Mitsubishi Electric A800 Plus Series Function Manual page 201

Application examples
Printing
Line speed
setting
Encoder
∗1 To keep the line speed constant, the winding speed decreases with increasing the roll diameter. The FR-A800-R2R inverter automatically
calculates the winding speed by calculating roll diameter.
∗2
Dancer feedback speed control (PID control) is performed to compensate the frequency so that measurements shown on the displacement
gauge (non-contact potentiometer) remains the same.
 Example setting of parameters
The following shows mechanical specifications and parameter settings required for configuring the system shown as the
application example. The parameter settings are examples for a 15 kW motor and the 18.5 kW inverter used for the winding
roller.
Item
Minimum roll diameter 100 mm
Maximum roll diameter 1000 mm
Gear ratio 1/3
Maximum speed of the
200 m/min
actual line
Dancer signal 0 to 10 V input
Analog signal, 0 to 10 V input (60
Line speed command seconds cushion time enabled at
acceleration/deceleration)
Initial roll diameter
Enabled
calculation
Dancer/tension control selection (X114)
Pr. Parameter name
1 Maximum frequency
200
APPENDIX
unit
Encoder
SF-
V5RU
FR-A800-R2R
FR-A8AP
2
Actual line speed
monitoring
AM
For intermediate roller
(reference axis)
Specification
Initial
value
120 Hz
Displacement
gauge
Air
cylinder (Non-contact
potentiometer)
∗2
Electro-pneumatic
converter
Dancer/tension control selection X114
Line speed (0 to 10 V)
Item
Accumulated amount
Roll diameter storage
Tension setting output
Taper control
Roll diameter at taper
start
Taper ratio
Taper ratio setting
FR-A800-R2R
2 (0 to 10 V)
1 (0 to 10 V)
4 (0 to 10 V)
Dancer tension command
AM
RL
Winding diameter calculation completion
RM
at star signal (Y232)
CS
RUN
Setting
value
Set about 110% of the maximum speed (the maximum speed
refers to the motor speed for the minimum-diameter roll at the
maximum line speed) (the amount of dancer compensation:
70 Hz
about 10%).
ω = Maximum line speed / (π × Minimum diameter × Gear ratio)
= 200 × 10 / (π × 100 × 1/3) / 30 ≒ 63.66 Hz × 1.1 ≒ 70 Hz
3
Actual line speed Actual line speed Actual line speed
(single phase) (single phase) (single phase) ∗1
Encoder
SF-
V5RU
FR-A800-R2R
JOG
FR-A8AP
1
RL
FM
4
Taper ratio
AM
2
For winding roller
Specification
300 mm
Enabled
Required
Enabled
800 mm
40%
Analog signal, 0 to 10 V input
Remarks
Actual line
speed
monitoring
Dancer
tension
command