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
G
ENERAL
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
E
QUIPMENT
R
EQUIRED
2.2.1
Supplied
SAFE 328 System Includes:
SAFE 328 Fan
305467-00
Installation Kit
305477-00
Mating Connector
305479-03
Mating Pins
305478
2.2.1
R
EQUIRED
BUT
NOT
SUPPLIED
Three (3) Number 6-32, 8-32 or equivalent mounting screws
2.3
M
OUNTING
The SAFE 328 mounts with three (3) number 6-32 or 8-32 or equivalent machine screws.
2.4
E
LECTRICAL
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.
D
O
N
OT
B
LOCK
A
IRFLOW
I
NLET
305467-00-IS
Rev. D 06/25-13
ECN 3987
