Lenze EVF9383 - Manual (Page 177)

Application examples
Dosing drive for a filling station
3−7
l
EDSVF9383V−EXT EN 2.0
Calculating the actual value
l Use the FB INT1 to add the motor speed to an angle of rotation. The dosing amount can be
calculated via the angle of rotation.
– An angle of rotation of 360 ° (one revolution) corresponds to 65536 inc.
l Via C1351, the angle of rotation is converted into an analog signal and adapted to the
setpoint.
Example
With a setpoint of INT1−AOUT = 100 %, the conveyor worm shall make 50 revolutions. The geared
motor has a ratio of I = 20.
l The motor must make 1000 revolutions.
– The angle of rotation is 65536 inc × 1000.
l Select 65536000 under C1351.
l The following formula is used for the calculation:
INT1−AOUT
+
Drehwinkel [inc]
C1351
@ 100 %
See also: (
¶ 2−110)
Completing dosing
The FB CMP2 sends the brake signal for the linear ramp function generator in the FB NSET. The ramp
function generator is controlled via NSET−RFG−0 and thus led to the zero speed setpoint.
Deceleration is activated if the actual amount plus the remaining amount (this amount is added during
deceleration) corresponds to the setpoint.
Considering the remaining amount
l Use the FB ARIT1 to square the current speed (C0338 = 3).
l Use the FB CONV1 to adapt the output signal of ARIT1 under consideration of the
deceleration time T
if
to the setpoint and actual value. The following formula is used to
calculate the C0940/C0941 ratio:
C0940
C0941 +
n
max
60
@
T
if
2
@ 65536
C1351
n
max
Value in C0011
T
if
Deceleration time (value in C0013)
Example
l n
max
= 3000 rpm
l T
if
= 1 s
l C1351 = 65536000 (corresponds to 1000 motor revolutions)
The C0940/C0941 ratio must be 0.025 (e.g. C0940 = 25; C0941 = 1000).