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Dc Drive In Crane, DC Regen Drive reliability |
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 Feb 16 2009, 08:18 PM
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#1
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Intermediate Member  Group: Full Member Posts: 12 Joined: 3-April 08 Member No.: 4,452  |
Hi All
We are thinking of putting in a regen DC Drive to a crane for hoisting, travel motions. The supply is from crane collector rails and sometimes, there might be small glitches and blips in power supply since the power supply rails are old and not necessarily flat. I think that since DC Drives do not have any energy storage elements ( Like the DC Capacitors in the AC Drives), momentarily power sag might trip the drive very often and will cause nuisance. So I'm pushing towards replacing the DC motor with AC Motors and AC Drives. Am I right in my assumption? |
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Feb 17 2009, 09:44 AM
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#2
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Posting Freak Group: Moderator Posts: 2,336 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hello rvim002
If you use a DC controller, the output to the motor is pulsed, so a few extra pulses may not have any real affect. The major issue will the the power supply to the controller electronics. Most modern controllers are using switched mode supplies and are able to ride through small supply outages. I would suggest that you talk to your supplier before you take the plunge. For a crane, the four quadrant DC drive takes a lot of beating as it is able to provide full torque down to zero speed and even hold the load without a brake. Best regards, Mark. -------------------- Mark Empson administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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