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| Underwoods - Automatic Load Shedding |
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Automatic Load Shedding
Our new modular, automatic load shedding unit provides staged switching of
switchboard outgoing devices or plant items. The unit’s compact design enables
easy incorporation within our switchboard. Control is from an incomer mounted
current transformer and up to 8 stages of load shedding can be independently
adjusted offering the following functionality…
Control of current without memory: When the value of the control current reaches
the threshold displayed on the front face, the output relay changes state at the
end of a time delay. It returns to initial state instantly when the current
drops below the hysteresis threshold or when the power is disconnected.
Over current function (Upper): The power-on time delay prevents current peaks.
The delay on upward crossing of the threshold provides immunity to transients
and other interference, thereby preventing spurious triggering of the output
relay.
Under current function (Under): The power on time delay prevents the occurrence
of current troughs. The delay on downward crossing of the threshold provides
immunity to random dips, thereby preventing spurious triggering of the output
relay.
• Threshold and hysteresis is separately adjustable
• Selection of Over-current or Under-current is by means of a dip switch
Call 020 8362 0226 for more details.
see
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