Telecom Cooling
Custom Fan Speed Control Example

Custom Fan Speed Control – Telecom Cooling Application

Telecom Cooling Redesign Project using 48V 4-Wire Fans
The challenge of this telecom cooling application was to maintain maximum fan speed control performance over an input voltage range of -33 to -72 VDC. Dual “boost” regulators were designed to ensure that the fans could maintain full speed capability when the supply voltage dropped below 48V. Dual passive filters were added to meet EMI regulatory requirements. Fan speed control based on temperature was implemented using a PWM control algorithm.
CRI’s ISO 9001:2008 registered electronic design and manufacturing facilities have the capability to provide complete custom fan speed control design for telecom cooling applications from prototype to production.

Custom Fan Speed Control – Telecom Cooling Application

Telecom Cooling – Custom Fan Speed Control Specifications

• Supply Voltage: -33 to -72 VDC
• Fans: Four 48 VDC, 2.91A, 4-Wire Fans
• Dual “boost” regulators. Maximum peak fan current 7A per regulator, running fan current 5.5A per regulator at 75°C
• Fan Speed Control based on temperature from a remote thermistor
• Provides fan status based on monitoring fan tach pulses
• Open collector alarm outputs for fan failure and over temperature conditions
• Dual passive filters for EMI requirements

Additional Custom Fan Speed Control Designs
for Telecom Cooling Applications

Please contact us to discuss your custom telecom cooling application needs.

“SmartFan, the Standard in Telecom Cooling Design”

Let Control Resources help you with your custom
fan speed control design & telecom cooling requirements.
Contact our SmartFan design group today.

Call 978-486-4160 today or fill out our Contact Form.

Custom Fan Speed Control – Telecom Cooling Application
SmartFan Design Group