Cu 100 Control Box - Grundfos SEG Serie Montage- Und Betriebsanleitung

8.2 CU 100 control box

The CU 100 control box incorporates a motor-
protective circuit breaker and is available with level
switch and cable.
Single-phase pumps
A run capacitor must be connected to the control
box.
For capacitor sizes, see the table below.
CS,
Pump type starting
capacitor
[kW] [μF]
0.9 and 1.2 150
1.5 150
Start and stop levels
The difference in level between start and stop can be
adjusted by changing the free cable length.
Long free cable = large difference in level
Short free cable = small difference in level.
Both the two following points must be
Note
observed.
• To prevent air intake and vibrations, install the
stop level switch in such a way that the pump is
stopped before the liquid level is lowered below
the upper edge of the clamp on the pump.
• Install the start level switch in such a way that the
pump is started at the required level; however,
the pump must always be started before the
liquid level reaches the bottom inlet pipe to the
pit.
Warning
The CU 100 control box must not be
used for Ex applications.
See section 8.3 Pump
Warning
The pump must not run dry.
An additional level switch must be
installed to ensure that the pump is
stopped in case the stop level switch is
not operating. See fig. 6.
The pump must be stopped when the
liquid level reaches the upper edge of
the clamp on the pump.
Float switches used in potentially
explosive environments must be
approved for this application.
They must be connected to the
Grundfos DC, DCD and LC, LCD 107,
LCD 108 and LCD 110 pump controller
via an intrinsically safe barrier to
ensure a safe circuit.
16
CR,
run capacitor
[V] [μF] [V]
230 30 450
230 40 450
controllers.
Fig. 6 Start and stop levels
Alarm
Start
Stop