Engineering Guide CDA3000
3-81
3 Selection of inverter module
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Speed ratio run Differing motor output speeds can only be attained by using motors
with differing nominal speeds, e.g. 1440 rpm and 2880 rpm. The speed
ratio of approx. 1:2 is maintained during the speed change. The accu-
racy depends on the slip and thus on the load.
Shut-off and acti-
vation of individ-
ual motors
Shut-off of motors, See section 3.2.9
When connecting motors, ensure that the connection current is not
higher than the inverter peak current. It is advantageous if the inverter
load is >40%.
This 40% base load backs up the output voltage of the inverter module
at the moment of connection of the motor.
During connection the motor must not be run in the
field weakening range, since the connected motor
would otherwise have to run at reduced runup torque.
Subject Project planning notes
Table 3.37 Project planning notes for multi-motor operation
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