Siemens simovert masterdrives Compendium

06.2005 Engineering Information
Siemens AG 6SE7087-6QX70 (Version AE)
SIMOVERT MASTERDRIVES Compendium Motion Control 11-43
The maximum braking power and the mean braking power have to be
determined for later rating of the braking resistors. The maximum motor
power output during braking has already been calculated in 6.
♦ The maximum braking power is thus:
PP kW
br Mot v down Mot Invmax max
... .=⋅⋅=−⋅⋅=−
η
η
381 089 098 332
♦ The mean braking power is obtained from the negative
characteristic of the motor power output as follows:
P
br mean
=
+
⋅
⋅⋅
∑
PP
t
T
Mot v A Mot v E
i
Mot Inv
2
∆
ηη
=
⋅− ⋅ +− ⋅ + ⋅− ⋅
⋅⋅=−
1
2
122 0 6 252 0 3
1
2
381 06
7
089 098 028
(.). (.). (.).
.. .kW
11.9.4 Selection of the rectifier unit
Now that the drives of the x, y and z axes have been calculated, the
rectifier unit can be selected. Here, it is assumed that the drives of the x
and z axes can operate simultaneously.
♦ The maximum DC link currents of the two inverters during motor
operation are therefore added together.
II AAA
Link ct Link InvRe max max
...==+=
∑
14 56 1055 2511
♦ In order to determine the mean value of the DC link current, the
mean values of the two inverters are added together.
II AAA
Link ct mean Link Inv meanRe
.. .==+=
∑
0 95 0 938 189
♦ The 15 kW rectifier unit, 6SE7024-1EP85-0AA0, with I
ZK n
=41 A is
sufficient.
IA
Link ctRe max
.= 2511
<
16 656..⋅=IA
Link n
IA
Link ct meanRe
.= 189
<
IA
Link n
= 41
7. Determination of
braking power

Siemens simovert masterdrives Specifications

General

Brand	Siemens
Model	simovert masterdrives
Category	DC Drives
Language	English