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English (US)
9.1 Wiring diagrams
Fig. 4 Wiring diagram for single-phase pumps
Fig. 5 Wiring diagram for three-phase pumps
9.2 Start and stop levels
The difference in level between start and stop can be adjusted by
means of the installed level detecting equipment.
• 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.
Fig. 6 Start and stop levels
TM06 5693 0316TM06 5694 0316
320 °F/
275 °F
(160 °C/
135 °C
302 °F/
257 °F
(150 °C/
125 °C)
Wire no. Type Connection
1 Common (C) U1 / Z1
2Run (R) U2
3 Start (S) Z2
275 °F (135 °C) and
257 °F (125 °C)
below apply to
single-phase, 2 hp
(1.5 kW), pumps
338 °F
(170 °C)
302 °F
(150 °C)
Both the two following points must be observed.
The pump must not run dry. Install an additional level
switch to ensure that the pump is stopped in case the
stop level switch is not operating. Stop the pump
when the liquid level reaches the upper edge of the
clamp on the pump. Float switches used in explosive
environments must be approved for this application.
They must be connected to a controller via the
intrinsically safe LC-Ex4 barrier to ensure a safe
circuit.
Warning
Install an additional level switch to ensure that the
pump is stopped in case the stop level switch is not
operating. See fig. 6.
TM06 5741 0316
FM
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