Lust CDA3000 - Switching at the Inverter Output

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Engineering Guide CDA3000
3 Selection of inverter module
3.2.9 Switching at the
inverter output
The motor connected to the inverter may be isolated by means of a con-
tactor or motor circuit-breaker. It is not possible to damage the CDA3000
inverter module by shutting down the motor.
When motor loads are shut off very high switching overvoltages
occur, because the inductance of the motor does not permit stepped
current changes. These switching overvoltage may also lead to fault
shutdowns and/or error messages from the inverter, depending on
the drive configuration. In such cases a motor choke must be inser-
ted - see section 6.2.
Figure 3.6 Circuitry example “Switching at the inverter output”
Multi-motor operation
Several motors can be run in parallel on one CDA3000 inverter module. In
this application case motors not only need to be shut down, but also acti-
vated. For details of the operating conditions under which such cases
apply refer to section 3.3.6.
M
3
~
K2
+
-
UV
W
PE
L1
L2
L3
PE
L1
L2
L3
PE
F1
K1
L1
M1
CDA3000