Mounting Of Lc 108 For Star-Delta Starting - Grundfos LC 108 Montage- Und Betriebsanleitung

Figure 1 shows the internal construction of the LC 108 for
direct-on-line starting.
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Fig. 1
Figure 2 shows the terminals listed under positions 2 and 3.
Fig. 2
Key to the symbols in figs 1 and 2:
Pos. Description
1 Module CU 211.
Terminal block for level inputs
2
(11-12, 21-22, 31-32, 41-42).
Terminal block with:
• input for the PTC resistance/thermal switch of the
motor (T11-T21),
3
• output for external alarm device for high-level alarm
(H-NC, H-COM, H-NO) (only certain variants),
• output for external alarm device for common alarm
(G-NC, G-COM, G-NO).
Motor protection relay (contacts and thermal relay
4
fitted).
5 Terminal block for electricity supply.
Fuse holders for control circuit fuses (1 to 3 depending
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on voltage/current variant).
9 Pg cable entries.
10 Earth bar ( ).
PE
If the distance between the controller and pit
exceeds 20 metres, it is not advisable to use
electrodes as problems with the signal values
Note
sent back to the controller may arise.
In such cases, it is recommended to use float
switches.
Cables of up to 100 metres can be connected
Note
between the controller and the float switches.
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3.3 Mounting of LC 108 for star-delta starting

Before mounting, remove the transport protectors, if any, from
inside the cabinet.
Mount the LC 108:
• on a plane wall surface,
• with the Pg cable entries pointing downwards (additional Pg
cable entries, if required, must be fitted in the bottom plate of
the cabinet),
• with four screws through the mounting holes in the back plate
of the cabinet, see fig. 3. The mounting holes must be bored
with a 4 mm bore. Fit the screws into the mounting holes and
tighten securely. Fit the plastic caps supplied with the
controller on the screws (IP65).
Figure 3 shows the internal construction of the LC 108 for
star-delta starting.
Fig. 3
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