15.6
Checking the motor phases
To avoid unde
fi
ned motor activities due to wrong connection, short circuit , broken wires, etc, the
motor phases will be checked during the start procedure. Therefor the current in the phases U/V/W
will be measured before the brakes are opening.
Due to this monitoring function the starting procedure will be extended by 300 ms.By using the factory
setting "Single" and having correct monitoring result only the
fi
rst travel after switching-on the inverter
will be extended.
If during the inspection an error is detected the error message
E412 - MOT:UVW fail
is displayed.
The different monitoring functions can be selected in the menu
ZA-Intern/UVW_CHK
. The factory
setting is "Single".
Function
Description
Single
Motor phases will be check with the
fi
rst travel after switching-on the inverter. With a
successful control no more further examination is made.
If the examination is incorrect, with each start an examination is made until a correct
examination could be accomplished.
Cont
Motor phases will be check with each travel
Off
Checking of the motor phases is deactivated
The testing voltage can be selected in the menu
ZA-Intern/UVW_PEK
an. The factory setting is
"f(P)".
Function
Description
f(P)
The testing voltage depends on the nominal voltage of the motor, which is entered in
the menu
"Motor name plate"
. In case of an error the testing voltage is displayed in
the error message.
1V ... 10V
Selecting the testing voltage between 1 V and 10 V.
In case of an error the testing voltage is displayed in the error message.
15V
Test voltage 15 V.
Error "E412 - MOT:UVW fail" occurs, but the motor connection is correct
If the error "E412 - MOT:UVW fail" occurs even though the motor is connected correct, maybe the
testing voltage is to small. The testing voltage has to be increased manually.
15.7
Field weakening
The operation with
fi
eld weakening is only possible with asynchronous motor.
If the require motor speed for an asynchronous motor n* is above the rated speed n of the motor, the
ZETADYN 3 automatically switches over to operation in the
fi
eld weakening range.
In operation with
fi
eld weakening the magnetizing current I_0 is reduced over the complete speed
range of the motor. The cos phi of the motor data will be increased. Thereby the required speed will be
reached.
The original and the new calculated motor data can be compared in the
Info/page05
menu.
Original operating instructions
ZETADYN 3C
Special functions
R-TBA08_03-GB 1619
Part.-No. 00163322-GB
176/204