Install a redundant remote on-off switch
Do these steps if you want to use the redundant remote on-off switch.
| Warning | |
|---|---|
   | ELECTRIC SHOCK CAN KILL
The plasma power supply contains dangerous electric voltages that can
seriously injure or kill you. Even if the plasma power supply is turned OFF, you
can still get a serious electric shock if the plasma power supply remains
connected to an electric power source.
Use extreme caution if you do diagnosis or maintenance tasks when the
plasma power supply remains connected to an electric power source and the outer
cover or panels are removed. All work that requires removal of the plasma power
supply outer cover or panels must be done by a qualified technician. Refer to
the Safety and Compliance Manual (80669C) for more safety
information.
|
A feature of the control Printed Circuit Board (PCB) is that it offers redundancy to a single remote on-off switch.
- A 24 VDC (500 mA) and return (GND) from the Computer Numerical Control (CNC) or controlling device to the expansion PCB are necessary for redundant remote on-off.
- Use a separate discrete cable between the redundant remote on-off input and the main control PCB.
- Move the jumper from pin 1 and pin 2 of the J27 connector to pin 2 and pin 3.
- Supply 24 V power from the CNC or controlling device to J4 pin 3 of the expansion PCB.
- Install a return (GND) from the CNC or controlling device to J4 pin 4 of the expansion PCB.
When the redundant remote on-off feature is selected, signals from two remote on-off switches are necessary for the plasma power supply to work.
When the redundant remote on-off switch is set to OFF (disabled), electric power
stays ON (active) to the following parts:
- Power-indicator Light Emitting Diode (LED) on the front of the plasma power supply
- Control PCB
- Control transformer (can be different on input and output)
- Input to the relay that controls the 48 V power supply
- 24 V power supply
- 120 V to the input side of the contactor or contactors
- 120 VAC
- 220 VAC on the power distribution PCB
- 120 VAC to the input side of the 40 V power relay
- 220 VAC to the input side of the cooler power relay