Siemens ST750 - Phase Driver PCB

Mobility and Logistics, Traffic Solutions
Sopers Lane, Poole, Dorset, BH17 7ER
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Page
59 of 73
Version 008
Status
Released
Last Editor Nathan Fearnhead
Date
16/06/2017
Document Name Configuration Control
Document No.
667/CC/32750/000
Copyright © Mobility 2017. All Rights Reserved. Mobility is a division of Siemens Plc
4.2.3 Phase Driver PCB
With reference to Figure 67 Figure 68, the Phase Driver PCB is
mounted at the rear of the ST750LV Rack Assembly. As detailed in the paragraph immediately
above, primary communication between the CPU PCB and the Phase Driver PCB is carried out
via a 64 way ribbon cable (PL 4 CPU PCB and PL4 Phase Driver PCB).
Mains supply is applied to the Phase Driver PCB via PL1 and is derived from the Master Switch
Unit.
Phase drive outputs are taken from PL6 and applied to the appropriate terminal block, for onward
distribution to street equipment. The required number of phases to be driven will be specified
when the controller Outercase is chosen, refer to paragraph 4.1 above. If two phases are
specified PL7 will not be fitted to the Phase Driver PCB. If a four phase Outercase is specified,
output to phases 3 and 4 will be provided via PL7. PL8 is used for phase distribution on export
controllers and is beyond the scope of this document.
When the Standard Phase Driver PCB is fitted, which drives incandescent Traffic Signal Heads,
Phase supply voltage monitoring is performed by voltage monitoring transformers on the Phase
Driver PCB; activated by handset commands. If additional voltage monitoring is required torroidal
inputs should be connected into PL5.
PL2 is used to output mains voltage to the 24V power supply and input the resulting 24VDC back
to the Phase Driver PCB.
SK2 is connected to the Dimming Transformer; please refer to paragraph 4.5 below.
Phase Supply Returns and 48V returns are wired into SK1.
The Standard Phase Driver PCB is fitted as a standard item and should not be ordered
separately.
When the CLS (NLM) Monitoring Phase Driver PCB is fitted PL8 provides connection for Phase A
Red Vehicle RLM Channels 3 and 4. PL5 is only used for Wait torriodal inputs. Please refer to
Handbook 667/HB/32921/007 for full details on the ST750LED controller option. Full details on
retrofit of the ST700 and ST750LV to ST750LED is also provided in Handbook
667/HB/32921/007.