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Softstart
Changing of
Printed Circuit Board
PS S18 - 300
5309 704-1 Rev2 May-03
- 2 -
Please note!
The life span of electronics can be affected by damage caused by electrostatic
discharge. This can happen if a charged tool or person touches a component.
Therefore it is very important that all tools and personnel are discharged by touching an
earthed point before the printed
circuit board or any of the components are touched. It is equally important to
discharge the package with the new component before opening it.
A person walking on a carpet can be charged with up to fifteen
thousand volt (15000V). Compare this with the fact that some sensitive
components can be destroyed when discharged on a much lower level
(about 100V). We kindly ask you to pay notice to this, as this is a vital point in order to
ensure the life span of the product.
NEWS - Different versions of PCB
It exist two different version of PCB’s out in the field. The difference is the
terminals for all internal connections like gate-cables, fan-cables etc.
This kit is suitable for exchange the PCB, both the old and the new version of PCB.
In this kit you find the PCB with the new terminals. If you then have an old type of
product, with the old type of PCB, you will need to cut the old connections to the
PCB and exchange them to the new ones added in this kit. The position / location
for each new terminal is shown in picture no 2 below.
Step by step.
1. Disconnect the voltage from terminals 1L1, 3L2, and 5L3 (main supply).
2. Disconnect all cables from the terminals 1 to.12.
3. Remove the front cover.
4. Discharge the tools and yourself by touching earth (if you are not earthed).
5. Remove the old P.C.B.
6. Disconnect the cable on the P.C.B. from the thyristors, fans and thermal switch.
7. Check if you have the old type of PCB or the new one. If the terminals are of the
same type you have a new PCB. If so go to No 9 below.
8. If you have the old type of PCB, cut the old wires, and exchange the terminals for the
gate wires, fan wires, and thermal switch to the new ones included in the package.
9. Discharge the package with the new P.C.B by moving it to earth.
10. Mount the cable on the P.C.B. from the thyristors, fans and thermal switch.
See Fig1
11. Mount the new P.C.B.
12. Mount the front cover.
13. Connect the voltage and the other cable.
Ready for start!!
- 3 -
This picture shows the old
type of PCB. On the next page
you find the new type, with
the new terminals.
Figure 1
- 4 -
ABB Automation Technology Products AB, Control
S-721 61 Västerås, SWEDEN
Telephone +46 21 32 07 00
TELEFAX +46 21 12 60 01
(Changing PCB PS rev 2 S.DOC
Figure 2 – view from the front of the PCB (component side).
The New PCB with all new added connections including
short cables, which need to be connected to the old
wires.
PS – make sure that you are placing the
jumper for supply voltage in the correct
position , 110 – 120V or 220 – 240V DS
/