Startup
6-2
WILO EMU 3.0
data sheet, check the operating voltage and make certain that the current consumption remains
uniform during all phases.
Make sure that all temperature sensors and monitoring devices, such as the sealing chamber moni-
tor, are connected and that their function is tested. For details on this, see the "Electrical connec-
tion plan" data sheet.
Direction of rotation
The machine must be connected in accordance with the data sheet “Electrical connection plan”.
Rotation direction is controlled by a rotating field tester. This tester is switched on when the pump
is connected and displays the rotation direction of the rotating field. There must be a clockwise
rotating field for the machine to run correctly.
If a counter-clockwise rotating field is displayed, two phases must be swapped.
The pump and performance data specified can only be achieved when
there is a clockwise rotating field. The machine is not designed for oper-
ation with a counter-clockwise rotating field.
Motor protection and
activation types
Motor protection
The minimum requirement is a thermal relay / motor protection switch with temperature compen-
sation, differential triggering and an anti-reactivation device in accordance with VDE 0660 or the
appropriate national regulations. If the machines are connected to electrical systems in which faults
frequently occur, we recommend installing additional protective devices (overvoltage, undervolt-
age or phase failure relays, lightning protection). Local and national regulations must be adhered to
when connecting the machine.
Activation types for cables
with free ends (without plugs)
Direct activation
Motor protection should be set to the rated current when fully loaded. At partial load, we recom-
mend that motor protection is set 5% above the measured current at the operating point.
Star-delta activation
If the motor protection is installed in the line:
Set the motor protection to 0.58 x the rated current. The maximum start-up time in star-delta
mode is 3 seconds.
If the motor protection is not installed in the line:
Set the motor protection to the rated current when fully loaded.
Starting transformer/soft start
Motor protection should be set to the rated current when fully loaded. At partial load, we recom-
mend that motor protection is set 5% above the measured current at the operating point. The
maximum start-up time at reduced voltage (approx. 70%) is 3 seconds.
Operation with frequency
transformers
The machine can be operated on frequency transformers.
Observe the data sheet in the appendix of this manual.
Activation types with plugs /
relays
Units with plugs
Connect the plug to the socket provided and press the On/Off switch on the relay.
Beware of electrical current!
Electrical current can cause fatal injuries if not handled correctly!
All machines with free cable ends (i.e. without plugs) must be
connected by a qualified electrician.
