17
10. Electrical connections
All electrical connections must be carried out by a
qualified electrician.
The mixer is supplied complete with connection to
mains. The core code numbers are indicated along the
corresponding cores (s. Connection diagram) or as other-
wise indicated.
Before connecting the motor, the actual operating
voltage must be compared with the voltage data on the
motor specification plate and the motor switching:
- When the voltage stated is 230/400 volts, the motor must
be connected in star configuration.
- When the voltage stated is 400/690 volts, the motor must
be connected in delta configuration.
The voltage of the mains power supply must match the
voltage stated on the type plate.
After making the electrical connections, ensure that the
mixer blades are rotating in the correct direction. (When
viewed from the motor, the blades must rotate clockwise.)
If the mixer blades rotate in the wrong direction, two of the
three conductor phases (L1, L2, L3) coming directly from
the mains power supply must be changed over.
The three conductor phases (L1, L2, L3) must not be
confused with the neutral conductor (N) or the earth
(ground/PE) conductor.
Do not transpose any of the conductors that come from
the motor (U1, V1, W1, or U2, V2, W2) on the terminal
board. If this is done, they will no longer match the Y-Delta-
starting controls.
Motor Protection
The motor is protected against overheating by an integral
protection device. This is a thermal winding protection sys-
tem covering all three stator windings.
The temperature is monitored by three bi-metallic switches
which cause the mixer to be switched off when the maxi-
mum temperature in the windings is reached.
After the windings have cooled down to below this tem-
perature, the bi-metallic switches close, and the mixer can
be restarted either automatically or manually.
(The insulation of the stator windings will be damaged at a
temperature of 160 °C.)
Connection Diagram
Overload relays
The motor is to be protected against overload through a
thermal delay relay according to NIN. This is to be adjusted
to the rated current indicated on the machine plate.
In addition, the mixer must not run outside the medium
(dry), as the motor will heat up and may be damaged.
The submersible may be adjusted only in switched off
condition.
11. Start Up
The mixer can only be commissioned when the checks in
this chapter have been made and its made sure, that there
are no solid objects in the mixing tank.
Also it must be made sure that the mixer is at least so far
submerged that half the diameter of the propeller is cov-
ered.
Further it must be made sure that no person can involun-
tarily fall into the mixing tank or basin. The foreseen pro-
tection (covers, railings, etc.) must have been mounted.
While a longer downtimes period of the submersible mixer
outside the basin it should be cleaned from dried agitating
medium before restarting operation. Otherwise an impair-
ment of the natural cooling during operation is possible.
T1 U1
U2
W2
W1
V
V
T2
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