DSP-19 User Manual
Page 12 of 24
DSP19_MAN_A
A fail-secure detector will not activate the output when the loop circuit is failed. This will keep the gate closed.
This is useful in high-security areas or installations where containment is needed.
The magnetometer mode is always fail-secure.
These failure modes only apply to the output when external power is applied. That is, the failure output is more
of a loop failure output than a total failure output. When placed in the fail-safe position, the main output will be
activated when the detector recognizes that the loop is somehow compromised, like if a loop wire is disconnected
from its terminal screw. If placed in the fail-secure position, the main output does not activate when a fault
condition is identified.
DIP
Switch 3
Failure Mode for Output A
OFF
Fail-Safe
Factory Default
ON
Fail-Secure
When a fault is identified the green Power LED will flash to indicate the type of fault that was found. See
Indicators
–
Power LED for more information on this display.
Output Connector
The DSP-19 connects as typical through its rear 9-pin connector. That is, loop inputs and power inputs. However,
the main output is through the 2-pin connector located on the top of the detector. The connector is a typical Euro
style screw terminal block. Looking straight on at the side label, the wires are inserted in the opposite side of the
connector and then torqued down with the appropriate screw. As the label denotes, the right-most screw is the
main output and the left-most screw the common.
Indicators
The DSP-19 is equipped with two (2) LED indicators: Power (Green) and Detect (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.
LOW VOLTAGE
The voltage applied to the detector is more than the minimum display voltage of
approximately 5 volts, but less than the minimum of 8 volts, the LED will be
blinking 250 ms on and 250 ms 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, 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
