06.2005 Engineering Information
Siemens AG 6SE7087-6QX70 (Version AE)
SIMOVERT MASTERDRIVES Compendium Motion Control 11-41
The maximum DC link current occurring during motor operation and the
mean DC link current for the inverter have to be determined for later
rating of the rectifier unit. To do this, all power outputs of the motor
within the travel curve first have to be calculated.
♦ Lifting of the load, max. power output of motor during acceleration
P
Mn
kW
Mot b up
Mot b up Mot
max
max
.
.=
⋅
=
⋅
=
9550
16 58 2865
9550
497
♦ Lifting of the load, power output of motor during constant travel
P
Mn
kW
Mot k up
Mot k up Mot
=
⋅
=
⋅
=
max
.
.
9550
1147 2865
9550
344
♦ Lifting of the load, max. power output of motor during deceleration
P
Mn
kW
Mot v up
Mot v up Mot
max
max
.
.=
⋅
=
⋅
=
9550
6 37 2865
9550
191
♦ Lowering of the load, max. power output of motor during
acceleration
P
Mn
kW
Mot b down
Mot b down Mot
max
max
.(
.=
⋅
=
⋅−
=−
9550
4 08 2865)
9550
122
♦ Lowering of the load, power output of motor during constant travel
P
Mn
kW
Mot k down
Mot k down Mot
=
⋅
=
⋅−
=−
max
.(
.
9550
8 39 2865)
9550
252
♦ Lowering of the load, max. power output of motor during
deceleration
P
Mn
kW
Mot v down
Mot v down Mot
max
max
.(
.=
⋅
=
⋅−
=−
9550
12 7 2865)
9550
381
6. Determination of
the DC link
currents