ABB PSTX370 Service Manual page 70

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4.7
Change the SCR
This chapter describes how to change the SCR.
CAUTION
Always make sure that the power supply is
switched off before doing maintenance on the
Softstarter.
WARNING
• SCR and heatsinks must be
handled carefully to avoid scratches and other
marks.
• Do not touch the contact surfaces.
• Do not lift the SCR by the SCR wires.
• Make sure that there is no damage to the
welding flange or to the contact surface.
4
WARNING
When performing maintenance on the Softstarter,
an antistatic strap must be used. The antistatic
strap should be worn on the wrist, and be
connected to an electrical ground, to prevent
electrostatic discharge (ESD) damage to the
Softstarter.
WARNING
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 PCBA 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 and function of the product..
The following instruction shows service on
Softstarter model PSTX470...570.
Depending on model small changes in the service
procedure may differ but the principle of the
service is the same.
Tools required:
Torx 20 for removing the fan cover
Torx 20 for removing the top cover
Torx 30 for removing angle brackets
Torx 30 for removing phase rails
Torx 30 for removing bolted bars
Hexagon socket wrench for removing M10 screw-nut
Abrasive cloth P600 to polish the SCR
Ethanol to clean the SCR
Silicone oil to prepare new SCR
Service PSTX470...570 | Service Manual |
70
1SFC13105M0201

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