13
1.5
Overload Protection
The equipment is fitted with fixed and variable overload protection circuits as standard.
1.5.1
Fixed Overload
The fixed overload protection system senses any rapid increase in the load current which
exceeds approximately 120% of the full load current in the high voltage circuit. The circuit will
respond more quickly to low impedance faults.
1.5.2
Variable Overload
The variable overload protection system senses current changes in the high voltage circuit.
The trip level is adjusted by means of a selector switch on the front panel of the control unit.
The switch allows the level to be adjusted from 10-110% of normal full current in eleven steps.
The circuit will activate when the load current exceeds that set by the trip level selector switch.
The circuit will respond to more slowly changing levels of load current.
IMPORTANT NOTE:
The variable overload trip circuit does not limit the output current on
short circuit.
Summary of Contents for KV mk2 Series
Page 28: ......
Page 30: ...30 Drawings 001555 KV100 100 001808 KV30 100T ...
