1. Wires only present on versions with output signals.
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For more information, please visit the
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CUI Inc
│
SERIES:
CFM-40
│
DESCRIPTION:
DC AXIAL FAN
date
07/27/2017
│
page
4 of 5
APPLICATION NOTES
Auto Restart Protection/Current Limit Protection
When the fan motor is locked, the device will cut off the drive current within two to six seconds and restart automatically
after a few seconds. If the lock situation is continued, the device will work on a repeated cycle of cut-off and restart until
the lock is released. (See Figure 1 below).
Figure 1 Current Limit Protection
Pulse Sensor/Tachometer Signal/FG
Pulse Sensor is for detecting the rotational speed of the fan motor. At locked rotor condition, the signal stops cycling and
the output is fixed at VoH or VoL
(See Figures 2~3 below).
Figure 2 Output Waveform
Figure 3 FG Signal Output Circuit:
Open Collector
Ic=10mA max
PMW Control Signal
A speed control lead can be provided that will accept a PWM signal from the customer circuit to vary the speed of the fan.
The change in speed is linear by changing the Duty-Cycle of the PWM. Open collector type and pull-up voltage is changed
by maximum operating voltage and sink current by consuming current. (See Figure 4 below).
Figure 4 Duty Cycle
Vs=4~5 V
cui.com
For more information, please visit the
product page.
CUI Inc
│
SERIES:
CFM-40
│
DESCRIPTION:
DC AXIAL FAN
date
07/27/2017
│
page
5 of 5
REVISION HISTORY
rev.
1.0
1.01
description
initial release
updated datasheet
date
08/15/2016
07/27/2017
The revision history provided is for informational purposes only and is believed to be accurate.
Headquarters
20050 SW 112th Ave.
Tualatin, OR 97062
800.275.4899
CUI offers a one (1) year limited warranty. Complete warranty information is listed on our website.
Fax 503.612.2383
cui.com
techsupport@cui.com
CUI reserves the right to make changes to the product at any time without notice. Information provided by CUI is believed to be accurate and reliable. However, no responsibility is
assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use.
CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical
component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to
