Kemppi Master S 400 Service Manual

Also see for Master S 400: Operating instructions Quick guide

Kemppi Master S 400 Service Manual Manual pdf 20 page image

Service manual Master S 400 and 500 Version 1.1 5.9.201418Kemppi Oy4.2. Semiconductor installationIt is a must be to use torque screwdriver while tightening any power components onto the heatsink. See following sections for tightening torques.4.2.1. Rectifier and IGBT modulesMaster S has soldered rectifier and IGBT modules and it is not possible to change them separately. Onlyreliable way to replace the module(s) is to change the whole Z001 main circuit card.The heat sink paste should be spread on to the modules in an even layer by using fingers. Then the cardshould be immediately mounted onto the heat sink, this minimizes the possibility of any contamination(dirt etc.) getting between the components.The fixing screws for modules are tightened into two stages. First stage ensures proper fastening andsecond ensures the heat sink paste is spread evenly and screws are tight enough. Normally stage 1 isnot the final tightening torque for IGBT module. Between the stages it is recommended to have fewminutes break to let the paste spread.Module Stage 1 torque Stage 2 torqueIGBT 2Nm 3NmBlock diode 2Nm 2Nm4.2.2. Secondary rectifierSecondary diode card is installed similar way as rectifier and IGBT modules but tightening torque is 1,2and should be made in two stages. Heat sink paste must be used.Component Stage 1 torque Stage 2 torqueSecondary diodes 1,2Nm 1,2NmPower rail to positive Dix connector 2Nm 2Nm4.2.3. Secondary power railSpecial actions must be taken while attached aluminium power rail to secondary heat sink and positiveoutput connector. Aluminium creates oxide layer and most of it can be removed with wire brush or sandpaper. By adding heat sink paste to these joints between the surfaces water cannot pass there andcorrosion can be avoided.1. Clean both surfaces carefully2. Use wire brush or rough sandpaper to remove oxide layer from both aluminium surfaces Dix does not need to be brushed because it is made of copper3. Add thin layer of heat sink paste to one of the surfaces4. Attach power rail to heat sink or to dix connector and tight with proper bolt