Feeders; Loop Configurations; Replacement Controllers; Replacement Va Loops - Siemens BH17 7ER Installation Manual

2.2.7 Feeders

Sharing of a multi-pair feeder cable between different detectors is not
recommended. See section 2.7 for feeder types.
2.3

Loop Configurations

Loop positions will be marked prior to slot cutting, as per the positioning
instructions shown on the STS.
Loop configurations are normally of the following types:
Chevrons -
Diamonds -
Rectangle -
Special loops -

2.3.1 Replacement Controllers

Replacement controllers should continue to use existing diamond Vehicle
Actuation loops where they are in good condition. Any existing SDE/SA loops
for replacement controllers should be re-cut to the new 3.6 m standard prior to
commissioning.

2.3.2 Replacement VA Loops

If a diamond loop needs re-cutting it should be re-cut as a diamond. However
if all the loops on an approach are to be re-cut then the chevron loop
configuration should be used. It is permitted to have all chevrons on one
approach and all diamonds on another subject to the following clause; where
two or more VA loops are connected to the same detector channel they must
all be to the same configuration, i.e. ALL Diamond or ALL Chevrons.

2.3.3 Replacement SDE/SA Loops

If a 3.05 m spacing SDE/SA loop needs re-cutting it should be re-cut to the
same spacing as the original unless every approach on that controller is re-
cut. In that case the new 3.66 m spacing should be used and the controller set
up or reconfigured accordingly. Controllers cannot accept inputs from loops of
mixed spacing.

2.3.4 Use of Soundmark Test Sets

Care must be taken when selecting the loop pitch on Soundmark Test Sets.
Selecting PLE selects the old Plessey loop pitch of 3.05 m (10 ft). Selecting
GEC selects 3.6 m (12 ft) which is now common for GEC, Microsense and
NEW STC equipment.
667/HE/20663/000
Vehicle actuation, SDE/SA
Vehicle actuation (use for replacement or MOVA
only)
Turning loops, SCOOT, COUNT, QUEUE and
special purpose (Required for SDE/SA for previous
detector types).
MOVA loops (diamonds are recommended)
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