FAULT TRACING vacon • 14599.3 DC link test (without motor)NOTE! There will be dangerous voltages present during this test!1. Read carefully the safety instructions in Chapter 1 and follow them.2. Connect a variable DC power supply to DC+ and DC– terminals. Make sure that allpolarities are correct.3. Slowly charge up the DC link to nominal voltage. Allow the system to remain at this levelfor at least one minute and check current.4. If possible, continue increasing the DC link voltage up to the trip limit. Fault F2 (seeChapter 9) should occur at 911 VDC (NX_5, 400…500-volt units), at 1200 VDC (NX_6,525…690-volt units) and 1300 VDC (NX_8, 525...690-volt units). Do not increase thevoltage over the trip limit.5. Bring the power supply voltage back to zero. Allow sufficient time for the capacitors todischarge.6. Check the DC bus voltage with a multimeter. When you read zero volts disconnect thepower supply and reconnect all wires to the phase module.7. If the phase module has been de-energized for an extended period of time (six months orlonger) allow this voltage to remain for a minimum of 30 minutes – even 4 hours if timepermits.Through the above test procedure, two things are achieved: 1) It allows the caps to partially reformdue to storage and shipping; 2) It allows any device failures to evidence themselves with a low powerfailure.Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
