Siemens SINAMICS G130 Engineering Manual page 358

Sinamics - low voltage sinamics drives
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SINAMICS S120
Engineering Information
Basic Line Modules with diodes
In the case of SINAMICS S120 diode-based Basic Line Modules in frame size GD, which are available as air-cooled
S120 units in Chassis and Cabinet Modules formats, the DC link is precharged by a precharging circuit with resistors,
a process which incurs heat losses. To precharge the DC link, the rectifier is connected at the line side to the line
supply via a precharging contactor and precharging resistors. Once the DC link is precharged, the bypass contactor
(circuit breaker) is closed and the precharging contactor opened again.
SINAMICS S120 diode-based Basic Line Modules: Precharging by means of precharging contactor and precharging resistors
IMPORTANT:
It is absolutely essential that the precharging contactor and the bypass contactor are controlled by the internal
sequence control of the S120 Basic Line Module (precharging contactor via connector -X9:5,6 and bypass contactor
(circuit breaker) via connector -X9:3,4). It is essential that the circuit breaker is opened by an instantaneous release.
For this reason, only circuit breakers equipped with instantaneous undervoltage release may be used.
For S120 Basic Line Modules in Chassis format, the precharging circuit can be implemented either with one
precharging resistor per line phase (as illustrated in the diagram above), or with two precharging resistors connected
in parallel per line phase in order to increase the permissible DC link capacitance of the drive configuration (see
section "Checking the maximum DC link capacitance").
The order numbers, the key technical data and the dimensions of the precharging resistors are stated in the table
below. As described above, a total of 3 or 6 resistors must be installed depending on the magnitude of DC link
capacitance required.
S120 BLM output
at
400 V or 690 V
Frame size
Output
380 V – 480 V 3AC
GD
900 kW
500 V – 690 V 3AC
GD
1500 kW
Dimensions of resistor 6SL3000-0KE12-2AA0 / 2.2 Ω
S120 Basic Line Modules with diodes: Order numbers, technical data and dimensions of precharging resistors
SINAMICS Engineering Manual – November 2015
358/528
Ó Siemens AG
Input current
at
400 V or 690 V
Order number
1630 A
6SL3000-0KE12-2AA0
1580 A
6SL3000-0KH14-0AA0
Precharging resistor
Resistance value
2.2 Ω ± 10 %
4.0 Ω ± 10 %
Dimensions of resistor 6SL3000-0KH14-0AA0 / 4.0 Ω
Pulse load
18000 Ws
18000 Ws

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