Change The Current Transformers - ABB PSTX370 Service Manual

3.5.3

Change the Current transformers

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.
Remove cover and PCBA
Dismantle the front cover, all cables and the PCBA
as described in chapter 3.4.1, step 1-5.
1. Remove PCBA bracket
1
Remove the PCBA bracket by lifting it upwards
from unit.
2. Disconnect flexible bars
1
Loosen (3x) Torx 30 M6x25 (one screw per
phase) to disconnect the flexible bars.
3. Remove bypass contactor
1
Loosen (4x) Torx 25 M3x8 from the bypass
contactor.
2
Loosen (3x) Torx 30 M6x25 from the
bypass contactor.
3
Remove the bypass contactor (including cable)
by lifting it upwards from unit.
4. Remove phase bar and current transformer
1
Loosen (1x) Hexagon no. 8 M10x60 from
the phase bar. Also remove sleeve and washer.
2
Loosen (1x) Torx 25 M5x18 from the phase
bar.
3
Slide the phase bar outwards from current
transformer until unattached; remove phase bar
and current transformer from unit. Dispose of
expended current transformer.
1
2
3
1
4
3
| Service Manual | Service PSTX210...370
1SFC13105M0201
1
3.5.3_1
1
Tx 30
M6 x 25
3.5.3_2
2
Tx 25 Tx 30
M5 x 18
M6 x 25
3
3.5.3_3
1
Hex no. 8
Tx 25
M10 x 60
M5 x 18
2
3.5.3_4
3
33