The unique coiling function of Sanken VM05 series inverters has been recognized by more and more users. In fact, the coiling function of VM05 can be used not only in the coiling side but also in the uncoiling side. The following is a representative application of Sanken inverter in cable-former.

The tension bracket feedback signals participate in the adjustment and control of both coiling and uncoiling.
The main inverter (INV1) gives the main speed signals (pilot signals) to control the uncoiling and coiling inverters respectively.

Adjustment procedure:
Adjustment procedure:
Due to the quick compensation effect of the tension bracket, no additional setting of the coiling curve is performed.
Under the non-threading status, INV1 & INV2 and INV1 & INV3 run individually. Measure the linear speeds of the various coiling reels with a tachometer, and adjust the offset and gain (Cd62 & Cd63) to make them generally synchronous.
INV2 and INV3 run individually to make the tension bracket move up and down. Check if the frequency at the non-operation region changes. On the basis of this, check the correct change tendency of the frequency outside the non-operation region. Observe the movement of the tension bracket and the frequency changes to decide an approximate gain value (Cd655~Cd658).
After threading, run at a low speed. Pay attention to the movement of the tension bracket and adjust the relevant gain values properly.
Accelerate to normal speed to confirm the reliability.
During the stable movement, stop the inverter suddenly to check if the movement stops synchronously.
After it stops, accelerate again to check the stable action.
On completion of the coiling, change a new coiling reel and redo the coiling to check if it works normally.
Change the frequency of INV1 to check the movement from low speed to high speed.
After changing the diameter of the coiling reel and the thread size, check for normal movement.
On completion of the coiling, reset MCL while stopping.