Voltage Arc Trip Level - Advanced Energy Pinnacle User Manual

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Advanced Energy

Voltage Arc Trip Level

By setting the voltage arc (V-arc) trip level you are indicating the voltage threshold at
which the Pinnacle recognizes an arc. The best value for a voltage arc trip level is
somewhere between your process's normal operating voltage and the typical low
voltage that occurs when your system experiences a hard arc. The latter depends on
your target type, but typical low voltages for hard arcs are between 10 and 25 V. Thus
a reasonable voltage arc trip level might be 50 V. Note, however, that some target
types experience hard arcs at 100 V, so do not assume that 50 V is right for all
processes. To set the V-arc trip level, use the ARC menu on the Pinnacle Remote
Panel or AE Bus/PROFIBUS Command 10 (see Chapter 4).
TCC Algorithm Enable
When the Target Condition Cycle (TCC) algorithm is enabled and the unit receives an
on command, the Pinnacle microprocessor sets the arc detect time to 20 µs and
initiates a series of trials (or "steps") to reach your desired setpoint ("the final
setpoint"). To begin, the microprocessor sets an initial setpoint equal to 50% of the
final setpoint. After 10 ms, the microprocessor checks the output level and sets a new
interim setpoint equal to 125% of the output level. The microprocessor continues to
check the output level and to set a new interim setpoint (always 125% of the averaged
output level) every 10 ms until the output level is equal to 80% of the final setpoint.
When 80% of the final setpoint is reached, the interim setpoint is set equal to the final
setpoint, and the TCC algorithm ends. You can enable TCC mode through the
PROCESS_CONTROL menu on the Pinnacle Remote Panel or through AE Bus/
PROFIBUS Command 79 (see Chapter 4 for more information).
Note: You cannot enable the TCC algorithm if you have already set up ramping
recipes.
Target Type: Metal
Use the metal setting only for metal targets. Indicating a metal target pre-selects an arc
detect delay time of 0 µs during a normal process cycle and 20 µs during the TCC. It
sets an arc shutdown time of 30 µs (480 µs when slow arc response is selected)during
both a normal cycle and the TCC. You can select target type through the ARC menu
on the Pinnacle Remote Active Panel or through AE Bus/PROFIBUS Command 30
(see Chapter 4 for more information).
Note: 10 kW and 20 kW Pinnacle units with a 208 V input configuration have a
minimum arc shutdown time of 50 µs
6-4 Operation 5702156-E