Load Types - Siemens SINAMICS DCM Operating Instructions Manual

Technical data

4.1 Load types

4.1 Load types
For maximum efficiency when adapting the SINAMICS DC MASTER to the load profile for
the driven machine, you can use the load cycle to carry out dimensioning.
Parameter p50067 is used to make the setting on the SINAMICS DC MASTER.
Table 4- 1
Load class
DC I
(p50067 = 1)
DC II
(p50067 = 2)
DC III
(p50067 = 3)
DC IV
(p50067 = 4)
US rating
(p50067 = 5)
NOTICE
 If a value > 1 is set at p50067, you need to make sure that the "Dynamic overload
 The SINAMICS DC MASTER does not monitor whether the load class set using p50067
 The 100 % I
36
Load classes
capability of the power unit" is enabled. This requires a value > 0 to be set at p50075.
is being adhered to. If the power unit permits it, longer overload periods can be used
than correspond to the load class.
The actual permissible overload duration for the particular power unit is always greater
than the overload duration corresponding to the particular load class. and the
SINAMICS DC MASTER does monitor whether the overload duration that is actually
permitted for the power unit is being adhered to. For details on the power unit's dynamic
overload capability, refer to Chapter 10.
shown above DO NOT generally correspond to the rated unit current,
DCx
but are reduced corresponding to the subsequent table.
Load for converter
I continuous (I )
DC I dN
I for 15 mins and
DC II
1.5 × I for 60 s
DC II
I for 15 mins and
DC III
1.5 × I for 120 s
DC III
I for 15 mins and
DC IV
2 × I for 10 s
DC IV
I for 15 mins and
US
1.5 × I for 60 s
US
Operating Instructions, 1.2012, C98130-A7066-A1-05-7619
Load cycle
SINAMICS DCM DC Converter