7.6.2 Testing

7.6.2 Testing

• Isolate the power supply by switching off the drive power contactor • Keep the auxiliary supply ON. • Using a voltmeter, check the DC Bus to make sure that all capacitors have discharged. Use an adequate meter for a DC level of 2000 V. • Check the error memory in SIBAS and check for the IGBT module related errors.

For diagnoses there are LED’s on HST and DST modules.

These have following functions:

Diagnosis LED on HST

Name Colour Status Information

H11 Green LED glows Control voltage (before Rg)<-2V H21 Red LED glows Control voltage (before Rg)<+2V H31 Yellow LED glows HST power supply ok and no switch off due to short circuit

Diagnosis LED on DST/QST

Name Colour Status Information

H1 Green LED glows Control voltage (before Rg)<-2V H2 Green LED glows Control voltage (before Rg)<+2V H3 Yellow LED glows HST power supply ok and no switch off due to short circuit H4 Red LED glows Fault in HST A10 or A20(Phase L1) LED flashes (2Hz) Braking chopper coded (Phase L1) H5 Red LED glows Fault in HST A30 and A40 (Phase L2, only SD-1500WL)

LED flashes (2Hz) Braking chopper coded (Phase L2, only SD-1500WL)

Note: H1 and H3 will never glow simultaneously H4 and H5 display only HST faults, not the under voltage faults on DST/QST If nothing can be concluded looking at the above mentioned LED’s proceed with the following steps To make it possible to do measurements on the power connectors located in backside of module, the module must be removed from the container. For this, first lock out the main power supply and Auxiliary power supply.

• Dismantle the retaining brackets for the module and disconnect the control shielded cable from both ends (module and cabinet) to prevent any module damage.

Measuring points

Siemens Ltd. A5E01511750J/ 4M-2601-1645240 AC Shovel 295HD/ HR DCC Operation & Maintenance Manual 110