12.96 Maintenance
Siemens AG 6SE7087-6BM70
5-7
SIMOVERT MASTER DRIVES Operating Instructions
5.2.8 Replacing the snubber resistor
♦ Remove the capacitors
♦ Remove the SML- and SMU modules
♦ Remove the module busbars
♦ Release the mounting bolts (2 ×
M5, torque: max. 1.8 Nm) and remove the snubber resistor
♦ A uniform coating of heat conducting paste must be applied to the resistor
Install the new snubber resistor in the inverse sequence.
5.2.8.1 Replacing the IGBT modules
• Replace as for IGD, but additionally
• Remove the mounting bolts of the defective IGBT modules and remove the
IGBT.
• Install the new IGBT module. Observe the following:
− Coat the module mounting surface with a
thin and uniform coating of
heat conducting paste.
− Tighten-up the IGBT module mounting bolts with 3 Nm, observe the
sequence (Fig. 5.3).
1
2
34
5
6
CECE
Tighten-up the IGBT modules
1. By hand (
≈
0,5 Nm),
sequence: 2 - 5 - 3 - 6 - 1 - 4
2. tighten-up with 3 Nm,
sequence: 2 - 5 - 3 - 6 - 1 - 4
Fig. 5.3 Tighten-up IGBT modules
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