Change The Pcba - ABB PSTX370 Service Manual

3.4.1

Change the PCBA

WARNING. HAZARDOUS VOLTAGE
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.
3
DISMANTLE THE SOFTSTARTER
Remove main power cables and control
cables
Disconnect the main power cables and the control
cables as described in chapter 3.3.3, step 1-3.
1. Remove the front cover
1
Loosen (1x)
bracket.
1
Loosen (4x)
the front cover by lifting it upwards from unit.
2. Disconnect SCR cables from PCBA
Mark the SCR cables with 1, 2, 3 prior to
disconnecting them. This enables proper re-
connection.
1
Disconnect the three SCR cables from their
terminals on the PCBA using a long-nose plier.
2
Slide out the cables from the cable holders
located on bracket.
3. Disconnect bypass contactor cable and CT
cables from the PCBA
Mark the CT cables with 1, 2, 3 prior to
disconnecting them. This enables proper re-
connection.
1
Disconnect the bypass contactor cable from its
terminal on the PCBA using a long-nose plier.
2
Disconnect the three CT cables from their
terminals on the PCBA using a long-nose plier.
3
Slide out the cables from the cable holders
located on bracket.
Service PSTX210...370 | Service Manual |
26
Torx 15 M3,5x12 on the HMI
Torx 20 4,0 x80/10. Remove
1SFC13105M0201
1
1
2
2
1
3
Tx 15 Tx 20
M3,5 x 12 4,0 x80/10
3.4.1_1
2
3.4.1_2
2
1
3
3.4.1_3