June 14th, 2021 and October 15th, 2021 ETC shipped Emergency Bypass Detection Kit (EBDK) units with a REV D terminal label that incorrectly reversed the nomenclature for normally open (NO) and normally closed (NC). The wiring within the EBDK remained the same.

Correct (Revision C) Incorrect (Revision D)
LabelRevC.png LabelRevD.png

The REV D output 1-3 label on the EBDK does not correctly indicate the Normally Open (NO) and Normally Closed (NC) contacts of the relays on the PCB. NO is actually NC and NC is actually NO. In summary, when you see NO on the label this is actually NC and vice versa.

This is the wire harness that connects the PCB to the terminal blocks:

Here is the detail of where each wire terminates to the terminal blocks (correct REV C label shown):

Fix/Solution

Temporary Solution for Units with Revision D Label:

  1. Wire the contact labeled NO on the EBDK terminal label to the NC input of the device receiving the contact closure
  2. Wire the contact labeled NC on the EBDK terminal label to the NO input of the device receiving the contact closure

Permanent Solution for Units with Revision D Label:

In October 2021, the Rev E label was finalized with the following wording:

Rev E edited.jpg

  1. Wire the contact labeled "Open in Emergency" on the EBDK terminal label to the Normally Closed (NC) input of the device receiving the contact closure
  2. Wire the contact labeled "Closed in Emergency" on the EBDK terminal label to the Normally Open (NO) input of the device receiving the contact closure

If you are running into this issue, please contact ETC Technical Services with the serial number of your EBDK to request that a revision E 7183A4015 Label be sent to you to replace the incorrect revision D label.