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Frame size Enclosure grounding method
132 ... 355 Cable connection with free cable
The additional threaded hole on the grounding socket is optionally available for additional
equipotential bonding of high-frequency voltages and currents in converter operation.
Internal ground terminal
When making connections, ensure the following:
● Ensure that the connecting surface is bare and is protected against corrosion using a
suitable substance, e.g. acid-free Vaseline.
● Arrange the flat washer and spring washer under the bolt head.
● Locate the cable lug under the clamping bracket.
● Use the terminals designated for the grounding conductor in the terminal box.
● Observe the tightening torque for the locking screw.
External ground terminal
When making connections, ensure the following:
● Ensure that the connecting surface is bare and is protected against corrosion using a
suitable substance, e.g. acid-free Vaseline.
● Position the cable lug between the contact bracket and the grounding bracket; do not
remove the contact bracket pressed into the enclosure!
● Arrange the flat washer and spring washer under the bolt head.
1MB155 / 1MB555
Operating Instructions, 03/2018, A5E41926185A
Cable connection with grounding strap
Cable connection with cable lug
(DIN 46234; JB/T2436.1)
Electrical connection
6.4 Connecting the grounding conductor
73
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