Siemens SINAMICS G130 Engineering Manual page 47

The only exception (until spring 2013) was the Voltage Sensing Module VSM10 (6SL3053-0AA00-3AA0) which
measured the line voltage for S120 Active Infeeds, S120 Smart Infeeds and for SINAMICS S150 cabinet units by
means of high-resistance resistor chains. The insulation resistance for the specified infeeds and cabinet units was
therefore 0.625 MΩ. The upgraded VSM10 Voltage Sensing Module (6SL3053-0AA00-3AA1) in which the power
circuitry is galvanically isolated from the grounded electronic circuitry of the converter has been available since spring
2013. This means that a very high insulation resistance in excess of > 10 MΩ can be achieved with this module even
if a large number of these devices are operated within the same IT system.
Note:
The upgraded VSM10 Voltage Sensing Module VSM10 (6SL3053-0AA00-3AA1) has a connector (X530) via which
the internal voltage sensing circuit can either be connected to or disconnected from ground potential.
In new converter units that are shipped with the new VSM10 (order number ends in 3AA1), the jumper in connector
X530 can be removed during commissioning in IT systems so as to achieve a galvanically isolated voltage sensing
circuit and thus an insulation resistance of > 10 MΩ.
In old converter units in which the new VSM10 (order number ends in 3AA1) is installed as a replacement module
for an old VSM10 (order number ends in 3AA0), the jumper must not be removed from connector X530 for safety
reasons. This is because the interference suppression capacitors must be discharged via the VSM10 module, if in IT
systems the interference suppression filters installed as standard in SINAMICS devices for the "second environment"
are not connected to ground owing to removal of the grounding strap. Consequently, the insulation resistance that
can be achieved in IT systems with the new VSM10 is similar to the value possible with the old VSM10.
The table below lists the insulation resistances of SINAMICS electronics boards which provide a high-resistance
connection between the power unit and grounded electronics as well as the resultant insulation resistances of
complete SINAMICS converters and SINAMICS S120 components.
Electronic circuit / SINAMICS electronics board
Voltage Sensing Module VSM old (until spring 2013)
SINAMICS converter / SINAMICS component
G130 Chassis unit
G150 cabinet unit
S150 cabinet unit
S120 Basic Infeed equipped with thyristors
(all Basic Line Modules sizes FB, FBL, GB, GBL)
S120 Basic Infeed equipped with diodes:
900 kW / 400 V and 1500 kW / 500 V - 690 V
S120 Smart Infeed
S120 Active Infeed
S120 Motor Module
Insulation resistances of SINAMICS electronics boards, SINAMICS converters and SINAMICS S120 components
RFI suppression / RFI suppression filter
When installing or commissioning SINAMICS devices in an IT supply system, the grounding connection for the RFI
suppression filters found as standard in SINAMICS devices and designed for the "second environment" (category C3
in accordance with the EMC product standard EN 61800-3) must be opened. This can be done simply by removing a
metal clip on the filter as described in the operating instructions. If this is not done, the capacitors of the suppression
filters will be overloaded and possibly destroyed by a ground fault at the motor side (see section "Voltage conditions
in normal operation and in the event of a ground fault"). When the grounding connection for the standard RFI
suppression filter has been removed, the devices meet category C4 in accordance with the EMC product standard
EN 61800-3. For more information, refer to the chapter "EMC Installation Guideline".
Fundamental Principles and System Description
Insulation resistance to ground
0.625 MΩ
Insulation resistance to ground
> 10 MΩ
> 10 MΩ
With old VSM: 0.625 MΩ
With new VSM: >10 MΩ
> 10 MΩ
> 10 MΩ
With old VSM: 0.625 MΩ
With new VSM: >10 MΩ
With old VSM: 0.625 MΩ
With new VSM: >10 MΩ
>10 MΩ
SINAMICS Engineering Manual – November 2015
Engineering Information
Remark
High-value resistances
Remark
Value for new VSM applies
when jumper has been
removed from X530
Value for new VSM applies
when jumper has been
removed from X530
Value for new VSM applies
when jumper has been
removed from X530
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Ó Siemens AG