Specifications

GEMINI

Traffic Outstation Handbook

667/HB/32600/000 Page 103 Issue 11

The Power Supply operates from 85 to 265V AC, and therefore needs no external set-

up to operate from either 120 or 230V AC.

However the OMCU’s lamp monitor Zero Crossover circuit requires setting. This setting

is achieved by selecting the correct input connector socket on the High Voltage cable

form.

If 120V setting is required, change the setting as detailed, before applying mains. The

relevant connector socket positions for the 120V or 230V setting is described below.

Note that if OMCU lamp monitoring is not required, then the wires from the PSU can be

left unconnected since the female bullets have plastic covers that naturally insulate

them.

Cableform Position

Voltage Supply

PL2 pin 11

ZXO Mains Input (Mains Live)

PL2 pin 13

Neutral Return 120V Operation

PL2 pin 14

Neutral Return 230V Operation

Note 1: Before applying the mains’ power, recheck the correct voltage setting has been

selected and the Zero Crossover Mains’ Input (ZXO Mains I/P) has been

connected.

Note 2: Pins 11, 13 and 14 should be connected as shown on the first LMU I/O board

only. These pins should be left unconnected on the second and third boards

fitted to a unit.

If 120V operation is required then a different variant of the Voltage Monitor Transformer

must be used. The 100V Welsh Office version is 667/7/25172/500, see section 5.2.7. A

design for a 120V version would need to be requested.

Input Live

Neutral

120V

ZXO Mains

230V