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Vaisala Surge Protector
WSP150
–
Superior 3-stage surge protection tolerating
10 kA surge currents
–
Both differential and common mode
protection on each channel
–
Filtering against HF and RF noise
–
Two power channels (±43 V, 1.5 A) and two
data channels (±13 V, 0.16 A)
–
Can be used with all Vaisala wind and weather
instruments
–
Adjustable mounting clamp provided for pole
masts, Ø 30 mm … 102 mm
–
Two extra cable glands for cable branching
and chaining
DESCRIPTION
Vaisala Surge Protector WSP150 is a compact-size transient
overvoltage suppressor designed for outdoor use. It can be used
with Vaisala wind and weather instruments for protection against
surges entering through the line cables. For example, a nearby
lightning strike may induce high-voltage surge not tolerable by
the integral surge suppressors of the instrument. Additional
protection is thus needed in regions with severe thunderstorms,
especially when long line cables (> 30 m) are used.
Vaisala recommends using the surge protector in installations on
top of high buildings or masts and in sites on open grounds, and
in all sites with an elevated risk of a lightning strike. WSP150
also provides an additional filter for blocking the HF and RF
interference induced into the cables in installations to, for
example, radio transmitter masts, and power line carrier towers.
WSP150 has four channels, two dedicated for power lines and
two for data lines. Each channel uses a 3-stage protection
scheme with gas discharge tubes, voltage-dependent resistors,
and transient zener diodes. Both differential and common mode
protection is provided for each channel: across the wire pair,
against the operating voltage ground, and against earth.
WSP150 has a weather-proof IP66 plastic housing with metal
reinforcement, mountable to Ø 30 mm … 102 mm pole masts
with an adjustable mounting clamp (provided). Four cable glands
are provided, two of which serve for cable branching and
chaining, for example, in tower installations when common data
and power lines are shared by several devices.
Line cable
Device cable,
max. 3 meters
Data
Aqcuisition
System
Earth
1106-028
Figure 1 Operation Principle
CAUTION
Make sure the device cable is short to
minimize surge induction to the cable.
Earthing (grounding) of the unit must be
done either through the mast or with
a 16 mm
2
(AWG 5) copper wire from the
earthing screw to true earth (lightning
ground).
INSTALLATION
0611-027
Figure 2 Installing WSP150 to Pole Mast
Disconnect all live voltages and follow the procedure below:
1.
Attach the unit to the mast close to the protected device
with the adjustable mounting clamp, see Figure 2. Set the
steel strip beneath the latch at the back of the enclosure.
2.
Fix the steel strip around the pole mast. You may shorten
the strip to a suitable length. Attach the strip ends to the
fastener and secure the unit to the mast by tightening the
fastener's screw.
3.
Open the 4 plastic screws and remove the unit cover.
4.
Enter the line cable through the left side cable gland and
make the wiring to the line terminals, as shown in
Figures 3-6. For best shielding from RF noise, follow the
instructions in Figure 8. Carefully tighten the line cable
gland.
5.
Enter the device cable through the right side cable gland
and make the wiring to the device terminals, as shown in
Figures 3-6. Carefully tighten the device cable gland.
6.
Carefully reattach the unit cover with the plastic screws.
7.
If the mast (or its surface or base) is poorly conductive,
use an earthing wire. Connect the wire end to the crimp
connector provided in the plastic bag. Fix the connector
with the M5 nut and washer to the earthing screw at the
enclosure's rear upper left corner. See also Figure 7 and
the CAUTION.
© Vaisala 2011. All rights reserved.
*M210809EN*
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