hello everybody
what could be the reasons for drive tripping with armature overvoltage whil running .
regards
ram
Armature Overvoltage
Started by ram14375, Oct 09 2008 05:19 PM
5 replies to this topic
#2
marke
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Posted 09 October 2008 - 05:49 PM
Hello Ram
Over voltage is generally due to an "overhauling" load. i.e. the load is driving the motor rather than the motor driving the load.
This must be a single quadrant drive?? A four quadrant drive would dump the excess back into the supply.
Best regards,
Mark.
Over voltage is generally due to an "overhauling" load. i.e. the load is driving the motor rather than the motor driving the load.
This must be a single quadrant drive?? A four quadrant drive would dump the excess back into the supply.
Best regards,
Mark.
Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
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#3
ram14375
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Posted 12 October 2008 - 04:25 AM
dear Marke
Thanks for your inputs
Yes this is a single quadrant dc drive used as sepol drive in our cement mill application
how this can be avoided
the drive is of abb make dcs 501
regards
ram
Thanks for your inputs
Yes this is a single quadrant dc drive used as sepol drive in our cement mill application
how this can be avoided
the drive is of abb make dcs 501
regards
ram
#4
marke
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Posted 17 October 2008 - 06:45 AM
Hi ram
Using a four quadrant drive will overcome this.
Some drives allow you to add "braking" resistors that will absorb the extra energy.
Best regards,
Mark.
Using a four quadrant drive will overcome this.
Some drives allow you to add "braking" resistors that will absorb the extra energy.
Best regards,
Mark.
Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters
#5
AB2005
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Posted 18 October 2008 - 10:06 AM
Or you can make some changing in your wiring as when the load drives the armature, it may isolate from drive. It depends upon your application and number of starts and stops/hour.
"Don't assume any thing, always check/ask and clear yourself".
#6
gerryroxas
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Posted 23 October 2008 - 05:58 AM
Hi,
You may check the voltage feedback circuit, it may not sending the proportional feedback to the drive.Feedback circuit maybe derived from encoder, tacho generator or Armature voltage divider circuit, you may try to check also the voltage feedback "IR compensation circuit" (if fitted).
Most of our experience with over voltage fault is due to lost of voltage/speed feedback, voltage unstability maybe due to mechanical reason as well, i.e loose shaft coupling keys to encoder or tachogenerator.
Regards,
Gerry
You may check the voltage feedback circuit, it may not sending the proportional feedback to the drive.Feedback circuit maybe derived from encoder, tacho generator or Armature voltage divider circuit, you may try to check also the voltage feedback "IR compensation circuit" (if fitted).
Most of our experience with over voltage fault is due to lost of voltage/speed feedback, voltage unstability maybe due to mechanical reason as well, i.e loose shaft coupling keys to encoder or tachogenerator.
Regards,
Gerry
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