HZ, STL, and Duty Explained




 The “CYCLE TIME” is one full down/up cycle of the A-Bar; The quantity of full cycles that take place in one second makeup the machines speed in Hz (cycles per second).

We start at point “A” were the front spring first touches the contact screw and begins to flow current (Amps). As you can see for the duration of “B”, the front spring bounces on the contact screw causing the current to oscillate. This is what we call “Settle” or “STL” as it shows on the CX2 display. Settle is represented as a percentage of “ON TIME” so if you are seeing an “STL” of 20%, it’s saying that the front spring is bouncing for 20% of the machines “ON TIME” before it settles in. Generally, the longer the front spring’s free length, the higher the settle will be.  Although a high settle reading suggests a less efficient contact interface, a better indicator of a poorly tuned machine would be an erratic reading.

In the CX-G2 power supplies, duty cycle is simply “ON TIME” as a percentage of “CYCLE TIME”.  Rotary machines do NOT turn on and off so they are always running at 100% duty cycle. The G2 power suplies have a very fast processor and very precise current sensing hardware so our measurements and math are extremely accurate. You may notice that the duty readings are higher than you have observed with other power supplies.