![background image](http://html1.mh-extra.com/html/safco/cs-i-150a/cs-i-150a_operation-and-maintenance_3253595073.webp)
CS-I User and Maintenance, R.2.8 ENG
Safco Systems Ltd-Via Isonzo 17/b-20090 Cesano Boscone-Milan-Italy
tel. +39 024504433 Fax +39 024504321 E-mail:[email protected] Web site: www.safcosys.it
73 of 109
7.
Control mode and features
Using the parameters of the program you can choose six modes of regulation.
7.1.
Duty rate D‰
In D‰ mode the drive of transformer primary is made in proportion Duty set in the
parameters for the hot cycles, and is fixed.
With this setting is not required the connection of the Rogowski coil or of the CT. With no
use the system parameter “current transducer”, must be set to "NO"
This mode allows the use of the unit without any calibration.
If you connect the ring Rogowski or CT, you can read on the display the RMS value of the
main welding current and of the pre-and post-welding current.
In any case, no current regulation is done, so the current will vary with changes of the
physical parameters of the machine.
7.2.
Duty rate compensated primary voltage V‰
In V‰ mode the drive of the transformer primary is made in duty-percentage as set in the
program parameters for the hot cycles, and varies to maintain a constant voltage on the
primary of the transformer in case of lowering or raising the main supply voltage.
With this setting is not required the connection of the Rogowski coil or of the CT. With no
use the system parameter “current transducer”, must be set to "NO"
This mode allows the use of the unit without any calibration. This mode allows use of the
unit without any calibration.
If you connect the Rogowski coil or CT, you read on the display the RMS value of the main
welding current and of the pre-and post-welding current.
In any case, the current adjustment is not done, so the current will vary with changes of the
physical parameters of the machine.
7.3.
Constant current IK
In IK mode, the drive of the transformer primary is made by adjusting the duty so that the
circulating current in the secondary circuit, detected by Rogowski coil, secondary control, or
CT, primary control, is constant and it matches the set in KA in the program parameters for
the hot cycles, the adjustment is made every ms to override changes due to fluctuations in
line voltage, changes of resistance of the piece etc…
This mode does not work without the calibration of the machine (transformer - plant) for
each pair of electrodes-transformer used.
The Rogowski coil is always necessary to get the reaction voltage from the secondary or
CT to get it from primary.