Siemens ST750 Note d'installation - Page 2

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POWER/PHASE ASSEMBLY REMOVAL AND RE-FITTING, INCLUDING PHASE DRIVER PCB REPLACEMENT

Important Note! Dangerous voltages may be present

inside the Power/Phase assembly. Ensure that the mains

supply is isolated at the Master Switch before

commencing the fitting process.

Isolate the Mains to the ST750 at the master switch.

Disconnect the 64-way Phase Control ribbon cable and

other cables from the CPU.

Unclip the earth lead from the hinged front plate.

Remove the front plate holding the CPU (and I/O or OTU)

and store carefully.

Disconnect the earth wires from the fixing point in the

assembly.

Disconnect PL6, PL7, and SK2.

Warning Care must be exercised when removing or

inserting the green connectors and their cables from the

PCB, as strong extraction and insertion forces are

required. Be careful not to over flex the board, which

could cause tracks to fracture and the board to fail.

Disconnect PL1 and SK1.

Using a medium crosshead screwdriver, loosen (do

not remove) the four screws holding the

Power/Phase assembly to the equipment mounting

plate. Lift the assembly off the mounting plate.

Replace the Phase Drive PCB, as detailed below,

checking that the end part numbers are the same,

i.e. /002 for 2-phase, and /004 for 4-phase.

10. Undo the EMC Filter fixings (M5 stainless screw,

shakeproof washer and nut), so the EMC Filter is

free to move.

11. Remove the Mains Live/Neutral connections to and

from the EMC Filter and Switch.

12. Remove the M3 Hex Spacers that retain the Phase

Driver PCB.

13. Lift out the Phase Driver PCB, noting that it has to

disengage PL1 and SK1.

14. Cut the tie wraps holding the PSU cables, and

unplug the cables from PL2.

15. Remove the PSU from the nylon PCB supports.

16. Fit the new nylon PCB supports to the new Phase

Driver PCB.

17. Fit the PSU onto the new Phase Driver PCB.

18. Plug the PSU cables into PL2, and tie wrap the cables to

the Heatsink/Cover.

19. Fit the Phase Driver PCB into the Power/Phase

assembly.

Notes:

When upgrading to LED Signals, it is recommended that individual neutral returns are used for each green

signal if spare cores are available. Refer to Traffic Signal Junction Cabling Design Certification document

667/DS/20664/000 for more information.

It is recommended that the WID handset command is used to assist Installation and Commissioning.

Traffic Solutions, Siemens Mobility want to assist in the Retrofit process, and have therefore introduced the

option of a basic 'Biscuit Tin', 667/1/27870/799, so that Depots can purchase one or two basic 'Biscuit Tin'

units, and use them to prepare 'Biscuit Tins' with new Phase Driver PCBs for subsequent site installation. The

basic 'Biscuit Tin' includes the Toggle Switch and EMC Filter with associated wiring, and fixings required for the

new Phase Driver PCB.

SUPPLY DETAILS

Siemens Plc

Mobility Division – Traffic Solutions

Sopers Lane, Poole, Dorset, UK

BH17 7ER

667/CI/32755/000 issue 5 (20.01.2015)

20. Fit the M3 Hex Spacers to retain the Phase Driver PCB.

21. Re-fit the Mains Live/Neutral connections to and from the

EMC Filter and Switch, being very careful to fit them

correctly with respect to polarity and Filter input/output,

as shown below.

Fast-on

Tag

TAG1

TAG2

TAG3

TAG4

22. Secure the EMC Filter using the fixings (M5 stainless

screw, shakeproof washer and nut).

23. Ensure that all Phase Driver links and fuses are set

correctly (i.e. in the same position as the original unit),

noting that Wait links and fuses are not present on the

new Phase Driver PCB.

24. Reconnect PL1, PL6, PL7, SK1, SK2 and the earth wires.

25. Replace the hinged front plate holding the CPU PCB and,

if fitted, the I/O or OTU PCB.

Tie

wraps

EMC

Filter

fixings

26. Replace all the cables to the CPU. Clip the earth lead to

the front plate

27. Restore power to the ST750.

Figure 1 – ST750 LED Phase Driver PCB in 'Biscuit Tin'

Tel: +44 (0) 1202 782255 (Support Desk)

Website:

http://www.siemens.co.uk/traffic

Wire Connection

Mains Live from EMC Filter Output (Load)

Mains Neutral from EMC Filter Output (Load)

Mains Live to Switch

Mains Neutral to EMC Filter Input (Line)

Mains Live/Neutral from EMC Filter

Mains Live/Neutral to Switch/EMC Filter

M3 Hex

Spacers

Nylon PCB

Supports

for PSU

M3 Hex

Spacers

Earth

strap to

Door

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