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TROUBLESHOOTING & REPAIR
| CONTROL BOARD LED CHART |
|
|
LED # | LED FUNCTIONS AND INDICATIONS |
| (Machine is ON) |
|
|
1 | Indicates that the mode switch (SW2) is in the CC mode. |
| When LED 1 is on, LED 6 should also be |
| illuminated. |
|
|
2 | Indicates that feedback voltage is present. This informa- |
| tion is used when the machine is in a CV mode. This LED |
| should get brighter as the output voltage is increased. |
|
|
3 | Indicates an input shutdown. The normally closed relay |
| CR2 will activate causing input contactor CR1 to open. |
| See Remote Control Leads Fault Protection |
| Shutdown, Shorted Rectifier Fault Protection and Idle |
| Shutdown Timer in the Operation Section. |
|
|
4 | Indicates an over current shutdown. See Over Current |
| Protection Shutdown in the Operation Section. |
|
|
5 | Indicates output current is present. |
|
|
6 | Indicates that the machine is in the CC mode. LED 6 |
| should be on whenever LED 1 is lit. |
|
|
7 | Indicates that the +16 VDC power supply is functioning. |
| This circuitry is located on the control board. |
|
|
8 | Indicates the control signal is being generated to control |
| the firing of the output SCRs. This signal is sent to the |
| firing board. This LED should get dimmer as the output |
| voltage is increased. This LED will normally be off when |
| the machine is in the constant current mode at open |
| circuit. |
|
|
9 | Indicates that the |
| This circuitry is located on the control board. |
|
|
10 | Indicates that 42 VAC is being supplied to the control |
| board from the control board T3 transformer. |
|
|
11 | Indicates that feedback voltage is present. This informa- |
| tion is used when the machine is in the CC mode. This |
| LED should get brighter as the output voltage is |
| increased. |
|
|
