5. Connect the shields of shielded cables to ground on the transformer or the motor. Do not
connect the power cable shields at the converter side.
6. Fix the power cables from behind to the front. The connection busbars are labeled with the
phase designation.
7. Seal the floor panel and the cables passing through the panel so that they are air-tight.
NOTICE
Inadequate cooling
Unless the floor panel is air-tight, adequate cooling cannot be guaranteed. As a
consequence, converter components overheat.
Seal any access holes made in the floor panel immediately after installation so that they
are air tight, in order to ensure sufficient cooling.
6.10.2 Connecting the signal cables
There are terminal strips and interfaces on the Power Stack Adapter in the electronics
compartment of the power unit. The signal traffic to the open-loop and closed-loop control
cabinet is handled via these interchange points.
The terminal blocks are used to wire up the following:
● Signals
● Auxiliary voltage for fans and anti-condensation heating systems
● Power supply for the electronics
Procedure
To connect the signal lines, proceed as follows:
1. Connect the signal lines at the intended clamping points.
2. Connect the shield to the shield bus as shown under Using the equipotential bonding strip
and shield bus (Page 79). Refer to the "Circuit manual for power unit" for the precise
assignment. Pay attention to the EMC directives.
Electrical connection
6.10 Connecting the power unit
SINAMICS GL150 6SL38503UM114PA0Z
Operating Instructions 04/2017 83
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