Tweco 300 XT Ultra-Cut Plasma Cutting System - Manual (Page 155)

ULTRA-CUT 300 XT
Manual 0�5�7� PPENDIX ��9
Arc starter without Spark Gap (Ultra-Cut)
1. Check for power to the RS 1000XT’s Ignition Module during the 15 seconds following preflow (ignition
phase). rc starter power comes through the rear panel circuit breaker CB�, make sure it isn’t tripped.
a. During the ignition phase, measure for 1�0 VC at the input terminals marked 1�0 VC on the Ignition
module, a gray rectangular box with screw terminals on one side.
WARNING!
Do not let the meter probes (or your hands) come in contact with the other terminals marked Hb and Ho or the
other end of the wires connected to them. These can have 10,000 volt pulses which can cause physical harm and
will damage your meter.
�. If 1�0 VC is not present go to step 3.
a. If 1�0 VC is present and still no spark, the Ignition Module may be bad.
3. 1�0 VC to the remote rc Starter comes from J59�7 & 9 on the power supply rear panel and connects to
J58�7 & 9 on the RS1000XT. Remove the cable from J59 and during the ignition phase measure for 1�0 VC
between pins 7 & 9.
a. If 1�0 VC is present problem is in the cable to the RS 1000 XT or the J58 connector and internal harness
in the rc Starter.
b. If 1�0 VC is present proceed to the next step.
�. 1�0 VC to J59 comes from the relay board J8�3 with return on pin 11. On the Relay board, RF ON LED,
D�3, should be on during the igniting phase. If it is not skip to the next step.
a. If D�3 is on and there is not 1�0 VC at J8�3 & 11 then the Relay board is bad.
Either Arc Starter
5. /RS ON signal not on. CCM sends active low signal “ /RS ON” over the �0 pin ribbon cable on pin
16 to the Relay & Interface board. On the relay board RS Control relay (K�) closes (RF ON LED, D�3 on)
sending 1�0 VC to J8�3 with return on J8�11. From here it either goes to the HF transformer T� (C�00XT)
or to J59 as described above.
a. Measure the signal “/RS ON” on pin 16 of the �0 pin ribbon cable relative to TP1 on either the CCM
I/O board or the Relay board. If it is low (less than 1V) skip to step 6. Otherwise continue this step.
NOTE
If the CCM thinks there is already a pilot it would not enable the HF. Pilot board has a current sensor that sends
a differential analog pilot current level signal to the Relay board which in turn passes that signal to the CCM. On
the Relay board D11 LED “Pilot Current Detected” or just “PILOT” lights if it sees a signal from the pilot board.