ABB PSTX370 Service Manual page 57

4.5 Change the Fans, Bar holders and
Current transformers
This chapter describes changing of the Fans, Current
transformers and Bar holders.
CAUTION
Always make sure that the power supply is
switched off before doing maintenance on the
Softstarter.
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.
Tools required:
• Torx 20 for removing the fan cover
• Torx 20 for removing the fans
• Torx 20 for removing top cover
• Torx 30 for removing angle brackets
• Torx 30 for removing internal phase bars
• Torx 30 for removing phase bars
• Hexagon no. 8 for removing bar holders
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