Application of
Sanken VM05 Inverter in doubler twister
Doubler
twister is a kind of commonly used equipment in metal product industry.
It is suitable for stranding drawn steel wires into ropes. The coiling
part requires control to the tension. With the V. F separation function
of Sanken VM05/SHF series inverters, the output frequency and voltage
can be set separately, suitable for control of discretional torques.
So it is very suitable for applications in similar equipment.
I. Conditions of
the equipment
Type
of product
TD2-402FP
doubler twister
Motor torque (N.M)
2.3
Motor speed (m/s)
0~1200
Coiling tension (N)
17
Coiling time (s)
80
Coiling speed (m/s)
155
Coiling inverter
SHF-2.2K-A
II. Control mode:
The
tension control part is composed of the Sanken SHF series inverter
and the torque motor. The PLC provides the inverter with the operation
signals and analog voltage signals (0-10V). When the equipment is
started, it needs larger tension. PLC provides with variable analog
voltage signals. It is larger (approx. 8V) at the beginning of start,
and then decreases to 7V approximately during the operation and
keeps stable.
The frequency of the inverter is set from
the panel. The input voltage commands (0-10VDC inputted from VRF1)
and operation commands are given by the external PLC. The input voltage
commands are given by the PLC according to the calculated values on
the basis of the tension needed by the equipment (as shown in the
above right figure), and can be adjusted slightly through the setting
unit on the operation panel.
III. Commissioning parameters of
the inverter:
Functional
code
Settings
Functional
code
Settings
Cd001
2
Cd050
2
Cd002
3
Cd053
4
4 1.5
Cd019
2
Cd066
2
Cd023
2
Cd071
11
Cd029
47
Status
parameters during the operation:
Output voltage: 310V
Output current: 0.9A
Output frequency: 47HZ
VRF1: 7VDC
IV.
Summary
According to the measurement to the coiling tension by the I-shaped
wheel during the coiling process, the tension variation range is
within the tolerance. The tension value measured at the end of the
coiling is 17.8N approximately. Compared with the torque controller,
the tension deviation range is smaller, fully conforming to the
process requirements.
