ITW GSE 4400 Tier 4, Руководство пользователя, Страница: 109 / 126

Operation Manual – ITW GSE 4400 Tier 4
A.3 Safety Interlock
To ensure personnel health and safety, the converter is equipped with an interlock system. * The system
ensures that the output only stays engaged while the plug is inserted into the aircraft receptacle. (28 VDC
must be present at terminal strip TB3 lug 5.)
*This option requires a “split-C” connector, which is typically a special order from most aircraft cable
manufacturers.
-
+
TB3-5
Ground
Power
Unit
Aircraft Connector
Cable
Ju
m
p
er
Aircraft Receptacle
To airframe
To aircraft
busbar
To control
A-3-1 Standard wiring diagram
For service, maintenance and test purposes, the interlock system can be by-passed via the display setup.
To ensure personnel health and safety, the converter automatically returns into normal mode once it
receives a 28 VDC voltage at terminal TB3-5. (e.g. when the plug is connected to an aircraft.)
Note!
The interlock will not work correctly unless the negative busbar has a connection to the ground
block. (The ARU comes equipped with this connection already made, but it might have been removed to
meet other requirements.) If the interlock is not going to be used, a minimum of an 18AWG wire should be
connected from the + busbar to Terminal 3 lug 5 (wire 34).
A.4 Operator’s Instruction

To adapt the 28 VDC output power to different types of aircraft, it is possible to set a maximum DC
current level in selectable steps of 50, 100, 200 and 300 A. The actual step size is selected in the
Setup Menu.

NOTE! The unit remembers the last current limit value that was selected. Make sure this
value is not too high for the aircraft being powered.
OM2247 Rev B Page 108 of 125