Instructions For Operation And Use - Herz MD10 Notice D'utilisation

The wire running between the motor and
•
the frequency converter must not exceed
a length of 20 m, configured as a
suitable, shielded cable and laid by as
direct a route as possible, without any
additional plug/clamp connections.
The braided screen in the connecting
•
cable must cover the full length of the
∗
cable on both sides, i.e. be connected to
the earthing system at the frequency
converter and to the motor using a low
electrical resistance. For this purpose,
suitable EMC cable couplings must be
used on the motor side. They must
contact the cable shield around its full
circumference
resistance.
For further information about EMC compliant installation and
assembly, refer to the Operating and Assembly Instructions
issued by the frequency converter manufacturer.
3.2.1 Confi guration for three-phase current blowers
Checking the direction of rotation
Switch on the blower. The running direction of the impeller
should correspond to the direction arrow on the housing. If the
impeller rotates in the wrong direction, then interchange L1 and
L3.
3.2.2 Configuration for single-phase a.c. blowers
3.3 Special configurations and additional clamps
Terminal diagrams can be found in the motor terminal box for
voltage interchangeable motors, pole-changeable motors, FU
motors and other special configurations of threephase a.c. and
a.c. motors. This also applies to the optional thermal winding
protection and the space heater.

4. INSTRUCTIONS FOR OPERATION AND USE

4.1 Basic information
Please observe the notes on designated use in section 1.1, as
well as the safety guidelines in sections 1.2 to 1.10.
If electrical current drops below the rated current of the drive
motor during operation, check to see if the mains voltage and
frequency match the appliance ratings (nameplate).
After protective shutdowns,
circuitbreaker, activation of the PTC evaluation unit by motors
with a PTC resistor sensor, or after a protective shutdown of the
BA MD10MD14 V20 R14 10_2017 EU long.doc
and have a low
e.g. tripping of the motor
frequency converter during FU applications, the appliance must
not be restarted until the problem has been identified and
eliminated.
If the blower cannot be operated over the whole range of the
characteristic curve, the motor may overload if the system
resistance is too low (excessive current consumption). The
volumetric air fl ow should be reduced in this case by means of a
throttle valve fi tted on the intake or discharge side.
The blower must not be subjected to vibration or impact loads.
4.2 Frequency converter operation
A frequency converter is used, allowing a wide range of speed
adjustments. There is only a small, load-related difference in rpm
between idle state and the max. load of the blowers.
To ensure trouble-free operation of the blowers, it is
important that the converter
requirements:
Converter output equal to or greater than motor power
•
output *)
Converter current equal to or greater than motor
•
current *)
Converter output voltage equal to rated motor voltage
•
The pulse frequency of the converter should be 8 kHz,
•
since a lower pulse frequency can cause very noisy
motor operation.
The converter should have a connection for a
•
temperature sensor (PTC resistor sensor) or a
temperature switch (normally-closed contact)
*) Refer to the rating plate for data
The motor can be operated in a delta or star-point configuration,
depending on the input voltage of the converter.
The following U/f assignments must be confi gured at the
converter.
If this is ignored, the
disproportionately and the drive motor will fail to achieve its rated
speed.
Note!
Do not set the converter to a higher frequency
(rpm) than the frequency (fB) specified on the
nameplate, because this can overload the motor or
irreparably damage
overspeeding. Similarly, a so-called "boost" must
never be set at the converter because this would
result in excessive heating of the drive motor. The
temperature sensors must be connected to the
relevant converter inputs in order to protect the
drive motor.
unsuitable for converter operation.
∗
To ensure safe and trouble-free operation, the
installation and safety instructions provided by
the frequency converter supplier in the operating
or application manuals must be strictly adhered
to.
Please note also
conditions, heavy soiling of the cooling fins can
occur in FUK-compliant appliances. If the cooling
capacity of the cooling fi ns is insufficient, the
frequency converter will shut down. Appliances
which are operated in these environments must be
inspected on a regular basis.
meet the following
motor current will
the blower due
Single-phase a.c. motors
that, in certain
increase
to
are
ambient
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