A16B-1212-0100-01 - Power Unit - FANUC

It is easy to mount and dismount the CNC power supply unit, because it
is designed to be mounted on, and connected directly to, the master printed–circuit board. All its AC inputs and DC outputs are linked via connectors.
Because this power supply unit has a built–in input unit function, it is not necessary to prepare a separate relay or input unit for switching the AC input on and off. The AC input can be connected directly to the power supply unit. The unit has an AC service outlet, which is switched on and off simultaneously with the power supply unit. This AC service outlet can be used to supply power to a unit such as a fan motor.
1. AC power supply display LED (green)
When an AC power source is connected to the power supply unit, the LED lights regardless of whether the unit is on or off.
2. Alarm display LED (red)
If the power supply unit is switched off because of an alarm condition due to a failure such as an output error, the alarm display LED lights and remains on until the alarm condition is cleared by pressing the OFF switch or shutting down the AC power supply.
3. ENABLE signal EN (output)
This TTL level signal indicates that all DC outputs are normal.
It becomes low if an output failure is detected in any circuit.
4. Power supply on/off control signal ON–OFF–COM (input)
If two switches are connected to this circuit as shown below, pressing the ON switch turns on the power supply unit, while pressing the OFF switch turns the unit off.
If an alarm occurs in the power supply unit, and the alarm display LED lights in red, however, pressing the ON switch will not turn on the power supply unit. In this case, it is necessary to remove the cause of the alarm and press the OFF switch. Pressing the OFF switch clears the alarm condition. Subsequently pressing the ON switch turns on the power supply
unit.
5. External alarm signal AL (input)
When a contact signal from another unit or external power supply becomes ”closed,” the ENABLE signal of this power supply unit becomes low, thus immediately turning off the power supply unit.
6. Alarm signal FA–FB (output)
This contact signal indicates the state of all DC outputs. The contact is open when all the DC outputs are normal. It is closed if an output failure is detected in any DC output circuit.
If an external alarm signal (item 5) is connected, the FA–FB contact opens, when all DC outputs are normal and the external alarm signal is ”open.” The contact closes when the external alarm signal becomes ”closed.”