Control Resources, Inc., WISP II Speed control for DC fans

CRI Catalog and Design Guide Section

View Wisp II DC Fan Speed Control Installation & Operation Manual in PDF

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Wisp II - Speed control for DC fans

SmartFan Wisp II is designed to control small
DC fans and includes both a temperature sensor
and control circuit packaged in a probe for convenient
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.

The controller's power rating is sufficient to control up to three typical 120 mm fans. A temperature alarm output is provided for increased safety.

Wisp II accepts an 11.5 to 30 VDC supply voltage range for controlling 12 and 24 VDC fans.

For Application and Design Information See:

Features

Noise reduction typically 15 dB(A) at idle speed
Completely self contained including sensor
Controls 12, 24 and 48 VDC fans
includes a temperature alarm output that can drive logic or a red LED.
Wisp II (018W1XXX) accepts a supply voltage range of 11.5 to 30 VDC
70ºC maximum operating temperature
Supplied with 15 inch (24 AWG) wires and mounting clamp.

Specifications

Model	Part Number	Type¹	Supply Voltage Range	Maximum Watts to Fans²	Control Temperature	Full Speed / Idle Speed Temperatures
Wisp II	018W135 018W140	Closed-Loop	11.5 – 30 VDC	20 Watts	35�C 40	N/A
Wisp II	018W135P	Open-Loop	11.5 – 30	20	N/A	35�C / 23�C

¹Closed-Loop types are installed near equipment exhaust, Open-Loop types at equipment inlet. ²Air temperature of 70�C or less, air velocity of 200 ft/min or greater. For derating above 70�C click here: derating.

U.S. Patents 4,659,290, 4,722,699 and 5,364,026

To view installation and operation instructions:

View Wisp II DC Fan Speed Control Installation & Operation Manual in PDF