How to Use the Alarm Test Switch on the D185

[#1]

Issue

What is the blue switch for on the D185 (Reversing PolaritySignaling Module)?

Solution

The blue switch on the D185 is an alarm test switch. This switch disables the module's output during testing, resulting in a trouble output from the module during the test period. This switch is normally OFF. Move the switch to the ON position during an alarm test. Turning on the alarm test switch lights the alarm test LED.