Jands HP6, Technical Manual

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Equipment Description 3-1
Revision 2 - 26 April, 2000 HP SERIES DIMMER TECHNICAL MANUAL
3.0 Circuit Descriptions
(
Figure 3.1
The Output PCB contains the circuitry for the output devices (triacs in the HP12-TR and
SCRs in the HP12-SC and HP6-C), the temperature-controlled fan, and the 15 volt
power supply.
3.1 Mains and Low Voltage power supplies
The dimmer electronics uses low voltage dc power at 15 volts (unregulated) and 5 volts
(regulated). The HP12-SC also uses a 10V regulated supply for the gate drive
oscillators. The unregulated DC power is supplied by three transformers mounted on the
output PCB.
3.1.1 Mains Circuit Wiring:
The mains circuits of the HP dimmers are configured as three separate phase circuits,
with four channels per circuit. The three active mains inputs and three separate mains
neutral inputs appear at a terminal block, labelled A1, A2, A3 and N1, N2, N3
respectively. The ground terminal is an adjacent M4 stud.
This wiring allows the dimmer to be configured for three-phase star (wye) mains
supplies, three-phase delta supplies or single-phase supplies.
THREE PHASE OPERATION ("NORMAL"):
The rack mount HP dimmers are normally supplied with a three-phase power cable and
plug attached, suiting the vast majority of available mains supplies (ie. three phase and
neutral). The three live mains phases are connected to terminals A1, A2, A3. The three
neutral poles are bridged with a copper link, with the mains neutral connected to terminal
A2.
SINGLE PHASE OPERATION:
The dimmers may be configured for single phase operation where three phase mains
supply is unavailable.
The dimmer should be supplied with three same-phase actives and three neutrals. The
three active lines must each be protected at not more than 50 amps [63 amps: HP6-C].
The three neutral conductors must each be rated at the same current as the actives. The
earth conductor should be similarly rated.
The bridge between the three neutral terminal poles (N1, N2, N3) must be removed
before the three incoming neutral lines are connected to these terminals. The three
incoming actives are connected to A1, A2, A3.