1 Rapid Link 5 system
1.6 Selection criteria
Rapid Link 5 · RAMO5 · RASP5
05/20 MN034004EN
www.eaton.com
29
1.6.1 Special features of 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
speed controllers, but will normally require additional engineering,
modification of the various parameters, and detailed information from
the motor manufacturer.
•
Only use motors that have insulation class F (maximum steady state
temperature of 155 °C ) at least.
•
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.
•
In the case of undersized motors, the motor output should not be more
than one rating level lower than the rated rating level (in order to ensure
that the motor will be protected).
Set Frequency control (V/Hz) mode if the motor output is significantly
lower.
1.6.2 Synchronous, reluctance, and PM motors
RASP5 speed controllers enable three-phase motors to be operated with
maximum energy efficiency, e.g.:
•
Efficiency rating 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 opera-
ting point and identical efficiency classes, but also have significant differen-
ces when it comes to their startup behavior and partial-load operation.
The data on the rating plates also differs significantly from the usual data,
e.g. 315 V, R
20*
= 2.1
Ω
, L* = 20 mH and U
Pol
= 195 V / 1000 rpm
￫
Check whether your selected RASP5 speed controller and the
associated three-phase AC motor are compatible with each
other with regard 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.