Igbt Module; Capacitor Bank; Mechanical Door Interlock System - Siemens SINAMICS PERFECT HARMONY GH150 6SL3826 Operating Instructions Manual

Medium-voltage drive

Table of Contents

3.7.4.1

IGBT module

Every IGBT module comprises the following components:

● Two IGBTs

● Control electronics

● Discharge resistors

A branch reactor is located in each phase, between the branch connections and the phase

output. The IGBTs can limit and disconnect a short-circuit current. This means that the drive is

short-circuit proof, that is, a short-circuit will not damage the device but instead will cause the

drive to stop.

For M2C topology, a low-inductance busbar is only required within the power cell. The control

electronics takes its power from the capacitor bank. The gating electronics is mounted directly

above the IGBT modules, and therefore guarantees a compact design with high noise

immunity.

The power semiconductors are connected via the gating electronics. The gating command is

transmitted from the Power Stack Adapter (PSA) to the gating electronics via a plastic fiber-

optic cable connection.

3.7.4.2

For the M2C inverter unit, the capacitor bank represents distributed DC link capacitors; this

means that a central energy storage device (DC link capacitor) is not necessary. The capacitor

bank smooths and stores the energy of the DC link and protects the power semiconductors

against switching overvoltages. It is maintenance free and self-healing.

The drive is switched off when the circuit breaker is disconnected. The capacitor bank is

discharged via the gating electronics and discharge resistors.

3.7.5

The mechanical door interlock system is designed to protect personnel and is an integral part

of the safety concept. During operation all the doors are interlocked (with the exception of the

door for the Control Module).

The mechanical door interlocking system prevents access to the power unit while operational.

The medium voltage supply and auxiliary voltage must be disconnected and locked out so that

the cabinet can be opened. The parameter for the DC link voltage in STARTER must lie below

50 V DC.

Additional information is provided in Section "Opening device" in Chapter "Maintenance".

The device cannot be switched on again until all the doors are closed. For more information on

this topic, see section "Repair" in the "Maintenance" chapter.