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If the direction of rotation is incorrect, the machine will not
perform as specified, and under certain circumstances,
can become damaged. In accordance with the machine
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 monitor, are con-
nected and that their function is tested. For details on this,
see the wiring diagram.
Beware of electrical current!
Incorrectly performed electrical work can result in
fatal injury. This work may only be carried out by a
qualified electrician.
5.7. Direction of rotation
For 3Ph motors, the direction of rotation must be checked
before commissioning. If a HOMA switch is used with a
rotation direction indicator, this will illuminate if the direc-
tion of rotation is incorrect. The check can be done by
observing the start-back. To do this, place the pump ver-
tically on the ground and turn it on briefly. When viewed
from above, the pump is slightly counter-clockwise when
the direction of rotation is correct.
The correct direction of rotation of the pump is given
when the pump moves counterclockwise, as the motor is
clockwise as viewed from the top.
In the case of pumps already installed, the correct direc-
tion of rotation is checked by comparing the discharge
height and the flow rate with different directions of ro-
tation.
The direction of rotation with the larger discharge height
and flow rate is the correct direction of rotation. If the di-
rection of rotation is wrong, 2 phases of the mains con-
nection must be exchanged. The pumps are supplied
as standard with CEE power plug. The phases are inter-
changed by 180 ° rotation of the round holder plate at the
plug poles with a screwdriver.
The pump and performance data specified can only be
achieved when there is a clockwise rotating field. The
machine is not designed for operation with a count-
er-clockwise rotating field.
5.8. Motor protection
The minimum requirement is a thermal relay / motor pro-
tection switch with temperature compensation,
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, un-
dervoltage or phase failure relays, lightning protection).
Local and national regulations must be adhered to when
connecting the machine.
3Phase-Motor
CTP50, CTP53 and CTP70 pumps with 3Ph-motors must
be connected to a separate control box with motor starter,
available from the HOMA accessory program.
36 | EngliSH
If any other than an original control unit is used, make sure
that the thermal relay in the motor starter is set according
to the nominal current consumption of the pump motor
(see data on pump label).
5.9. Operation with a static frequency converter
The following points must be observed when operating
the converter:
•
The pump is suitable for operation with the frequency
converter according to DIN EN 60034-17.
•
Voltage peaks at the motor winding must be avoided
and, where appropriate, suitable filters must be pro-
vided in the motor lead.
•
The proper grounding of the entire system must be
ensured.
•
The specifications of the frequency converter manu-
facturer must be observed.
•
Under certain circumstances, a shielded cable is nec-
essary to comply with EMC directives.
•
The information sheet „Using HOMA pumps with the
frequency converter" must be observed.
Minimum speed for submersible pumps (wet-well pumps)
For submersible pumps a minimum speed is not required.
Take care that the pump, especial at lower speed, will
work hitch and vibration free. Otherwise the mechani-
cal seals might be damaged and untight. In addition, the
minimum flow velocity of 0.7 m/s must always be met or
exceeded.
5.10. Activation types
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 recommend 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 recommend 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 chapter 5.9 of this manual.
Activation types with plugs / relays
Connect the plug to the socket provided and press the
On/Off switch on the relay
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