DSP-50 User Manual
Page 16 of 27
DSP50_MAN_A
Indicators
The DSP-50 is equipped with three (3) LED indicators: Power (Green), Detect A (Red), and Detect B (Red).
Power LED –
The green power LED indicates these possible states:
Off
The voltage applied to the detector is less than the minimum display
voltage of approximately 5 volts. The LED will be off.
Reset in Fail-safe
At the start of a reset event (a DIP switch change, sensitivity change, or
power cycle) the LED will turn off for 500 milliseconds, on for 500
milliseconds, off for 500 milliseconds, off for 500 milliseconds, and then
display its normal state.
Reset in Fail-secure
At the start of a reset event (a DIP switch change, sensitivity change, or
power cycle) the LED will turn off for 500 milliseconds, on for 500
milliseconds, blink repeatedly with 50 milliseconds on followed by 50
milliseconds off for one second, and then display its normal state.
Open Loop
When the detector senses that the loop is open or the inductance is too
high, the LED will turn on for 500 milliseconds then off for 500
milliseconds repeatedly, for the duration of the fault. If the fault is
corrected the LED will display the Prior Fault indication.
Shorted Loop
When the detector senses that a loop is shorted or the inductance is too
low; the LED will turn on for 100 milliseconds then off for 100
milliseconds repeatedly, for the duration of the fault. If the fault is
corrected the LED will display the Prior Fault indication.
Large Change Fault
When the detector senses that a loop is experiencing a large inductance
change (greater than 30%), the LED will turn off for 100 milliseconds
then on for 100 milliseconds for 500 milliseconds then stay on for 500
milliseconds and repeat the sequence for the duration of the fault.
If the fault is corrected and the Fail Memory feature is enabled, the LED
will display the Prior Fault indication.
Prior Fault
The detector is equipped with the ability to remember prior faults that
have occurred since the last power interruption or reset (changing a DIP
switch or the sensitivity). The LED will turn on for 1850 milliseconds, off
for 50 milliseconds, on for 50 milliseconds, off for 50 milliseconds and
then repeat the sequence until power is cycled or the detector reset.
Normal
The LED is always on when the detector is in its normal state of
operation.
