Terminating The Connection Work (Auxiliary Circuit); Converter Operation; Operation On A Converter With A Low Pulse Frequency - Siemens 1LA8 Operating Instructions Manual

6.5.4

Terminating the connection work (auxiliary circuit)

1. Before closing the auxiliary terminal box, please check that:
2. Close the auxiliary terminal box using the cover supplied for this purpose. See section
6.5.5

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".
6.5.5.1

Operation on a converter with a low pulse frequency

NOTICE
Increased motor temperature
If the pulse frequency is less than the rated pulse frequency, then increased motor losses
occur. This results in a higher motor temperature.
● Reduce the power to prevent exceeding the temperature class and to avoid consequential
● Contact the Service Center if necessary.
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 05/2016
– The cables are connected in accordance with the terminal diagram.
– The cables are freely arranged so that they cannot come into contact with the machine,
and the cable insulation cannot be damaged.
– The inside of the terminal box is clean and free of any cable debris, dirt and foreign
bodies.
– The cable glands are firmly tightened, are suitable with respect to the degree of
protection, type of cable routing, permissible cable diameter, etc., and have been
mounted in full compliance with specifications and regulations
– The threads in the connection plate are sealed using cable and conductor entries, thread
adapters or sealing plugs that achieve the respective degree of protection.
– Unused cable entries are sealed. The sealing elements are firmly screwed in, and can
only be released using a tool.
– All of the seals/gaskets and sealing surfaces of the terminal box are in good condition
– The screws of all of the screw clamps are fully tightened, even if they are not being used.
"Tightening torques for screw and bolt connections (Page 139)" for the tightening torque of
the fixing bolts for the cover.
premature thermal aging of the insulation.
Electrical connection
6.5 Connecting the auxiliary circuits
77