APC user manual 30 6739380EN/JC

Environment information (cont.)

Signal transmission

These signals are each transmitted by two volt-free changeover contacts with a maximum breaking capacity of 5A 250V.

◗"overload" signal indicates that an overload has taken place (Pload > Pnominal in kVA);

◗"rectifier/charger function fault" signal indicates that:

◗a fault has taken place in the rectifier/charger module,

◗Mains 1 input switch Q1 is open;

◗"inverter function fault" signal indicates that a fault has taken place in the inverter module;

◗"transfer to inverter fault" signal indicates that the load transfer conditions from Mains 2 to the inverter are incorrect;

◗"transfer to Mains 2 fault" signal indicates that the transfer to Mains 2 conditions (voltage, frequency or phase) are incorrect and a forced transfer will result in a 0.8 second interruption in the supply of power to the load;

◗"rectifier/charger on" signal indicates the status of the module.

Note:

A Static Switch Cubicle receives only the following signals:

◗overload,

◗transfer to inverter fault,

◗transfer to Mains 2 fault.

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