www.velocitydetection.com Doc: GLT-313-7-1 Issue: 001 Date: 28/10/2020
9) DC Wiring
9.1 DC Stage Polarity Control
The stage switches of the DC powered D2x units can be activated via
Positive (+ve) or Negative (-ve) switching. All units are factory set to
-ve switching as standard. If +ve switching is required, the two wire
links should be removed from the ‘
-
’ positions of the stage polarity
control terminals and fitted to the ‘+‘ positions as shown in fig 6.
Fig. 7c DC Simplified Block Diagram (negative switching, powering
sounder and beacon independently)
9.3 Units First Stage Tones
Stage one (S1) operation: Simply connect the supply voltage to the +
and - supply terminals, (see fig. 8). The Strobe is powered via factory
installed wires connected to the alarm horn. The wires connecting
the alarm horn and strobe can be removed if the user wishes to
power the strobe separately.
9.4 Second, Third and Fourth Stage Tone Selection
For units set up for
–
ve switching (default setting):
Stage two (S2) operation: Power +ve and
–
ve, link a -ve supply line
to the S2 terminal.
Stage three (S3) operation: Power +ve and
–
ve, link a -ve supply line
to the S3 terminal.
Stage four (S4) operation: Power +ve and
–
ve, link a -ve supply line
to both the S2 & S3 terminals.
Strobe will continue to flash during alarm horn S2, S3 & S4 stages.
For units set up for +ve switching (refer to 9.1):
Stage two (S2) operation: Power +ve and
–
ve, link a +ve supply line
to the S2 terminal.
Stage three (S3) operation: Power +ve and
–
ve, link a +ve supply line
to the S3 terminal.
Stage four (S4) operation: Power +ve and
–
ve, link a +ve supply line
to both the S2 & S3 terminals.
Strobe will continue to flash during alarm horn S2, S3 & S4 stages.
Fig 8 DC Terminals (overleaf)
VL-D2xC1X05 Explosion Proof Horn Alarm & Strobe
