Wisp II 鈥?Speed control for DC fans
martFan Wisp II
is designed
to control small DC fans. The
low voltage version includes a
temperature alarm for increased safety. The high
voltage version accepts a 38 to 75 VDC
supply voltage range and includes a voltage
limiter set to 50 VDC.
Wisp II includes both a temperature sensor
and control circuit packaged in a probe for conve-
nient remote or on-fan mounting. The controller
uses a linear operating principle, applying a smooth
DC voltage to the fans. It is available for both
Closed-Loop (temperature regulating) and Open-
Loop (temperature compensating) applications.
S
The Wisp II controller鈥檚 power rating is sufficient
to control up to three typical 120 mm fans. The
low voltage version can be used with 12 or 24
VDC fans. The high voltage version is used with
48 VDC fans.
For additional information see:
page 13 Design Considerations
FEATURES
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Noise reduction typically 15 dB(A) at idle speed
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Completely self contained including sensor
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Controls 12, 24 and 48 VDC fans
2.00 in.
(50.8mm)
0.5 in.
(12.7mm)
3.00 in.
(76.2mm)
Temperature
Sensor
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Low voltage version (018W1XXX) accepts a supply
voltage range of 11.5 to 30 VDC and includes a temp-
erature alarm output that can drive logic or a red LED
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High voltage version (048W0XXX) accepts a supply
voltage range of 38 to 75 VDC and includes a voltage
limiter set to 50 VDC
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70潞C maximum operating temperature
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Supplied with 15 inch (24 AWG) wires and
mounting clamp.
SPECIFICATIONS
Part Number
Type
1
Supply
Voltage Range
11.5 - 30 VDC
38 - 75
11.5 - 30
38 - 75
Maximum
Watts to Fans
2
20 Watts
20
3
20
20
3
Control
Temperature
35擄C
40
35
40
N/A
N/A
Full Speed / Idle Speed
Temperatures
N/A
N/A
35擄C/23擄C
35擄C/23擄C
018W135
018W140
048W035
048W040
018W135P
048W035P
1
2
Closed-Loop
Closed-Loop
Open-Loop
Open-Loop
Closed-Loop types are installed near equipment exhaust, Open-Loop types at equipment inlet.
Air temperature of 70擄C or less, air velocity of 200 ft/min or greater. See page 13 for derating above 70擄C.
3
Above 50 VDC supply, power is linearly derated, reaching 10 Watts at 75 VDC.
U.S. Patents 4,659,290, 4,722,699 and 5,364,026
CONTROL
RESOURCES
28
INCORPORATED
E-mail: sales@controlres.com
s
Web: www.controlres.com
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