4.15 Converter operation
The following chapter is relevant only to machines of series 1PQ8 or if the machine was ordered
for operation on the rectifier.
Note
The order number shows whether the machine was ordered for operation with converter: the
9th digit of the order number features the letter "P" or "Q".
4.15.1 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.
4.15.2 Converter input voltage
The insulation system of SIMOTICS machines significantly exceeds the requirements of stress
category C (IVIC C = high stress). If voltage peaks higher than those specified according to
IVIC C can occur, then observe the data in the respective Catalog (http://w3app.siemens.com/
mcms/infocenter/content/en/Pages/order_form.aspx):
● For a line voltage (converter input voltage) up to max. 480 V and operation connected to a
SINAMICS G / SINAMICS S converter with uncontrolled/controlled infeed: Comply with the
guidelines for configuring motor and converter.
● For line voltages (converter input voltages) higher than 480 V, motors, which are ordered
for converter operation, have an appropriate insulation system.
● Operation with a converter from another manufacturer: Comply with the permissible voltage
peaks according to IEC 60034-18-41 in accordance with stress category C, dependent on
the particular line voltage (converter input voltage) and the motor insulation system.
Preparations for use
4.15 Converter operation
SIMOTICS TN Series N-compact 1LH8
Operating Instructions 06/2017 37
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