Reference Manual

Table Of Contents

Unit Description, PSU 1200 W

• Input mains fault

•

Input undervoltage

• Input overvoltage

• Output overvoltage hardware alarm

• Output overvoltage software alarm

• High internal temperature

• Power limit

• Short circuit/overload for more than one minute

Voltage Adjustment

The desired value of the output voltage of the rectiﬁer is set by the

ECU function in the DXU. The PSU has a default value of 27.2 V. The

DXU adjusts the individual PSU voltage to maintain the required

system voltage.

Load sharing is achieved by the DXU function when using more than

one PSU, load sharing of parallel PSUs is achieved by adjusting the

individual voltages to each PSU in the system.

Output voltage from the PSU is adjusted to between 26.2 V and 28.5 V

depending on battery temperature.

Power Limitation

When the temperature exceeds the permissable value, the PSU reduces

power and an alarm is sent to the DXU. Output power increases when

the temperature drops, and the alarm is reset.

When the output power of the rectiﬁer reaches 1200 W, the rectiﬁer

limits its power by reducing its output voltage to maintain a constant

output power. The output current increases to a maximum of 60 A even

in the event of short circuits.

EN/LZT 720 0008 R1A

2001-06-26

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