CandCNC THC Sensor PWM - Page 5

CandCNC
Page 5
E
Digital Plasma
Module
Torch
Volts IN
ON
ACT
+5
To DCP-01
To DTHC
Module
Test
Active
ARC OK
To Plasma
Cable
Input JACK
Divided Volts
CandCNC
Front
Arc OK
+12 PWR
To CPC or RAV-02
THC SENSOR PWM II MODULE TEST/CAL
THC PWM II Module Rev 1.4 (Plasma Pickup Module) can be put in TEST/CAL
mode without removing the card from the case.
 Turn the case over and look on the back. There are two recessed test buttons
find the button marked VOLTS.
 Unplug the Divided Volts (from the plasma) either the 2 pin plug or the stereo
plug. Leaving the Divided Volts plugged in will Skew the reading.
 Push and hold Volts Test puts the unit in test/cal mode. The blue Volts IN ACT
LED on the front will flash. You should see 126 to 128 volts displayed on the
TORCH VOLTS in the CommandCNC screen
 Releasing the button will take the unit out of test/cal mode and the LED will stop
flashing and the TORCH VOLTS reading will return to Zero.
 In TEST mode the PWM is completely tested. If you unit passes the Volts Test
but the voltage is still wrong or zero when the torch fires then the cable to
plasma is bad or the voltage divider in the plasma is bad.
The test is based on a simulated PWM from the circuit so if the prescale divider
setting is wrong the calibration will show correct but when the torch is fired
the voltage will be wrong.
THC SENSOR PWM MODULE VOLTS
TEST/CAL
Arc OK
(Transfer)
TORCH
SWITCH
SENSORSENSOR
PWM PWM
IIII
ARC
OK
VOLTS
TEST
Press and HOLD
Volts Test. Front panel
blue LED Volts ACTive
will flash
Press and
Hold for
ARC OK
TEST
Check jumper settings
to match plasma divider ratio
THC Sensor PWM REV21
For use with
DTHC IV
DTHC V
50:1
20:1
7:1
Hypertherm
TD & Others
TD/Victor 30:1
RAV-01/02
(Factory Default)