38 | EngliSH
5.3. Start-Up
The mixer must only be started when fully sub-
merged, in order to prevent overheating of the motor.
Any change of mixer position must only be done with
mixer having been switched off and propeller not ro-
tating.
Before start up, check again that all steps of installa-
tion procedure have been properly carried out. Make
sure that the mixer is sufficiently submerged (see
chapter 8+9), and that there are no solid parts in the
tank which might damage the propeller. Furthermore,
it must be ensured that the mixer is immersed at least
half the diameter of the propeller.
Make sure that all necessary safety precautions have
been carried out, e.g. to prevent persons from falling into
the tank. After longer standstill of the mixer, clean the
propeller and motor surface from dried remains of mixing
liquid in order to prevent cooling problems.
5.4. Electrical system
Observe the relevant local and national regulations when
laying out and selecting the electric lines as well as when
connecting the motor. The motor must be protected by
a motor protection switch. Have the motor connected
in accordance with the “Wiring connection” data sheet.
Pay attention to the direction of rotation. 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, are connected 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.
5.5. Motor protection
The minimum requirement is a thermal relay / motor pro-
tection switch with temperature compensation, differen-
tial 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, undervoltage
or phase failure relays, lightning protection). Local and na-
tional regulations must be adhered to when connecting
the machine.
5.6. 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.
5.7. Activation types
Activation types for cables with free ends (without plugs)
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 5.6 of this manual.
5.7.1. After Start-Up
The rated current is briefly exceeded during the start-up
procedure. Once this process has ended, the operating
current should no longer exceed the rated current. If the
motor does not start immediately after the machine is
switched on, it must be switched off immediately. The
start pauses specified in the technical data must be ad-
hered to before starting up again. If the fault recurs, the
machine must be switched off again immediately. The
machine may only be started again once the fault has
been rectified.
The following items should be monitored:
•
Operating voltage (permissible dev/- 5% of
the rated voltage)
•
Frequency (permissible deviation -2% of the rated
frequency)
•
Current consumption (permissible deviation between
phases is a maximum of 5%)
•
Voltage difference between the individual phases
(max. 1%)
•
Starts and stops per hour (see technical data)
•
Minimum water immersion level, level control unit,
dry-run protection
•
Smooth running
•
Check for leaks, if need be, follow the necessary
steps as set out in “Maintenance”
Содержание CHRS.../4 series
Страница 25: ...DEUTSCH 25 Notizen Notes ...
Страница 71: ...Nedlerlands 71 Notizen Notes ...
Страница 75: ...75 ...
