I have a 24 VDC sensor that connects to a switching amplifier. When the sensor detects a fault it should send a signal to a relay which is connected to a green LED and a red LED. The Green LED should be on all the time unless there is a fault sensed by the sensor. If there is a fault the red LED should come on and the green one should turn off. Is it possible to do this with just one relay? And how would the wiring schematic go? The input voltage is 120 VAC. The switching amp connects to the sensor on one side through an intrinsically safe barrier.
Electrical – Can 1 relay turn one light off and another on
ledrelay
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Best Answer
simulate this circuit – Schematic created using CircuitLab
Figure 1. Indicator relay schematic.
How it works:
I've shown resistors on the LEDs as a reminder that current limiting is required. It's not clear why you might want to use 120 V AC for the LEDs. If you do then you need 120 V AC LED indicators with built in diodes and resistors.