Hi,
im running in trouble to setting up my Delta C2000 VFD with a Fanuc AC Spindle Motor Model 3. I want to do fully cloesd loop with a ABZ Encoder on the Spindle Shaft.
I´ve already read many many threads about setting up AC Spindle induction Motors with a VFD. The most using sensorless vector control with a V/F table.
The problem is: Delta C2000 only offers two modes to running closed loop induction motor. 1. freq/volt Control with feedback 2. FOCPG field orientated vector control with feedback.
My Motorspecifications on the motor plate:
Fanuc AC Spindel Motor Model 3
cont./30min. 3.7 / 5.5 KW
cont./30min. 17 / 22 Amp
Volt: 200v
Poles: 4
RPM 1500/6000
The only way i can ordinary setup my motor ist in FOCPG (fieldorientated vector control with encoder) at following settings.
Base Frequency: 200Hz (4 Poles = 6000rpm)
Max Voltage: 200V
Poles: 4
rating power: 3.7kw
17A
The Problem is, that the relation between voltage and rpm is linear. so, low rpm low voltage = low torque, but i want to do tapping. So it is useless for me.
If i using sensorless vector control or frequency/voltage mode i cant ordinary setup the vfd. The motor is always over saturated with the voltage, make noise and doesnt move.
But, Doing my math, my voltage at 50Hz 1500 rpm is : 3700RPM/17A/1.73 = 125V. With this parameters, the motor doesnt turn and is making noise.
Have anyone a plan how to fix the low torque problem in FOCPG (fieldoriented vector control with encoder) on the Delta C2000 ?
or is there a way to use a another control mode ?
Regards