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EN
I-MAT_Ed6 - Operating Instructions
Page 35 / 164
- The nominal value of the fuse’s rms current which
must be greater than the declared nominal output
current.
-
The temperature derating, therefore possible
oversizing.
- Overload index and service class.
- The rated voltage (>-600VAC).
- The I
2
t value of the fuse used which must be less
than the value indicated in the following table.
Inverter Size
Input Inom
I
2
t (25°C)
MAX A
2
/s
Ampere rating
I-MAT 5,2TT-A
5.2
180
16
I-MAT 11,2TT-B
11.2
250
25
I-MAT 25,8TT-C
25.8
1400
50
I-MAT 65,4TT-D
65.4
7000
100
I-MAT 119TT-E
119
7000
180
6.5.2. Installation of line impedance and
network filters
The input reactor is built-in to reduce harmonic
distortion and to ensure it falls within the declared
category. As well as the built-in input impedance
in the frequency converter (included in the power
range up to 55 kW) it is possible to use external
network impedance to further reduce the harmonic
distortion.
6.6. IT power grid supply configuration
IT power grid supply, is also known as "isolated
ground supply" because the star point of the power
supply is not related to ground. This kind of power
grid supply is to use an insulation controller that
constantly monitors the galvanic isolation between
ground and the various power devices.
The converter is able to work also with this typology
of power grid supply.
If the frequency inverter is to be used in an IT
mains, the relevant IT mains jumpers (identified in
the pictures at paragraph 20.2 called J...).
Contact with live components
Risk of fatal injury due to electric shock!
- Never remove the centre housing part from the
heat sink.
- Mind the capacitor discharge time.
After switching off the frequency inverter, wait 10
minutes until dangerous voltages have discharged.
6.7. Motor connection
Motor cable must be connected directly to the
output terminal board of the frequency converter.
To comply with the EMC standard a
4-pole shielded cable with external shield
protection must be used.
The motor cable must never run parallel to the
power line of the frequency converter
For the electrical connection of each size , refer to
paragraph 20.2.
6.7.1. Length of the motor connecting cables
If the frequency converter is not mounted directly
on the motor longer connecting cables may be
necessary. Using cables that are longer than the
maximum permissible length, it can cause the
internal protections to trip as all the cables have
parasitic capacitance existing between the various
conductors, due to the parallel arrangement and
close proximity to the shield. Depending on the
parasitic capacitance of the connecting cables
high frequency parasitic currents can be induced
through the ground wire of the cables. The cable
Manufacturer provides a technical sheet specifying
the magnitude of the parasitic capacitance for each
meter of length of the cable.
6.7.2. Output filter
If, installation reasons, the length of the cables is
such that the parasitic capacitance exceeds the
maximum permitted value, then a dV/dt filter must
be installed between the product and the motor to
protect against excessive current leakage which
would activate a safety shutdown. In addition, the
filter will reduce the high frequency emissions.
The switching time of the internal IGBT is roughly
5000 V/μS.
Always refer to Table 19.1, for recommended
output filters according to the type and length of the
cables.
The use of high parasitic capacitance
cables can trigger the converter’s rotection.
Always verify that the parasitic capacitance
in accordance with the length of the
connection does not exceed 10 nF (if the
parasitic capacitance value is not available
contact the cable manufacturer for a copy
of the technical sheet). If this requirement
cannot be met then line reactors or output
filters are required to reduce the dV/dt (see
relevant connection table).
Failure to comply with these instructions will
downgrade the product to category C4.
6.8. Transducers connection.
A transducer is an analog instrument with an output
signal of 4-20 mA (or different) that continuously
reads a parameter of the system.
WARNING! Standard transducer cannot be
used in sea water applications.
For some operating modes it is possible to connect
up to 2 transducers:
Constant pressure mode (the difference of pressure
between delivery pipe and suction pipe)
Proportional pressure mode (the difference of
pressure between delivery pipe and suction pipe)
Constant temperature mode (the difference of
temperature between delivery pipe and suction
pipe)
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