ABB PSTX370 Service Manual page 73

4.7.2 Assemble the Softstarter
Please don't forget to vacuum clean the
Softstarter from dirt and dust when reassembling.
CAUTION
Use protective gloves when working with cover
plates to prevent cutting injuries.
1. Place new SCR
Make sure that the symbol and type specification
of the new SCR corresponds to previously installed
SCR prior to assembly. Do not scratch the contact
surfaces with the guide pins. Turn the component
so that the SCR wires point in the direction towards
the bypass contactor.
1
Make sure to place the SCR units in the right
direction, according to illustration.
2
Place the lower SCR unit and middle heatsink
onto mounting screws on cooling tower. Align to
guide pin.
3
Place the upper SCR unit and upper heatsink
onto mounting screws on cooling tower. Align to
guide pin.
2. Place screw-nuts and tension bars to cooling
tower
1
Place the distance bar onto mounting screws
on cooling tower.
2
Place the two torque washers and tension bar
onto mounting screws on cooling tower.
3
Place (2x) Hexagon M10 Screw-nut and
the two spring washers onto mounting screws on
cooling tower (do not yet fasten). Spring washers
are to be placed with the concave side facing
downwards.
3. Fasten tension bars to cooling tower
1
Fasten (2x) Hexagon M10 Screw-nut by
hand until clamps are tightened.
2
Fasten each nut additionally by half a turn
alternately until the spring gap indicators are just
trapped, then tighten 1/4 turn.
The slope may not be more than 2 mm.
See figure below:
1
2
3
| Service Manual | Service PSTX470...570
1SFC13105M0201
2
UP
1
3
DOWN
4.7.2_1
Hexagon nut
3
M10
2
1
4.7.2_2
2
Hexagon nut
M10
1/4
1
4.7.2_3
4
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