Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 283)

T400 Controller Facilities Manual

667/EB/20200/000 Page 25-12 Issue 9

If the nominal load current (excluding red/ambers) of a particular controller

output exceeds 4.0A rms., at nominal mains voltage, then that output should be

split and treated as two separate outputs.

Note that for red lamp monitoring, no more than 10 x 50W halogen bulbs

(or equivalent loading) should be monitored by a current sensor performing

RLM. The recommended limit is therefore 8 signal heads per red lamp

monitored vehicle phase, or, if the phase controls more than one approach,

8 signals heads per approach and each approach monitored separately. Also

note that any red lamp monitored vehicle phase, can only be split on an

approach basis - any one approach cannot be monitored by two or more

sensors since a single bulb failure on each sensor is not accumulated into a

second red lamp failure. It is recommended that a red lamp monitored

vehicle phase controlling more than one approach is actually split into one

phase for each approach when the controller is configured.

Note 2:

For example, 8 pedestrian plus 8 wait indicator.

Note 3:

For example, 8 vehicle plus 4 pedestrian plus 4 wait indicator.

Note 4:

To allow monitoring of tube type signs at 50-0-50 Volt sites, the signs must be

driven with the 50-0-50 Volt supply and the tubes must have the standard

voltage-current characteristic.

CAUTION

The current sensors may produce a high voltage if current is passed through the

core when they are not terminated into the OTU board.

The Current transformers (part number 667/7/25171/000) measure the current flowing

in conductors that are passed through their core. To maintain the correct relationship

between the current flowing in the conductors and the output from the sensor, the

sensors must be connected the correct way round.

The current transformers are toroidal and one side is marked with a spot to indicate the

input direction. The Live conductor(s) should pass from the controller output

terminal(s) through the centre of the current transformer, entering the side with the

spot marker, and on to the lamp(s).

The output wires from the current transformer are red (positive) and white (negative)

and are terminated with Berg mini PV terminals which are clipped into a Berg mini

latch housing to provide a complete sensor assembly which plugs into PLB on the

ancillary processor. Referring to Figure 25.2, the red wire connects to the required

number LMU input shown with a +, and the white wire connects to the corresponding

- input. Inputs should normally be allocated consecutively starting from number 1. The

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