ITW GSE 4400, Руководство пользователя

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OM-2245 / Operation and Maintenance Manual
ITW GSE 4400 / 400 Hz. Generator Set
March 15, 2015 Chapter 1-3
Page 15
Some load banks do not provide this EF Interlock so the EF interlock function in the unit has to be
bypassed. Do not set this value to Bypassed for normal operation with aircraft. This setting is only to be
used by qualified personnel for testing the GPU unit or when the unit will be providing power to equipment
outside of an aircraft.
Note! The value will be automatically reset to Active if the unit detects 28 volts on the "F" pin input of the
I/O board.
Go into the Setup Menu and then scroll up or d
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Press the LEFT arrow button to exit the submenu and return to the submenu list.
4.5 28V Interlock
The 28V interlock is a personnel and equipment safety feature that is found on some commercial
turboprop aircraft. This 28VDC signal will not be present until the GPU closes its output contactor and
provides power to the aircraft connector. The connector typically has a split “F” socket with +28VDC on
one side and a jumper to the return wire on the other side of the socket. The GPU will not keep the output
contactor closed if this voltage is not detected on the return wire in the cable. (This option requires a
special cable such as the JB2840-30CS, JB2840-40CS or JB2840-50CS.)
Note! The value will be automatically reset to Active if the unit detects 28 volts on the "F" pin input of the
I/O board.
Go into the Setup Menu and then scroll up or down to the 28V Interlock submenu. Press the cent
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Press the LEFT arrow button to exit the submenu and return to the submenu list.
4.6 EF Interlock Ripple Level
The EF Interlock Ripple Level is part of the Neutral Voltage Displacement circuit. If an aircraft has a large
unbalanced load and the aircraft power cable has a broken neutral, then it is possible for the aircraft
frame to be energized to a dangerous level. This condition will result in an AC voltage induced onto the
EF DC signal.
This sub-menu sets the trip level for the AC ripple on the DC EF interlock signal. The default value is 7.0
volts and a setting of 0.0 volts disables the function.
Go into the Setup Menu and then scroll up or down to the EF Interlock Ripple Level submenu. Press the
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the new value. Press the LEFT arrow button to exit the submenu and return to the submenu list.
4.7 EF Interlock Delay
Some of the newer aircraft take a longer time between when 400 Hz power is supplied to the aircraft and
when the aircraft returns the 28 VDC EF Interlock signal. This setting allows the adjustment of the amount
of time the unit will wait until determining that the EF signal is not present and that the output power
should be shut off. The default value is 3.5 seconds.