Lenze 520 Series - Page 62

60 4Q - DC Chopper 520 series
Set speed reference to maximum.
Turn trimmer nmax clockwise, until the desired speed is reached.
- Turn trimmer ~ clockwise, until the drive becomes instable (speed oscillations).
Then turn trimmer ~ counterclockwise, until the drive is stable again.
- Set speed reference to 0V.
- Compensate a possible offset speed via trimmer n
0ff.
(1
Caution! If the drive accelerates uncontrolled. immediately operi switch RFR.
Possible causes could be:
a) Tacho Une disconnected
b) Short-circuit of tacho signal
c) No reverse polarity between referen~e 8nd actual value
If the speed is stable after checkingthe actual value signal and new
~ enable( the maximum speed can be Set.
Lenze