Siemens SINUMERIK 840D sl Function Manual page 470

R3: Extended stop and retract
9.2 Control-managed ESR - 840D sl only
This energy is available for a minimum time of t
Example
Assumptions:
● P
● C = C
available capacity is assumed.
● VDC link
● VDC link
This energy is available for a time t
● E = 1440 Ws
● P
● η = 0.9 (assumption)
The following table shows a summary of the values for various SINAMICS infeeds (ALMs).
Whereby, the nominal (C
The total capacitance of the DC link available is made up, taking into account the respective
maximum capacitance C
modules as well as any capacitor modules.
The capacitance specified in the table for the minimum energy content (E
account a component tolerance of -20% (worst case).
Note
It is recommended that the SIZER configuration tool be used to determine the total capacitance
of the DC link available.
470
t = E / P * η
P n
E: Energy in Wattseconds [Ws]
t : Buffer time in milliseconds [ms]
P
P : Power in kilowatt [kW]
n
η: Efficiency of the drive unit
= 16 kW, infeed (ALM) with 3-ph. 380 VAC
n
- 20% = 20,000 µF - 20% = 16,000 µF = 16 * 10
is
= 550 V
alarm
= 350 V
min
E = 1/2 * 16*10 F * ( (550 V)
-3
= 16 kW
n
t = 1440 Ws / 16 kW * 0.9 = 81 ms
Pmin
) and minimum (C
max
(charge limit), from the capacitances of the infeed (ALM), the motor
max
:
min
F, for safety, a 20% lower effectively
-3
- (350 V) ) = 1440 Ws
2 2
, e.g. for a retraction:
min
) capacitance are taken into account.
min
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
for C ) takes into
min min
Special functions