Eaton Rapid Link RAMO5, Manual

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1 Rapid Link system 5
1.6 Selection criteria
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Rapid Link 5 · RAMO5 · RASP5 10/19 MN034004EN www.eaton.com
1.6.1 Special features of the motor selection for RASP5
Observe the following general recommendations for motor selection with a
RASP5 speed controller:
• Use three-phase induction motors with squirrel-cage rotors and surface
cooling – also referred to as three-phase asynchronous motors or stan-
dard motors. Other types of motors, such as external rotor motors,
wound rotor motors, reluctance motors, permanent magnet motors,
synchronous motors, and servomotors can also be run with RASP5
variable frequency drives, but will normally require additional engineer-
ing, modifying the various parameters, and detailed information from the
motor manufacturer.
• Only use motors of at least class F temperature rating
(155 °C maximum constant temperature).
• Take the operating conditions into account for S1 operation
(IEC
60034-1).
• Do not oversize the motor, i. e., the motor should not be more than one
rating level higher than the rated motor output.
• With undersizing, the motor output may only be one output level less
than the allocated output level (to ensure the motor protection).
With significantly smaller motor output, the “frequency control U/f)”
operating mode must be set.
1.6.2 Synchronous, reluctance, and PM motors
The RASP5 speed controllers enable the operation of three-phase motors
with maximum energy efficiency, such as:
• Efficiency classes IE3 and IE4
according to IEC/EN 60034-30, EU No. 4/2014,
• Permanent magnet motors (PM motor),
• Synchronous reluctance motors (SynRM),
• Brushless DC motors.
These motor technologies have comparable efficiencies at their rated operat-
ing point and identical efficiency classes, but also have significant differences
when it comes to their startup behavior and partial-load operation.
The rating plate details also differ with, e. g., the rating plate details, e.g.
315 V, R
20*
= 2.1 Ω , L* = 20 mH and U
Pol
= 195 V / 1000 min
-1
also differ
significantly from the usual details.
￫
Check whether your selected RASP5 speed controller and the
associated three-phase AC motor are compatible with each
other according to voltage (mains and motor voltage) and rated
current.
￫
For information on and examples for permanent magnet and
brushless DC-motors, please refer to application note
AP040051EN.