SANDIA aerospace SAFE 328 User manual

SAFE 328
Avionics Cooling Fan
With Fault Detection INSTALLATION INSTRUCTIONS
SANDIA aerospace
Albuquerque, New Mexico
www.sandia.aero
305467-00-IS
Rev.D06/25-13
ECN 3987
1.0 INTRODUCTION
This sheet describes the installation of the SAFE 328 Blower with fault detection output. It is intended for use
by FAAcertified repair stations to install the SAFE 328 and includes both mechanical and electrical installation
information. The installer should insure that the SAFE 328 is operating according to its intended function.
1.1 PRODUCT DESCRIPTION
The SAFE 328 is an avionics cooling fan that provides an operating indication. When the fan is normally
operating, this output is at low impedance. The output goes to high impedance whenever the RPM of the
motor drops below a preset threshold, signaling the connected avionics of the reduction in cooling from the
SAFE 328.
1.2 TECHNICAL CHARACTERISTICS
1.2.1 PHYSICAL CHARACTERISTICS
Width 1.25” Height 4.75”
Depth 5.58” Weight 0.7 lb
Figure 1
Dimensional Drawing
1.2.2 OPERATIONAL CHARACTERISTICS
Operating Voltage 22-31Vdc
Current Operating .400Amps Nominal
Start-up .550 Amps
Air Flow (All Ports) 20 CFM No Static Pressure (10CFM @ .08 H2O Static Pressure)
Operating Temp -20 to +55 oC
Max Operating Altitude 55,000 Feet
1.2.3 CERTIFICATION
FAA-PMA PQ0894SW Diamond DA40
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SANDIA aerospace
Albuquerque, New Mexico
www.sandia.aero
The SAFE 328 operates on 28Vdc. It will provide a low on the Fan Fail pin (center pin) of the connector
when operating normally. When airflow drops to 65% of nominal, as determined by fan RPM, the Fan Fail pin
will output a high. An external pull-up is required. Power to SAFE 328 can be supplied from the aircraft buss
or from the unit to be cooled if an ouput is available. If connected to the aircraft buss, the SAFE 328 should be
protected by a 1.0 amp fuse or breaker.
2.0 INSTALLATION PROCEDURES
2.1 GENERAL
The SAFE 328 is supplied with a mounting connector and four contacts. Only three contacts are required and
the spare one is provided in case one is destroyed during installation. The SAFE 328 is mounted with three (3)
number 6 or 8 screws. Cooling air is ducted to the device to be cooled using aircraft approved tubing. Unused
ports should be capped.
2.2 EQUIPMENT REQUIRED
2.2.1 Supplied
SAFE 328 System Includes:
SAFE 328 Fan 305467-00
InstallationKit 305477-00
Mating Connector 305479-03
Mating Pins 305478
2.2.1 REQUIRED BUT NOT SUPPLIED
Three (3) Number 6-32, 8-32 or equivalent mounting screws
2.3 MOUNTING
The SAFE 328 mounts with three (3) number 6-32 or 8-32 or equivalent machine screws.
2.4 ELECTRICAL
Caution
SAFE 328 Units S/N’s 10001 and above May Not Properly Indicate
“Fan Fail” If The Fan Is Stopped Completely. Consequently, Consid-
eration Should Be Given To Preventing Foreign Objects That Could
Stop The Rotation From Entering The Fan.
DONOT BLOCKAIRFLOW INLET
305467-00-IS
Rev.D06/25-13
ECN 3987

2.5 CALIBRATION
No calibration of the SAFE 328 is required. The unit is tested by slowing the fan manually and observing a
high on the Fan Fail pin . Allow the fan to return to normal speed and observe a low on the Fan Fail pin.
2.6 CONTINUED AIRWORTHINESS
Maintenence of the SAFE 328 is on condition only. No scheduled maintenance is required.
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SANDIA aerospace
Albuquerque, New Mexico
www.sandia.aero
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305467-00-IS
Rev.D06/25-13
ECN 3987