Arc Recovery Test - Advanced Energy Pinnacle User Manual

®
Advanced Energy
Table 6-3. Custom Arc Shutdown Times (Standard and Persistent Arc Handling Modes)
Index Standard
Fast Arc
Shutdown
3
4
5
6
7
8
9
Note: 10 kW and 20 kW Pinnacle units with a 208 V input configuration have a
minimum arc shutdown time of 50 µs.

Arc Recovery Test

After the arc shutdown time has expired, the Pinnacle supply reapplies output power
to the load and examines the output voltage level. The output voltage must rise above
your selected V-arc trip level within an internally fixed time of 20 µs (320 µs when
slow arc response is selected). If the output voltage rises above the V-arc trip level
before the 20 µs (320 µs when slow arc response is selected) period has ended, the
Pinnacle power supply will resume normal output. If the output voltage does not rise
above the V-arc trip level by the end of the 20 µs (320 µs when slow arc response is
selected) time limit, then the Pinnacle unit initiates another arc shutdown. Metal flakes
and unusually dirty target conditions may be responsible for multiple arc shutdowns.
Connecting large capacitors (>.047uF) on the Pinnacle output can hinder the Pinnacle
from achieving proper output voltage within 20 µs.
Arc Recovery Time
Recovery to the pre-arc output level usually occurs in less than 25 µs from the end of
your selected arc shutdown time. This recovery time is typical when you have selected
a metal target or an arc shutdown time between 10 µs and 2500 µs (160 to 40000 µs
when you have selected slow arc response). However, it may be too rapid for some
processes. Some target materials respond better to a slow (or "soft") recovery period.
A "soft" recovery allows for greater plasma stability at the time of recovery or
prevents any possibility of overshooting the operating point. If you select an arc
shutdown time of 500 µs or greater, the unit automatically selects a 1 ms "soft"
recovery time period.
6-8
Standard
Mode Mode
Slow Arc
Shutdown
Times Times
40 µs 640 µs
50 µs 800 µs
100 µs 1600 µs
200 µs 3200 µs
500 µs 8000 µs
1000 µs 16000 µs
2500 µs 40000 µs
Operation
Persistent Persistent
Mode Fast Mode Slow
Arc Arc
Shutdown Shutdown
Times Times
40 µs 640 µs
50 µs 800 µs
100 µs 1600 µs
200 µs 3200 µs
500 µs 8000 µs
1000 µs 16000 µs
2500 µs 40000 µs
5702156-E