The Plc Kid
Member
I am having issues with a 1336 Force AC Drive that the bus voltage is going too low when increasing speed.
Currently i can only run at about 50-60% motor rated rpm and if we go higher the bus voltage drops down to around 400 and we lose the drive enable.
This is a common dc bus application and i do not see the bus voltage drop with my meter connected but i do see it drop on the drive HIM.
The dc bus inductor http://literature.rockwellautomation.com/idc/groups/literature/documents/tg/1336t-tg002_-en-p.pdf pdf page 107 seems to be getting really hot also. What is the dc bus inductor? It really looks like an internal brake resistor the way it is connected?
This system is common dc bus with 1 common rectifier and about 12 drives the drive in question is 100 HP and the system has a ab dc bus chopper module connected to a larger braking resistor outside the cabinet to shed excess bus voltage. If this dc bus inductor is acting like a brake module then it should not even be there?
Drive part # is 1336T-R100-AN-GT2EN Series D
Any Ideas?
Currently i can only run at about 50-60% motor rated rpm and if we go higher the bus voltage drops down to around 400 and we lose the drive enable.
This is a common dc bus application and i do not see the bus voltage drop with my meter connected but i do see it drop on the drive HIM.
The dc bus inductor http://literature.rockwellautomation.com/idc/groups/literature/documents/tg/1336t-tg002_-en-p.pdf pdf page 107 seems to be getting really hot also. What is the dc bus inductor? It really looks like an internal brake resistor the way it is connected?
This system is common dc bus with 1 common rectifier and about 12 drives the drive in question is 100 HP and the system has a ab dc bus chopper module connected to a larger braking resistor outside the cabinet to shed excess bus voltage. If this dc bus inductor is acting like a brake module then it should not even be there?
Drive part # is 1336T-R100-AN-GT2EN Series D
Any Ideas?