2 Engineering
2.12 Motor and application
Rapid Link 5 · RAMO5 · RASP5 05/20 MN034004EN www.eaton.com 69
2.12 Motor and application
2.12.1 Motor selection
General recommendations for motor selection:
• Basically, three-phase AC motors with squirrel-cage rotors and surface-
cooling (also know as three-phase asynchronous motors or standard
motors) can be connected to the output of RAMO5 and RASP5
Rapid Link modules. Other motor types, such as external-rotor motors,
slip-ring motors, reluctance motors, or synchronous or servo motors can
also be connected provided their electrical and connection characteris-
tics are the same as those of asynchronous motors and their manufactu-
rer has approved them for the application.
• Only one motor with at least temperature class F (155 °C maximum
continuous temperature) should be operated on the frequency-controlled
RASP5.
• Four-pole motors should preferably be selected (synchronous speed:
1500 rpm at 50 Hz or 1800 rpm at 60 Hz).
• Operating conditions for S1 operation according to IEC 60034-1.
• The rated current of the motor and RAMO5
or
RASP5 should be identical.
2.12.2 Motor and circuit type
The motor’s stator winding can be connected in a star or delta circuit as per
the rated operational data on the name plate.
Figure 28: Example of a motor ratings plate
Figure 29: Circuit types:
Star-connected circuit (left), delta circuit (right)
A three-phase motor with the rating plate shown in Figure 28 can only be run
in a star connection for RAMO5 (U
LN
= 400 V).
The rated operational current of the motor with 2 A at 400 V requires a
Rapid Link module (RAMO5 or RASP5) with a rated operational current of at
least 2 A.
/ 400 V230
3.5 / 2
0,75S1
0.79
φ
cos
kW
rpm
1430 50 Hz
A
U1 V1 W1
W2 U2 V2
U1 V1 W1
W2 U2 V2
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