Testing The Inverter Without Dc Link Voltage (Simulation Mode); Preparatory Measures; Simulation Mode - Siemens SIMOVERT MV Series Commissioning Instructions

4.2.10

Testing the inverter without DC link voltage (simulation mode)

4.2.10.1

Preparatory measures

In order to prevent the DC link becoming live when in the simulation mode, the
circuit-breaker must be locked-out so that it cannot be closed. If necessary, the
circuit-breaker should be withdrawn!
Further, switch Q140 must be opened, so that the DC link cannot be pre-charged.
The DC link/inverter is still charged-up to approx. 100 V DC due to the power
supply of the IGBT gating modules!
4.2.10.2

Simulation mode

The inverter can be operated via a setpoint generator block (refer to Section
4.2.10.3) in the function package TRV without a DC link voltage. Operation without
DC link voltage, can, under fault conditions, be used to test the gating circuits of
the IGBTs. An operating mode selection is necessary in order to implement this
function. The selection is made in the WRS function package at block B60.X.
Three different operating modes can be selected.
1. B60.X
2. B60.X
3. B60.X
The SWG operating mode without excitation is selected by entering a "4" at block
B60.X. As the first test is made without DC link voltage, i.e. the power-on cascade
with its checkback signal is missing, the inverter must be controlled directly via
blocks S10.I2 (inverter enable) and S20.I8 (inverter inhibit) in function package
EAL1.
Closed-loop controlled operation is selected, at block SWG, in function package
TRV via connector SWG.IRM. A frequency setpoint can be input at connector X of
block SWG50. The inverter is enabled via S10.I2 in FP-EAL1. The inverter now
clocks the semiconductor devices. The inverter can be inhibited via S20.I8 in FP-
EAL1. In this case, it should be observed, that the commands via connectors
S10.I2 and S20.I8 represent a set- and a reset command. When the inverter
enable is withdrawn, the inverter is not automatically inhibited.
It is only permissible to enable the inverter via these two blocks for test purposes.
Siemens AG 6SE8004-0BH76
SIMOVERT MV Commissioning Instructions
2 Standard operation, Transvektor control active
4 SWG without excitation, service
5 SWG with excitation, service
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