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Thermal Comfort 3000 manual Volt Bias Test, Corner Slowdown CSD

Models: 3000

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The display signal at J7-2 should be equal to the control pot wiper voltage at J7-18 measured in Step 3 above.

If this is not correct, the Switching Control PC Board is defective.

After arc transfer the display signal switches to represent actual cutting current as monitored by the Shunt Amp and Switching Control PC Boards. At the same time OK-To-Move is sent to the re- mote shutting off the left hand decimal, refer to Section 4.05-Q, OK-To-Move Tests. The output of the Shunt Amp at J9-5 of the Switching Control PC Board is 5.45 volts for 150 Amps. The display signal at J7-2 should be 10 volts. If the shunt volt- age is correct and the display signal is not then the Switching PC Board is defective.

If the remote display and the shunt amp voltage at J9-5 is correct but the cutting current is low (mea- sured with separate ampmeter) then the Shunt Amp may be faulty but first check step 1 of this section.

5. Corner Slowdown (CSD)

Corner Slowdown (CSD), a CNC signal, is also referred to as standoff inhibit or corner current reduction. The CNC signal comes from the cut- ting machine controller to inhibit the standoff con- trol when cutting speed reduction is desired. Spped reduction may be needed for cutting around corners where high speeds would ad- versely affect the standoff regulation. It also can be used to reduce cutting current when the cut speed is lowered.

A contact closure between J29-7 and 8 or J6-7 and 8 of the Remote Control (RC 6010) sends an active low signal to the Standoff Control (SC10) via J5- 21 which turns OFF the Standoff Control THC ACTIVE indicator, turns ON the three decimals in the VOLTS display and prevents the Standoff Control (SC10) from changing torch height.

NOTE

Refer to Appendix XI for Corner Slowdown (CSD) Circuit Diagram.

At the same time, the CSD relay in the Remote Control (RC6010) closes switching current control from the OUTPUT AMPS control to the CSD con- trol and turning on the three decimals in the AMPS display. Turning ON switch SW1-1, a dip switch on the Remote Control PC Board inside the Re- mote Control (RC6010), will reverse the logic so a closure is required at the CSD input for normal operation and an open for CSD.

For the Standoff Control (SC11) used without the Remote Control (RC6010), the CNC input for CSD is through J40-10 and J40-11 or J11-1 and J11-2 of the Standoff Control (SC11). For the Power Sup- ply, corner current reduction is only available when using the Remote Control (RC6010). The CSD relay output at J42 is not used with the Power Supply.

If the problem is the CSD on all the time or none of the time disconnect the CSD input from the cutting machine, set Remote Control (RC6010) in- ternal switch SW1-1 OFF and jumper the CSD in- put pins at either J6 or J29 (J42 or J11 for Standoff Control (SC11). If CSD is on (display indicates three decimals) when the jumper is connected and off when the jumper is not connected, the prob- lem is with the cutting machine or the CNC cable. If jumping the CSD does not work, the Remote Control (RC6010) or Standoff Control (SC11) is faulty. If while using the Remote Control (RC6010) and Standoff Control (SC10) together, CSD works in the Remote Control (RC6010) but not the Stand- off Control (SC10) check for a low, less than 3 VDC., on the ribbon cable at J5-21. If not low, with CSD on, the Remote Control (RC6010) is faulty. If J5-21 is low, either the Standoff Control (SC10) is faulty or the ribbon cable is open.

P. 48 Volt Bias Test

1.Remove the remote cable from the Remote Control (RC6010), or the Standoff Control (SC11). Tempo- rally jumper TB2-1 to TB2-2 for enable.

For the Remote Control (RC 6010), measure for +48 +/-5 VDC from J37-16, 35 and 37 (+) to J37- 15,34 and 36 (-). If correct, Remote Control RC6010 is faulty.

For the Standoff Control (SC11), measure J41-3 and 4 (+) to J41-1 and 2 (-). If correct, Standoff Control (SC11) is faulty.

2.If the 48 VDC is not correct, go the Power Supply and measure for +48 +/- 5 VDC at J31-1 to 2 of the Bias PC Board. If correct, check for open in the Power Supply harness to J15 or the remote cable.

If 48 VDC is not correct, remove J31 from the Bias PC Board as and measure again (on the Bias PC Board). If correct, check for a short in the wiring harness of remote cable.

3.If 48 VDC is still incorrect check for 115 VAC at J30- 1 to J30-3 at the Bias PC Board. If correct, replace Bias PC Board. Also, check Fuse (F1), 3A 250v, on the Bias PC Board.

SERVICE TROUBLESHOOTING

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Manual 0-2533

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Thermal Comfort 3000 manual Volt Bias Test, Corner Slowdown CSD
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3000 specifications

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