Gnd fan fail pwr – Sandia Aerospace SAFE 528 User Manual
Page 2
The SAFE528 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 SAFE528 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 SAFE528 should be protected by a 1.0 amp fuse or breaker.
2.5
C
ALIBRATION
No calibration of the SAFE528 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
C
ONTINUED
A
IRWORTHINESS
Maintenence of the SAFE528 is on condition only. No scheduled maintenance is required
2.0
INSTALLATION PROCEDURES
2.1
G
ENERAL
The SAFE528 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 SAFE528 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
E
QUIPMENT
R
EQUIRED
2.2.1
Supplied
SAFE528 System
705722-00
Includes:
SAFE528 Fan
305722-00
Installation Kit
305477-00
Mating Connector
305479-03
Mating Pins
305478
2.2.2
R
EQUIRED
BUT
NOT
SUPPLIED
Three (3) or six (6) Number 6-32, 8-32 or equivalent mounting screws depending on mounting.
2.3
M
OUNTING
The SAFE528 mounts with three (3) or six (6) 6-32 or 8-32 or equivalent machine screws depending on mounting.
2.4
E
LECTRICAL
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Mating Connector and Contact Information
DO NOT BLOCK AIRFLOW INLET
Gnd
Fan
Fail
Pwr
SANDIA aerospace
Albuquerque, NM 87109
www.sandia.aero
1.3.3
C
ERTIFICATION
FAA-PMA
DO 160D
[F1]BAA[S2R2U(F,B2,M)]XXXXXXZBAZA[XX]M[XXXX][XX]XX
305738-00
Rev. B 10/8/12
ECN 3932
Beechcraft A36