2/9/2010 8:38 PM | |
Posts: 16 Rating: (0) |
please anyone clear me |
2/10/2010 3:18 AM | |
Joined: 6/4/2008 Last visit: 9/15/2024 Posts: 1497 Rating: (324) |
Hi, Capacitors, if left for more than 1 year without power tend to degrade (recoverable) to a point that they may possibly explode (it does happen) if a full DC voltage is suddenly applied. The capacitor reforming circuit gently re-introduces the capacitors to voltage, you leave the forming unit attached 1 hour for every year without power. Please see the attached document (section 6) for more info and if you wish to make one. The pre-charging resistors in the drive basically perform a similar function, each time the drive is switched on from status 008 to 009 the capacitors are "pre"-charged via the resistors, after which the rectifier takes over and full DC power is then available(You may briefly see the status 010, this is when the pre-charging is active). You cannot run the drive until the pre-charge cycle is complete (See the status word) Regards, Graeme
AttachmentForming.pdf (2757 Downloads) |
This contribution was helpful to1 thankful Users |
2/12/2010 2:58 PM | |
Posts: 16 Rating: (0) |
hi please clear if precharging does the same function of reforming before every start of the inverter then why we do reforming separately regards |
2/21/2010 2:58 PM | |
Posts: 16 Rating: (0) |
awaiting your prompt response please |
6/10/2015 1:13 PM | |
Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4767 Rating: (123) |
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3/18/2017 4:25 PM | |
Posts: 1 Rating: (0) |
what is precharging. and why prechargigng require ?????? |
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