Heat Seal Power Transformers

T◆O◆S◆S® Heat Seal Power Transformers

T◆O◆S◆S® Heat Seal Power Transformers are designed and built to mate with PIREG® Impulse Heat Seal Temperature Controllers. It is important to use a properly designed transformer because the performance of the sealing system depends upon the correct selection and use of each component in the system. The Secondary Voltage selected will affect the rate of heat seal band temperature rise from the moment of impulse until reaching the selected set point temperature. This rate of rise should not exceed 1oC/mSec.

For More Information see 9 Steps to Heat Sealing Perfection: Step 8 - Transformer Selection

Button
Button

Voltage Selection

T◆O◆S◆S® Power Transformers are supplied with terminal blocks or 24-inch lead wires to facilitate installation. Each terminal or lead is identified as follows:

Input Side

Hl,H2,H3,H4 are the Primary connections

Output Side

X - Secondary voltage Common

1 - Lowest Secondary voltage tap

2 - Medium Secondary voltage tap

3 - Highest Secondary voltage tap

Additional Voltage Selections

Additional voltage selections may be obtained by connecting at any two of the Secondary connections (#1,2, or 3).

EXAMPLE: If the transformer is specified as 220/12,30,36 you will get 12V, 30V, or 36V by connecting across "X" and “1”, “2”, or “3” respectively. However, you can also get 24V by connecting at “1” and “3” (36-12= 24). Similarly, the transformer specified above can be used for 12V, 18V, 24V, 30V, or 36V. CAUTION: It is not recommended to configure a secondary voltage that is lower than the lowest voltage tap on the transformer. (On a 12,16,20 transformer, do not try to achieve 8 Volts by going between 20 & 12)

NOTE: Only two of the Secondary leads can be used at any one time. The others must be capped off.

Start-Up

Inspect the wiring to be sure that all connections to the transformer, the heatseal jaw and the controller are all very tight. Loose connections will cause erratic results.

Connect the transformer using one of the lower tap selections and try the system. The response of the controller may be slow. If so, set-up the voltage until the response is fast enough to produce the desired result. CAUTION: Take care not to exceed the 1˚C /mSec limit.

Grounding the Transformer

To properly ground the transformer the following instructions can be used: Remove one of the bottom screws connecting the mounting brackets and the laminations. Remove and discard (2) nylon shoulder washers. Obtain a Grounding Wire (Green #12AWG stranded wire with #10 Ring terminal crimped on both ends). Place a #10 washer on the screw, place the ring terminal on the screw, and then replace the bracket using screw and nut to hold the assembly tight together.

When the transformer is installed the grounding wire must be firmly attached to the machine frame or other electrical ground.

Choosing the Correct Transformer

We recommend that you always contact our Applications Engineers to determine the correct size for your transformer. Factors that are taken into consideration are the size of your heat seal band, number and types of bands being heated, cycle timing, desired heat-up times, & incoming house voltage.