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Electronic Theatre Controls Inc

Sensor IQ Breakers Are Lagging After Switching On and Off Repeatedly


I was trying to switch my Sensor IQ breakers on and off repeatedly in a short amount of time, but then they slowed down and won't respond to control for 10-15 seconds.

Explanation of Issue

This is a feature built into the Sensor IQ panels to protect the breakers, which have a maximum frequency of operation to allow the relay solenoid to cool safely. If the relays are flipped on and off repeatedly too quickly, it can cause them to overheat. This maximum rate is defined in terms of transitions. A transition is one change, from off to on, or from on to off state.

The logic is as follows: the relay may be transitioned 10 times in 30 seconds. If that rate has been exceeded the breaker goes into a cooldown period for the rest of the 30 seconds. During cooldown no further transitions are allowed, and the cooldown state is reported as an error on the Echo UI. Once the 30 seconds has elapsed, the breaker is allowed to switch again and the process repeats.

This functionality is done on a per breaker basis, so there's no risk of temporarily locking up an entire rack because control of one relay is chatty.

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