Capacitor Bank; Door Limit Switch; Electromechanical Door Interlocking System - Siemens SINAMICS SH150 Operating Instructions & Installation Instructions

● 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
converter is short-circuit proof, that is, a short-circuit will not damage the device but instead will
cause the converter 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.
3.8.5.2

Capacitor bank

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.
3.8.6

Door limit switch

Door limit switches monitor the doors. The circuit breaker opens when a door is opened.
3.8.7

Electromechanical door interlocking system

The electromechanical 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 electromechanical door interlocking system prevents access to the power unit while
operational. The following conditions must be fulfilled in order to open the doors. You can open
the doors once released by the control.
For more information see section "Opening device" in the "Maintenance" chapter.
The device cannot be switched on again until all the doors are closed. The doors remain
interlocked if the auxiliary voltage fails. For more information on this topic, see section "Repair"
in the "Maintenance" chapter.
SINAMICS SH150 6SL3805
Operating Instructions 05/2020
Description
3.8 Components
35