Tecnnical Data and Specifications
8-7
Revision 2 - 20 March, 1997
HP SERIES DIMMER
OPERATING MANUAL
8.5.3
Delta Supply Operation
The available venue mains supply in some countries (eg. the Philippines) is in the
form of three phases (220 volts between phases) with no neutral connection. The
dimmer may be configured for operation from 220V delta supplies.
The bridge between the three neutral terminal poles (N1, N2, N3) must be removed
before the three incoming active lines are connected.
•
The first incoming active is connected to terminals A1 and N3.
•
The second incoming active is connected to terminals A2 and N1.
•
The third incoming active is connected to terminals A3 and N2.
WARNING
This connection is ILLEGAL in Australia, Europe and the U.K.
This connection renders the output socket’s neutral pins LIVE.
Note that a dimmer wired in this fashion will be subjected to CONTINUOUS
OVERVOLTAGE if connected to the 415V wye or star three-phase supply of most
countries.
The three active lines must each be protected at not more than 50 amps. The dimmer’s
breakers are not rated to clear faults if the supply is protected at currents of over 50
amps. The earth conductor must be rated the same as the active lines.
The overvoltage and voltage-difference detection will operate as normal. The neutral-
earth voltage detector will sense whether the "centre" (average) voltage of the three
phases deviates more than 15 volts from earth.
8.5.4
Operation in Europe
In some countries the neutral is not tied to the earth at the switchboard of the building.
In this case the Neutral-Earth voltage may become large enough to trip the protection
circuitry under normal operation. In this case disable the power fault detection system
as described in section 4.1.4.5
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MANUAL ENDS
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