Page 4 Copyright © 1995-97 Detection Systems, Inc. DS1520/30 Installation Instructions
• Drill out these three holes with a # 29 drill bit in a high speed drill.
- Drill the holes at least 1/4 inch deep.
• Thread these three holes with a 8/32 tap.
- Use a little oil to lubricate the tap while threading the hole.
- After threading the holes, use a 1/2 inch drill bit in a high speed drill to
smooth the surface around the holes and to remove burrs.
• Mount the detector to the surface using the three 8/32 screws provided.
• If a VS A14 Test Transmitter is to be used, it may be installed in the
detector’s right-hand bottom corner at this time.
6.1
Indirect Mounting of the DS1520/DS1530 to
Steel
In some installations, indirect mounting of the detector is recommended:
• Use the VS A4 mounting plate when welding to steel.
• Use the VS A6 for Day/Night applications.
• Use the VS A7 when keyhole protection is required.
6.1.1 Indirect Mounting to Steel Using the VS A4
• Clean the mounting area of any paint or other surface finish.
• Place the VS A4 on the mounting surface.
- Make sure it can not move during the welding process.
• Weld the VS A4 to the mounting surface.
- First weld points A, B, C, and D (see the following figure).
• Next weld the areas marked E and F (see the following figure).
A
B
C
D
E
F
Welding Points
• Mount the DS1520/DS1530 to the VS A4 using the three screws provid-
ed.
6.1.2 Using the VS A6 Moveable Mounting Kit
The VS A6 is designed to enable Day and Night mounting locations for
the DS1520/DS1530 on vault, safe, and cabinet doors. In the Day
position, the tamper switch is open, preventing the system from being
armed. In the Night position, the detector is fully functional.
The kit includes the following:
- A magnetized mounting plate, to adhere to two smaller plates.
- The two smaller plates. These two plates are called the Day (unarmed
position) and Night (armed) plates. The magnet ensures an efficient
signal transmission between the Night plate and the detector.
• The cable for the installation should be wired through the VS A10 Junc-
tion Box.
• Mount the Junction Box and Day plate together on the side of the safe/
vault or a nearby wall so that cable will prevent the safe/vault door from
opening when the detector is moved to the Night plate.
• Mount the Night plate near the keyhole or dial of the door.
- Be careful when drilling into safe/vault doors. Some doors may have
printed circuit boards pre-installed behind the outer steel plate for drill
protection.
- Mounting the Night plate: remove paint or other surface finish on the
mounting surface to guarantee proper connection.
• The Moveable Mounting Plate contains a reed switch and a microswitch.
Both determine whether or not the detector is properly in place.
- Wire these switches in series with the alarm relay of the detector.
- Only when the detector is on the Night position plate, and the alarm
relay is not in alarm, will it be possible to arm.
• Mounting:
- See the diagrams below.
Night Plate Pin
Day Plate
Mount the Night and Day plates to the mounting surface
with the bolts provided.
1
2
3
4
5
6
7
8
+
G max
G min
1
2
3
4
5
G ref
Mount the Detector to the moveable plate
with the bolts provided.
- Define the location of the Night position plate (Night position plate has
the small pin in the lower right-hand corner).
- Mark the three mounting holes. Prepare to drill and tap the holes.
- Drill out these three holes with a # 29 (3.3mm) drill bit in a high speed
drill. Drill the holes at least 1/4 inch (7mm) deep.
- Thread these three holes with a 8/32 (M4) tap. Use a little oil to lubri-
cate the tap while going through the hole. After threading the holes,
use a 1/2 inch (12mm) drill bit or countersink in a high speed drill to
smooth the surface around the holes and to remove burrs.
- Mount the Night plate with the three bolts provided.
- Define the location of the Day position plate. Use the three screws and
anchors provided.
- Mount the detector to the moveable mounting plate.
6.1.3 Using the VS A7 Keyhole Protection Kit
The VS A7 is designed to cover the keyhole with a hardened steel lever
when in the Night (armed) position. This will stop an intruder from using
plasticine explosives on the keyhole.
• Mounting
B
B
C
A
B
D
E
A= Bolt to open the VS A7
B= Mounting Holes
C= Wire channel for the microswitch
D= Release Lever
E= Keyhole protection lever
