Specifications

Siemens Mobility, Traffic Solutions

Sopers Lane, Poole, Dorset

BH17 7ER

Version 10 Page 68 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

5.7.3 Operating Current

The overall operating current will depend whether any additional facilities are provided.

Table 5-26 below lists the typical current requirements:

24V AC Supply 167mA

24V DC Supply 131mA

Table 5-26 – Pedestrian Kerbside 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 < 2ms when the supply is 29V DC.

AC Supply: 4.2 Amps (max) for < 2ms when the supply is 29V AC.

If the detector has additional facilities fitted then the currents listed in Table 5-27 below

should be added to those shown in Table 5-26.

Additional Facility

24 VAC

24 VDC

Siemens SiTOS Serial Interface

(connected)

6 mA 5 mA

Siemens Wireless Interface (connected) 11 mA 10 mA

Table 5-27 – Additional Facilities Operating Current

Refer to Section 10 for details on power and cable length calculations.