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
3
4
5
6
C
E
C
E
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
