| Application
of Sanken inverter in communication cable drawbench |
Drawbench is a kind of important equipment in
processing of metal wire stock, and its production quality and efficiency
are critical to the enterprise. In general, drawbench can be classified
under 3 types: pulley type, looping type and liner type. Along with
the development of production technologies, in electrical control,
the AC inverter technology and PLC program control have replaced the
DC transmission and torque motor gradually and have established the
leading position.
Let's take the drawbench reconstruction in a communication cable company
limited in Anhui for example to introduce the advantages and usage
methods of Sanken VM05 series inverters for coiling control. |
<Outline of the equipment>
Wire stock: copper wires used in communication cable
Wire diameter: before wire extension:  5mm
approx.; after wire extension: 1mm
approx.
Wire speed: 703m/min @ 50Hz operation
Coiling reel: ID: 280mm;
OD: 390mm
Tension bracket: counterbalance type tension bracket sliding up and
down; Output signal range of sector coaxial potential device: 0~10V
Tension reference: 2kg approx.
Inverter: extension side:SHF-18.5K-A; coiling side: SHF-4K-B
Braking resistance: None; The two inverters are connected through
DC bus.
Drawbench: Made in Shanghai in 1960s, DC motor-driven originally
|
 |
 |
<Functional characteristics>
The unique tension bracket high-speed compensation function of Sanken
VM05 series inverters is fully exhibited in this example.
The high-speed tension bracket compensation is a function to compensate
instantly the large transient variation of the tension bracket at
the time of starting and stopping or due to any external reasons.
This function is to perform PI control to the deviation part of the
non-operation region of the tension bracket to make it return to the
non-operation region. Compared with low-speed tension bracket compensation,
very quick actions are used for compensation to perform gain setting.
Moreover, when it is above the Up*Low level of the tension bracket,
the compensation quantity can be kept constant.
The tension bracket high-speed compensation function has improved
the characteristics of the coiling control greatly in order to meet
the requirements of the users for high-speed and constant-tension
control.
|
|
|
<Adjustment sequence>
1) Wiring of the inverters and of the control cabinet
2) Operate the 2 inverters individually. Measure the line speeds (m/min)
of the pulling wheel and coiling wheel with a tachometer, and then
perform combined operation.
Gain adjustment of the coiling-side inverter
3) Confirm the reference value of the tension bracket. Confirm and
input the voltage values of the various action regions.
4) Thread the copper wires. After confirming the basic actions under
low frequency, confirm the high-speed actions gradually.
5) 7) After the coil is full, change a new reel and then restart to
confirm the load current.
6) Stop midway and restart for confirmation.
Pay attention to resetting of the MCL switch at the coiling side.
|
 |
|
|
