ABB PST60, PST72, PST105, PST85, PST142 User Manual

Softstart

1SFC132040M0201 RevA Dec-06

Upgrade to Torque control
PST30…300
PSTB370…1050

Contents

1. ESD Warning...................................................................................................................2

2. Tools................................................................................................................................2

3. PCB information ..............................................................................................................2

4. Step by step.....................................................................................................................3

5. Configuration of the LV board..........................................................................................7

1. ESD Warning

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.

2. Tools

Torx T15 for removing the Cover from PST30 … PST72

Torx T20 for removing the Printed Circuit Board.

for removing the Cover from PST85…PST300 and PSTB370…PSTB1050

3. PCB information

For upgrade to Torque Control both LV board and HV board needs to be upgrade to following
version:
LV board 1SFB636068D1011
HV board 1SFB636068D1013

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4. Step by step

1. Before disconnecting the cables mark them.

2. Disconnect the cables from terminals 1L1,

3L2, and 5L3 (main voltage).

3. Disconnect all cables from the terminals 1 to

20, external keypad, PTC sensor and the
Fieldbus plug.

4. Remove the front cover (four screws).

5. Discharge the tools and yourself by touching

earth (if you are not earthed).

6. Disconnect the cables on the HV-Board from

the thyristors and fans. Mark the cables from
the thyristors with L1, L2 and L3.

7. Remove the five screws.

8. Remove the old HV-Board. Don’t lose the

connector between HV-Board and LV­Board.

9. Disconnect the cables on the LV-Board from

the thermal switch and current transformers.
Mark the cables from the current transformers
with CT1, CT2 and CT3.

10. Remove the six screws.

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