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Electrical connection
6.6 Converter operation
6.5.5
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
6.6
Converter operation
Dangerous voltage via the converter
As long as the feeding converter is switched on, or the DC link of the converter is not
discharged, there can be a voltage at the motor terminals even when the rotor is not moving.
The voltage is up to 1000 V, depending on the converter type.
Ensure that the five safety rules (Page 13) are followed before working on the motor.
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– 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 119)" for the tightening torque of
the fixing bolts for the cover.
WARNING
SIMOTICS HT Series HT-direct 1FW4...1......A
Operating Instructions 11/2018
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