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Thermal Comfort 3000 manual Power Supply Start Circuit, Remote Control Start Circuit

Models: 3000

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2.If the coolant conductivity indicator is not lit with the probe disconnected, measure between the Logic PC Board common (TP1) and J3-1. If the voltage measures below +12 VDC, replace the LED PC board. If the voltage measures above +12 VDC, replace the Logic PC Board.

K.Power Supply Start Circuit

NOTE

Refer to Appendix IX for Start Circuit Diagram.

The start signal enters the Merlin at J15-24(sig) and J15-25 (return) or if no remote is used it could be wired to TB2-3 & 4. From there it goes directly to the Logic PC Board. For troublshooting remove any remote con- nections from either J15 or TB2. Connect a jumper from TB2-1 to TB2-2 to enable the Merlin.

The RUN (D1) and READY (D2) leds on the Logic PC Board should be on. If The front panel TEMP led is green and the COOLANT PRESSURE led is on but READY is not on, the Logic PC Board is defective. If READY is on and RUN isn’t, check that RUN/SET/ PURGE is set to run. Measure for less than 1 VDC on the Logic PC Board J1-13 to J1-12. If correct the Logic PC Board is defective. If greater than 1 VDC, the RUN/SET/PURGE switch or wire connections to it are defective.

If RUN and READY are on, connect a jumper from TB2-3 to TB2-4. Logic PC Board START led, D3, should come on and gases start flowing. If not, check for less than 1 VDC at J1-19 to J1-18. If correct, Logic PC Board is defective. If greater that 1 V, wiring from TB2 to J1 is defective.

After the gases flow for the selected preflow time the W ON led should light and both the main contactor (W1 or W2) and PCR contactor should come on. If W ON does not light, even momentarly, the Logic PC Board is defective.

If W ON is on for a moment then off but neither W1 or W2 comes on even momentarly do the following:

The Logic PC Board has a circuit to monitor the power supply output voltage. If the circuit doesn't sense voltage in 75 ms, if the contactor doesn’t come on, it shuts off the power to the contactor which makes it hard to troublshoot. Connecting a jumper between TP4 and TP1 on the Logic PC Board disables the volt- age sensing circuit so W ON led stays on.

On the Logic PC Board, K2, sends 120 VAC to the Volt- age Selection PC Board (refer to Appendix VI). Relay K5 directs that voltage to either W1 or W2 depending on the level of incoming line voltage. If high, LED D38 on the Voltage Selection PC Board will be ON

and the 120 VAC should go to W2 otherewise it goes to W1. The first step is to measure for 120 VAC from Logic PC Board J2-9 to wire #110 (PCR coil, MC1 or MC2 coils). If no voltage, the Logic PC Board is faulty. If about 120 VAC is present, measure the voltage at the W contactor coil (W2 if LED on Voltage Selection PC Board is ON, or else W1). If about 120 VAC is present the contactor is faulty. If no voltage, check from wire #110 to J6-1 and J6-3 on the Voltage selec- tion PC Board. One of the two should have about 120VAC, if not check J6-5. If it measures 120VAC re- place the voltage selection PC Board. If there is no voltage at J6-5 but was on J2-9, there is a faulty con- nection (wire #23).

L. Remote Control Start Circuit

NOTE

Refer to Appendix IX for Start Circuit Diagram.

The start signal from the cutting machine controller enters the RC6010 at J29 or J6 and may be either a momentary closure (J29-1) or sustained closure (J29- 3). It passes through optical isolation circuits and, if the ENABLE is on and the station select input is ac- tive, lights internal led D103. If the Standoff Control (SC10) is not used, start goes to the remote cable at J37-9.

If the Standoff Control (SC10) is connected, then the start signal goes to it, active low at J5-13, lights inter- nal indicator D79 and starts the find height sequence. Once height is found the front panel PLASMA ON inicator comes ON. If FIND HT is not ON, the find height function is by passed and PLASMA ON comes on immediately. The start signal then is returned to the Remote Control (RC6010), active low on J7-17, and to the remote cable on J37-9 to the Power Supply re- mote connector J15-24 and TB2-3 and on to the Power Supply Logic PC Board.

If the Standoff Control (SC10) is installed and the sys- tem won’t find height the problem is in the Standoff Control (SC10), Remote Control (RC6010) or the in- terconnections to the cutting machine. Set FIND HT off, it the torch starts now the problem is in the Stand- off Control (SC10).

NOTE

Refer to Section 5, Customer/Operator Service, in the Standoff Control Instruction Manual.

If it doesn’t start open the cover of either the Standoff Control (SC10) or Remote Control (RC6010), which- ever one is on top, and disconnect the ribbon cable at J5 or J7. Then if the Power Supply will start the prob-

SERVICE TROUBLESHOOTING

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Manual 0-2533

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Thermal Comfort 3000 manual Power Supply Start Circuit, Remote Control Start Circuit
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3000 specifications

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