Connections And Interference Suppression - Siemens SINAMICS G110M Getting Started

Thermal stability of the system
The SINAMICS G110M system is comprised of a motor and a converter which are
designed to work together. The system can generate a significant amount of heat which
can affect the performance of your application.
If the duty cycles of the system are not calculated properly, it could result in your application
not working efficiently and produce nuisance trips from overtemperature faults.
To ensure the thermal stability of the system, duty cycles should be calculated using the
lowest rated component of the system - this should be either the motor or the converter
depending on the your application.
NOTICE
Line impedance
To ensure trouble free operation we recommend the mains supply impedance is less than
1% (RSC > 100).
NOTICE
UL transient surge suppression requirements
To ensure that the electical installation of this equipment complies with the UL requirements
for transient surge protection, the following requirement must be strictly adhered to:
Transient surge suppression shall be installed on the line side of this equpment and shall
be rated 480 v (phase to ground), 480 v (phase to phase), suitable for overvoltage category
III and shall provide protection for a VPR maximum of 2 kv, type 1 or type 2 SPD
application.
Note
Optional 24 V PSU loss of power
The optional 24 V PSU derives power from the mains supply to the converter. Should the
mains supply be removed from the converter, the 24 V PSU will not longer provide power to
the control and communications components of the
converter.
3.3.2

Connections and interference suppression

All connections should be made so that they are permanent. Screwed connections on
painted or anodized metal components must be made either by means of special contact
washers, which penetrate the isolating surface and establish a metallically conductive
contact, or by removing the isolating surface on the contact points.
Contactor coils, relays and solenoid valves must have interference suppressors to reduce
high-frequency radiation when the contacts are opened (RC elements or varistors for AC
SINAMICS G110M Getting Started
Getting Started, 09/2014, FW V4.7, A5E31298643B AC
CAUTION
Installation
3.3 Electrical Installation
51