DRV-28 inverter
s Basic operartion instructions
-116-
layer.
b) Determine Z pulse direction
Set P00.10=20Hz, and set P00.13 (running direction) to forward and reverse direction respectively to
observe whether the difference value of P18.02 is less than 5, if the difference value remains to be
larger than 5 after setting Z pulse reversal function of P20.02, power off and exchange phase A and
phase B of the encoder, and then observe the difference between the value of P18.02 during forward
and reverse rotation. Z pulse direction only affects the forward/reverse positioning precision of the
spindle positioning carried out with Z pulse.
Step 5:
Closed-loop vector pilot-run
Set P00.00=3, and carry out closed-loop vector control, adjust P00.10 and speed loop and current
loop PI parameter in P03 group to make it run stably in the whole range.
Step 6:
Flux-weakening control
Set flux-weakening regulator gain P03.26=0–8000, and observe the flux-weakening control effect.
P03.22–P03.24 can be adjusted as needed.
2. Commissioning procedures for closed-loop vector control of synchronous motor
Step 1:
Set P00.18=1, restore to default value
Step 2:
Set P00.00=3 (VC) , set P00.03, P00.04, and motor nameplate parameters in P02 group.
Step 3:
Set P20.00 and P20.01 encoder parameters
When the encoder is resolver-type encoder, set the encoder pulse count value to (resolver
pole pair number × 1024), eg, if pole pair number is 4, set P20.01 to 4096.
Step 4:
Ensure the encoder is installed and set correctly
When motor stops, observe whether P18.21 (resolver angle) fluctuates, if it fluctuates
sharply, check the wiring and grounding. Rotates the motor slowly, observe whether P18.21
changes accordingly. If yes, it indicates motor is connected correctly; if the value of P18.02
keeps constant at a non-zero value after rotating for multiple circles, it indicates encoder Z
signal is correct.
Step 5:
Autotuning of initial position of magnetic pole
Set P20.11=2 or 3 (3: rotary autotuning; 2: static autotuning), press RUN key to run the
inverter.
a) Rotary autotuning (P20.11 = 3)
Detect the position of current magnetic pole when autotuning starts, and then accelerates to 10Hz,
autotuning corresponding magnetic pole position of encoder Z pulse, and decelerate to stop.
During running, if ENC1O or ENC1D fault occurred, set P20.02=1 and carry out autotuning again.
After autotuning is done, the angle obtained from autotuning will be saved in P20.09 and P20.10
automatically.
