ABB PSTX370, Service Manual

Page: 42 / 86

42 Service PSTX210...370 | Service Manual | 1SFC13105M0201
5. Detect a shorted SCR
The three different phases will give six values.
If any of the values shows lower than 1 Mohm there
is probably a shortage. Proceed with changing the
SCR, see chapter
3.6.1 Change the SCR
.
6. Connect SCR cables to PCBA
1
Place the cables in the cable holders located on
bracket.
2
Connect the three SCR cables, according
to previously made markings (1, 2 or 3), to their
terminals on the PCBA.
7. Place front cover
Place the front cover on the unit and align it to the
plastic screw sleeves located on lower housing.
1
Fasten the front cover with
(4x) Torx 20 4,0
x80/10 (1,6Nm) .
2
Fasten
(1x) Torx 15 M3,5x12 (0,5 Nm)
on the HMI bracket.
REASSEMBLE THE SOFTSTARTER
Connect main power cables and control
cables
Connect the main power cables and the control
cables as described in
chapter 3.3.2, step 1-2
.
8. Examples of SCR for PSTX
Figure 8
shows typical types of SCR blocks used
in PSTX210…370. The manufacturing type can
be both IXYS (black housing) and Semikron (white
housing).
9. Examples of SCR for PSTX
For Softstarters type PSTX470...570 we are using
SCR of capsule types.
See figure 9 .
Please note that this type of SCR has to be
correctly mounted when tested to get the correct
result.
6
3.7.1_6
2
1
Tx 20 (1,6 Nm)
4,0 x80/10
Tx 15 (0,5 Nm)
M3,5 x 12
7
3.7.1_7
1
2
8
3.7.1_8
9
3.7.1_9
3