Siemens SIMOVERT MASTERDRIVES Manual page 898

06.2005
6. Determination of
the DC link
currents
Siemens AG 6SE7087-6QX70 (Version AE)
SIMOVERT MASTERDRIVES
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
M
Mot b up
=
P
Mot b up max
♦ Lifting of the load, power output of motor during constant travel
M
Mot k up
=
P
Mot k up
9550
♦ Lifting of the load, max. power output of motor during deceleration
M
Mot v up
=
P
Mot v up max
♦ Lowering of the load, max. power output of motor during
acceleration
M
=
P
Mot b down max
♦ Lowering of the load, power output of motor during constant travel
M
Mot k down
=
P
Mot k down
♦ Lowering of the load, max. power output of motor during
deceleration
M
=
P
Mot v down max
Compendium Motion Control
⋅
n
16 58 2865 .
Mot max
=
9550 9550
⋅
⋅
n
1147 2865 .
Mot max
=
9550
⋅
⋅
n
6 37 2865 .
Mot max
=
9550 9550
⋅
n
4 08
Mot b down Mot max
=
9550
⋅
n
8 39 .
Mot max
=
9550 9550
⋅
n
12 7
Mot v down Mot max
=
9550
Engineering Information
⋅
=
4 97 . kW
=
3 44 . kW
=
191 . kW
⋅ −
. ( 2865)
= −
122 . kW
9550
⋅ −
( 2865)
= −
2 52 . kW
⋅ −
. ( 2865)
= −
3 81 . kW
9550
11-41