Operation Manual – AXA 2400 Compact Power– 30 - 90 kVA
General Description
Document no. 578.650BB
Page 13 of 91
3.1
Built in features / protections
No Break Power Transfer:
The unit is protected against misalignment during the No Break Power Transfer.
Over/under voltage at input:
The input voltage supervision is based on the rectified DC. The supervision ensures that the unit does
not trip even in case of an abnormal low input voltage level. This of course presupposes that the 400 Hz
output level and quality, required by the aircraft, can still be maintained. If the rectified DC level gets
too low or too high, the unit trips to protect itself.
Over/under voltage at output:
If the output voltage exceeds or is below the levels in the table below, the unit automatically shuts down
and opens the output contactor.
Output Voltage U > 130V – 250ms
Output Voltage U > 140V – 15ms
Output Voltage U < 104V – 500ms
Overload:
If the output current exceeds the overload ratings in the table below, the unit shuts down to protect itself
•
125% for 600 seconds
•
150% for 60 seconds
•
200% for 30 seconds
•
300% for 10 seconds
•
400% for 1 second
Short circuit at output:
The unit has a built in system to protect itself & the output cables, if the units output(s) are short
circuited for some reason.
Internal high temperature:
If for some reason the internal temperature on the Inverter Module or the Output Transformer, rises
above the factory set temperature level, the unit shuts down, reporting either “
INVERTER TEMP TOO
HIGH
”
or “
TRANSFORMER TEMP TOO HIGH
”
Control voltage error:
If the control voltage supplied from G1 is < 20 VDC, the unit shuts down and reports
“CONTROL VOLTAGE LOW”
Aircraft Connector Insertion:
This feature verifies that the 90% switch / split “F” pin in the 400 Hz plug is activated. If not activated,
the respective outlet cannot be engaged. This also includes a potential free output showing whether the
Aircraft Connector is inserted or not. The feature is valid for ground power units with one or two outlets.
How to Bypass / Activate the function.
Refer to Section 6.3 & 7.11
For detailed information /connection.
Refer to chapter 4.9
