Lust CDA34.006 - Engineering Note Motor Contactor

CDA3000 Operation Manual
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A.5.1 Engineering note
„Motor
contactor“
In order to prevent an unexpected starting it is necessary to avoid a
dangerous motion at access to the machine according to EN1037 - thus
to provide galvanic separation with a motor contactor in the cable
between inverter and motor.
Basically the switching in the motor cable must always be made in
deenergized condition, otherwise there will be problems of burnt contacts
and a switching off due to overvoltage or overcurrent.
To guarantee a deenergized switching, it is necessary that the contacts of
the motor contactor are closed before enabling the power stage of the
inverter. In the opposite case it is necessary that the contacts are closed
until the power stage is switched-off.
This will be reached by planning corresponding safety time for the
switching of the motor contactor during control sequence or by using the
special software function of CDA3000 inverter.
Software function „Switching of motor contactor“:
Step Action
Example for the digital output OSD01
(terminal plug X2-16/17)
1
Adjust one of the digital outputs of
the inverter to function „ENMO“.
• choose in subject area _240D para-
meter 241_FOS01
• adjust parameter 241_FOS01 to
„ENMO“
• memorize the adjustment
2
Adjust the necessary delay time at
parameter 247_TENMO.
• choose parameter 247_TENMO in
subject area _240D
• choose parameter 247_TENMO app-
lied to your application (factory set-
ting = 300 ms)
• value area = 0 ... 2000 ms