J. T. Eaton Liquid-Cooled Drives LCX9000 - Manual (Page 115)

LCX9000 Liquid-Cooled Drives User Manual
MN04005001E For more information visit: www.EatonElectrical.com A-5
January 2007
DC Link Test (without Motor)
WARNING
There will be dangerous voltages present during this test!
1. Carefully read the safety instructions in the front of this manual and above and follow
them.
2. Connect a variable DC power supply to DC+ and DC- terminals. Make sure that all
polarities are correct.
3. Slowly charge up the DC link to nominal voltage. Allow the system to remain at this
level for at least one minute and check current.
4. If possible, continue increasing the DC link voltage up to the trip limit. Fault F2 (see
Table A-1) should occur at 911V DC (400 – 500V units) and at 1200V DC (525 – 690V
units). Do not increase the voltage over the trip limit.
5. Bring the power supply voltage back to zero. Allow sufficient time for the capacitors to
discharge.
6. Check the DC bus voltage with a multimeter. When you read zero volts, disconnect the
power 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
or longer) allow this voltage to remain for a minimum of 30 minutes — even 4 hours if
time permits.
Through the above test procedure, two things are achieved: 1) It allows the caps to partially
reform due to storage and shipping; 2) It allows any device failures to evidence themselves
with a low power failure.