Converter Operation Of Explosion-Proof Machines; Supply Line Configuration - Siemens 1LA8 Operating & Installation Instructions Manual

Preparations for use
4.16 Converter operation
Operation with a converter that is not permissible for the application
If a certain converter type has been defined in the test verification document, on the extra
rating plate, or in the certificate, the machine is only allowed to be operated with this converter.
Death, serious injury, or material damage can result if it is operated with an unauthorized
converter.
● Only operate the motor with the specified converter.
4.16.1

Converter operation of explosion-proof machines

The operation of the explosion-proof machine on the frequency converter is permitted, when
the specifications for the speed control range and torque characteristic are observed, and if
winding temperature monitoring is ensured via the integrated temperature sensors in
conjunction with a tripping unit.
4.16.2

Supply line configuration

NOTICE
Asymmetric voltage load during operation on a TN system in delta connection
An asymmetric voltage load of the machine winding can occur during operation on a TN
system in delta connection with a grounded line conductor. Winding damage can result.
● Do not operate the machine on a TN system with a grounded line conductor.
NOTICE
Ground fault during operation on an IT system
If a ground fault occurs when connected to an IT supply system, the insulation is excessively
stressed. Winding damage can result.
● If possible, complete the process within two hours.
● Rectify the fault cause.
● Deploy a ground fault monitoring.
44
WARNING
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 08/2017