188.8.131.52 Continuous Self-Test
The AFE3010 performs the following continuous mode self-tests. If any of these tests fail, the device does not wait to perform another self-test. Rather, the AFE3010 immediately fires the SCR and sets the ALARM blinking as 1-s intervals (for 60-Hz systems).
- Open Solenoid Test: The AFE3010 checks for transition of AC line signal at the PH and SCR_TST pins. If the device does not detect a transition of the line signal at PH or SCR_TST pins for approximately 100 ms, then the device reads a self-test fail.
- Diode Bridge Test: if a diode is shorted in the diode bridge rectifier, the device is able to detect the variation in supply current from the diode bridge. This detection is considered a self-test fail, and the AFE3010 fires the SCR and sets the ALARM blinking at 1-s intervals (for 60-Hz systems).
- Amplifier Short/ Open: The device monitors for sustained fault current conditions, even after the fault current has been detected and SCR has fired. The primary purpose of this self-test is to detect a single-point failure with the amplifier signal pins and associated components. If a failure is detected, the device fires SCR one more time and LED starts blinking. In the event the load switch doesn't open after SCR is fired, this self-test recognizes a failure and starts the LED blinking.
Figure 10. AFE3010 Self-test Sequence