Siemens TIASTAR Інструкція з експлуатації - Сторінка 25
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3.16 Field Additions
Field additions may be made to the motor control center if the
current rating of the main or vertical bus is not exceeded. The
preparation of the floor and conduit is the same as in a new
installation. Any new shipping section will contain all of the
necessary hardware and bus connecting links. De-energize the
existing motor control center and remove the top and bottom
side covers from the new and existing vertical frames which
are to be joined. After joining the structures per the instruc-
tions in the installation section of this manual, perform the
pre-energization checks outlined in the operation section of
this instruction manual.
Additions to motor control centers fall into two general cate-
gories: additions of structures and additions or replacement of
plug-in units. The addition of structures is similar to the instal-
lation of motor control centers which have been shipped in
several sections. When mounting methods or models of new
and existing sections differ, care must be exercised to ensure
proper alignment of horizontal bus. The new structures are
then treated the same as in a new installation. This is dis-
cussed in detail in the Joining Shipping Sections portion of this
manual.
3.17 Plug-In Unit Removal
Hazardous voltage.
Will cause death or serious
personal injury.
Energized vertical bus may be partially
exposed through the access holes in the
barrier when the unit is not fully insert-
ed. Use extreme caution when perform-
ing any wiring or maintenance with the
unit withdrawn.
1. Put the disconnect operating handle in the .OFF. position
(Fig. 44). The interlocking mechanism will not permit
removing or inserting the unit with the handle in the .ON.
position.
Figure 44 - Racking lever allows easy unit removal
2. Unscrew the multi-turn latch on bottom plate of the unit.
Rotate the latch until it disengages from the separator
angle.
Note: High density (6.) units do not utilize a multi-turn
latch.
3. Open vertical wireway door.
Siemens Energy & Automation, Inc.
4. Move the unit to the .test. position by opening the racking
lever (Fig. 44) on the top barrier plate while pulling on the
supplementary installation handle on the bottom barrier
plate. The unit can be padlocked in the test position
(Figure 47).
5. Disconnect control and load wiring.
6. Remove the unit by tilting and sliding out.
7. Pilot devices are mounted in a pilot device panel attaches to
the unit door with two captive screws (Figure 45). To
remove the pilot device panel from the unit door, loosen the
bottom screw a couple of turns, then loosen the top screw
to release the top of the pilot device panel. Tilt the top of
the pilot device panel away from the back of the unit door
and lift the pilot device panel off of the unit door. The top
mounting screw is captive to the unit door while the bottom
mounting screw is captive to the pilot device panel.
8. Once the pilot device panel has been removed from the unit
door, tabs located on the metal pilot device panel allow the
pilot devices mounted on the motor control center unit for
unit removal and service (Figure 47).
9. To re-install the pilot device panel on the unit door, place
the bottom pilot device panel screw in the slot at the bot-
tom of the pilot device panel cut out. Push the pilot device
panel against the inside of the unit door and tighten both
pilot device panel mounting screws.
Figure 45
Figure 46
Captive Screws
Figure 47
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