Lenze 931W - Manual (Page 21)

Technical data
Rated data
Rated data for S3 operation/overload capacity
3

21 GHB 13.0002-EN 3.1
3.3.6 Rated data for S3 operation/overload capacity
For the dimensioning of a drive system which is operated in S3 operation, the effective
motor torque is to be calculated. The effective torque results from the kinematics (travel
profile) and the time-dependent load profile in consideration of the gearbox ratio,
efficiency, friction lossses, etc.. It can be calculated in a simplified manner according to the
following equation, where T represents the period of a cycle and Mi the motor torque to
be reached in the time t
i
. Furthermore, a dynamic factor k
dyn
is to be considered, which -
depending on the dynamic of the load profile - can reach values between 1 (low dynamic)
to 1.2 (high dynamic / strong stabilisation processes). For calculating the effective torque,
or for dimensioning drive systems, the ”Drive Solution Designer” program can be used.
M
eff
=

t
i
⋅ M 2
i
T

⋅ k
dyn
≤ M
rated
The drives of the 930 fluxxtorque product range are checked with regard to the S3
operating mode according to the load profile represented in diagram 1. The load profile
travelled at rated speed (cycle time: 5 s) is composed of a peak load of 0.5 s (150 % M
rated
)
and a recovery time of 4.5 s (75% M
rated
).
0.5s 4.5s
T
M
100 %
75 %
150 %
Fig. 1 Overload capacity of the drive at 40°C
Type SDSGSSR35 SDSGSSR47 SDSGSSR56
S3 operation
Supply voltage [V]
24 * 42 42 * 230 320 230 320
Rated torque [Nm] 0.45 0.45 0.80 0.80 0.80 1.40 1.40
Max. load torque (15%) [Nm] 0.68 0.68 1.20 1.20 1.20 2.10 2.10
Recovery torque (75%) [Nm] 0.34 0.34 0.60 0.60 0.60 1.05 1.05
* The information is based on a reduced speed (1000 U/min).