Operation Manual – AXA 2400 Compact Power– 30 - 90 kVA
General Description
Document no. 578.650BB
Page 10 of 91
Output Transformer (T2):
The output transformer ensures galvanic separation between input and output. It also transforms the
voltages from the Inverter Module
into the required aircraft voltage (3 x 200/115 V). The filter choke
for the output AC-filter is an integral part of the transformer.
AC Filter Capacitors (C7-C9):
The harmonic content of the inverter voltage is further reduced by means of the AC Filter, resulting in a
total voltage distortion of less than 2%. In addition to the filter choke (integrated into the transformer)
and the AC capacitors, the ground power unit is equipped with an RFI-filter that reduces the high
frequency emissions from the ground power unit or from the aircraft.
Output Contactor(s):
The ground power unit is equipped with a 3-phase output contactor per outlet. The contactor(s) is
engaged at start-up of the corresponding output, and it is disengaged, when the stop button is activated
or a system error occurs. If the interlock voltage, provided by the aircraft, is not returned to the ground
power unit within the delay settings (refer to chapter 6.3), the contactor also disengages.
Interface Board (A2):
The purpose of this board is to interface between the Control Board and the rest of the ground power
unit. The interface module includes the following functions:
•
Interface to the Display Board (CAN Bus, 24 VDC and EPO (External Emergency Stop)).
•
Fuse (F1 & F2) of the 24 VDC for I/O connections.
•
Fuse (F3) for Display Board (A3) and Operator Keyboard (A4).
•
Fuse (F4) of the 24 VDC for interface.
•
Fuse (F5) PWM control (X10) of fans (M1-M2) situated above the magnetics.
•
User EPO input (X14).
•
Measuring transformers for supervision of the 400 Hz output voltage (X26)
•
Interface for gate drives situated at the Inverter Module (X13).
•
Interface for current sensors situated at the Inverter Module (X23).
•
Relay control of output contactor(s) Q2 – Q3 (X16-X17).
•
Soft start control of Q5 (X12).
•
Input for temperature sensors (X18).
•
I/O ports for remote control (Start, Stop etc.), single output (X1).
•
I/O ports for remote control (Start, Stop etc.), second output (X2) when installed.
•
Protected interface for interlock signals.
