Operation With A Static Frequency Converter; Activation Types - Homa TP 28 Original Instruction Manual

3Phase-Motor
TP 28 and TP 30 pumps with 3Ph-motors are supplied
with a separate control box with motor starter, available
from the HOMA accessory program. 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 nomi-
nal 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 must be designed for operation with the
frequency converter according to DIN EN 60034-17
before order placement. The standard pump is not
suitable for operation with the frequency converter.
• 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.
40 | EngliSH
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
5.10.1. 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 deviation +/- 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)
• Air entry in the infeed, a deflector plate should be fit-
ted if necessary
• 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"