www.velocitydetection.com Doc: GLT-313-7-1 Issue: 001 Date: 28/10/2020
10) Earthing
The unit has both internal & external earth terminals, (see fig 3).
Internal earthing connections should be made to the internal earth
terminal on the PCBA, (please see fig 5 for AC, fig 8 for DC). The
earth conductor should be at least equal in size and rating to the
incoming power conductors. The internal earth bonding wire
connects the PCBA earth terminal to the internal earth terminal in
the enclosure back box.
External earth connections should be made to the M5 earth stud,
using a ring crimp terminal to secure the earth conductor to the
earth stud. The external earth conductor should be at least 4mm2 in
size. The external earth crimp ring should be located between the
two M5 plain washers provided and securely locked down with the
M5 spring washer and M5 nut.
11) End Of Line Monitoring (DC Units Only)
On D2xC1 DC units, dc reverse line monitoring can be used if
required. All DC units have a blocking diode fitted in their supply
input lines. An end of line monitoring resistor can be connected
across the +ve and
–
ve terminals. If an end of line resistor is used it
must have the following values:-
24V DC Alarm Horn and Strobe
Minimum Resistance 3k9 ohms Minimum wattage 0.5W
Minimum Resistance 1k ohms Minimum wattage 2.0W
Tone Selection (overleaf)
VL-D2xC1X05 Explosion Proof Horn Alarm & Strobe
