PQR
Series Model D52
Page 10
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V2.1
Apply AC Power:
There is a Unit Status LED on the front of the PQR D52. This led is used to indicate system
diagnostics status, and Unit operational status.
When the PQR D52 is first connected to AC power (110VAC or 220 VAC), it will go
through a series of power on diagnostics. The status of these tests can be seen in the Status
LED located on the front panel. While the initial tests are being executed, (approximately
10 seconds long) the Red LED will be blinking. After the tests are completed, the LED will
turn off briefly, and then turn on steady.
The LED will blink for ten seconds, whenever there is a disturbance detected on any input,
or the serial port has been accessed.
As soon as the diagnostics have completed, the PQR D52 is on-line, and monitoring the Hot
and Neutral lines, the Temperature channel, and the Humidity Channel. The unit should be
left on-line testing for at least a 72 hour period.
Status LED
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