Specifications
Siemens Mobility, Traffic Solutions
Sopers Lane, Poole, Dorset
BH17 7ER
Version 10 Page 61 of 120 Status Issued
Last Editor harry.smyth Date 03 November 2014
Document
Name
GENERAL HANDBOOK FOR HEIMDALL
DETECTORS
Doc. No.
667/HB/31900/000
Copyright Siemens plc 2014 All Rights Reserved
5.6.3 Operating Current
The overall operating current will depend whether any additional facilities are provided.
Table 5-22 below lists the typical current requirements:
Table 5-22 – Pedestrian On Crossing Detector Operating Current
Note: When power is first applied to the detector the following surge currents are drawn
from the supply:
DC Supply: 3.2 Amps (max) for < 2 ms when the supply is 29 VDC.
AC Supply: 4.2 Amps (max) for < 2 ms when the supply is 29 VAC.
If the detector has additional facilities fitted then the currents listed in Table 5-23 below
should be added to those shown in
Table 5-22.
Additional Facility
24 VAC
24 VDC
Siemens SiTOS Serial Interface
(connected)
6 mA 5 mA
Siemens Wireless Interface (connected) 11 mA 10 mA
Table 5-23 – Additional Facilities Operating Current
Refer to Section 10 for details on power and cable length calculations.
5.6.4 Detector Installation Instructions
5.6.4.1 Detector Position
Each detector must be aimed at the opposite kerb as shown in Figure 24 below.
There must be no obstruction between the front face of the detector and the detection
zone, i.e. no obstruction by backing boards or signal aspects. Failure to adhere to this
recommendation will reduce detector performance.
The detector should normally (first choice) be located on the offside primary signal pole
(ref. Figure 24 ). Alternatively the detector may be fitted on other poles if circumstances
dictate. The following factors may influence position:
Line of sight obstruction such as signs, trees etc.
Road layout permits better aim from offside pole.
Cabling requirements.
If the detector is installed alongside a Heimdall kerbside detector, using the standard
Kerbside Mounting Bracket, it can be installed on one of the mounting holes halfway
along its length. This is only recommended for thin crossings as the bracket can part
mask wider installations. If this is the case a kerbside extension bracket can be used to
move the on crossing detector to a better position.
24 VAC Supply 167 mA
24 VDC Supply 131 mA