Danfoss MPE 70, Operating Manual

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Operating guide | MPE 70
18
180R9426 | AQ367027814446en-000801 | IOM MPE 70 | 08.2022
7.7 Motor and frequency converter
7.7.1 Electric motor
The MPE 70 must only be driven by an
electric motor.
The rotation speed on the electric motor
must be controlled by a VFD. The direction
of rotation can be seen on the identification
label.
ERD
Type MPE 70
Code no. 180F7070
Serial no. XXXXXX01-XXX
MADE IN DENMARK
Danfoss A/S, 6430 Nordborg, Denmark
When connecting to the power supply,
check the direction of rotation. The rota-
tion can only be checked with water con-
nected and the transit screw removed.
This can be made by either:
1. Looking at the fan in the end of the
electric motor.
2. Removing the plug in the bell housing
and watch the rotation of coupling.
3. Before assembling the MPE 70 on the
electric motor, check the rotation of the
shaft.
Using anything other than an electric
motor can lead to an irreparable frac-
ture of the MPE 70’s internal parts.
Special attention has to be on NON
PROTECTED - FREE ROTATING shaft on
the electric motor. Ignorance will or
could result in personal injury.
Running the MPE 70 in the wrong
direction for more than a few minutes
can cause un-intended wear on the
MPE 70.
If the electric motor is running at
a lower speed, extra care must be tak-
en to ensure that the electric motor
is NOT overheated. External cooling
may be necessary.
7.7.2 Starting torque for the MPE 70
Because of the inertia and stick-slip friction
of the MPE 70 internal parts, the motor must
be able to provide the specified torque.
Once the MPE 70 is turning the torque will
drop to the operating torque specified for
the MPE 70.
7.7.3 Frequency converter
The frequency converter Must be able to
operate at constant torque over the whole
range of speeds. A special attention should
be taken when dimensioning the Frequency
drive for the MPE 70. The drive must be able
to provide start current enough for the mo-
tor to start. The start current can be found in
the data sheet see apendix 11.1.
If more electric motors are powered by the
same VFD, each electric motor must be
equipped with “torque limit equipment” to
protect the MPE 70 against overload.
The electric motor must always be
protected against overload.