pro-wave 300gtsw
6-10
June 21, 2012
6.11 Main PCB1 Gate Drive Enable
Signal Test
The gate drive signals are 21.3kHz square wave signals,
with an OFF level of -4VDC for 26µs, and the ON level of
+11VDC for 21µs. There is a 2.5µs dead time before and
after the ON time of each channel before the other goes
through its OFF/ON transition. Refer to figure 6-7.
1. Apply power to the unit and turn the MAIN
CIRCUIT BREAKER (MCB) ON.
2. Using an oscilloscope at the CN8 connector on the
Main Circuit Board (PCB1), measure the voltage
between Q1 signal pairs:
Pin 1 and 2
Pin 4 and 5
3. Using an oscilloscope at the CN9 connector on the
Main Circuit Board (PCB1), measure the voltage
between Q2 signal pairs:
Pin 1 and 2
Pin 4 and 5
4. Using a voltmeter, measure the voltage between
signal pins 1 and 2 and pins 4 and 5 at connector
CN8. The voltage between each pair of pins should
be +5VDC. Switch the PROCESS SELECTOR
switch to the TIG LIFT START position. The voltage
between both pair of pins should drop to -4VDC.
5. Return the PROCESS SELECTOR switch to the
STICK position.
6. Using a voltmeter, measure the voltage between
signal pins 1 and 2 and pins 4 and 5 at connector
CN9. The voltage between each pair of pins should
be +5VDC. Switch the PROCESS SELECTOR
switch to the TIG LIFT START position. The voltage
between both pair of pins should drop to -4VDC.
If the results of any of these tests are incorrect, replace
the Main Circuit Board (PCB1).
Содержание 300GTSW Pro-Wave
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