KEB COMBIVERT F5 Reference Manual page 131

Main Contactor Check (MCC) Input / Output
The MCC Input and Output can be incorporated independently or function in
combination.
MCC Output
The MCC output is used to control the motor contactor. The MCC output
is ON when the drive processes the Direction + Speed input commands
(or direction only for analog and serial speed control modes). As the
contactor closes, the Normally Open (NO) contact on the contactor
should be used to signal the drive enable input.
The MCC output will turn OFF at the end of the run after the Direction
input has been dropped AND the output current has ramped down to
zero; the drive will be in Mode = No Direction (LS) at this point. As the
contactor opens, the Normally Open (NO) contact on the contactor
should be used to drop the drive enable input.
MCC Input
The MCC input function is an active low input used as a qualifier to the
Enable input, indicating the motor contactor has closed. If used, the
input must come from the Normally Closed (NC) auxiliary contact of the
motor contactor; the Normally Open (NO) contact cannot be inverted
for this function. The drive must see the contact is closed while the
system is idle.
MCC Output + Input
When used in combination, the following diagram shows an example
of the connection.
MCC Input
Enable
Direction
Speed
LI - Input Parameters
U
V
W
24VDC
MCC Output
Pilot
Relay
F5
Contactor
Motor
NC
NO
Coil
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