Agilent 5DX Service Guide 4-7
5DX Series 3 Power Distribution Unit
High/Low Line Monitoring/Protection
The PDU monitors the AC “Mains” Power input voltage at initial turn-on and
during normal operation. The PDU provides High Line and Low Line protection.
The High Line Circuit is intended to guard against initial installation mis-wiring.
For example, if the system was ordered as a 208 volts ac input power option and
connected to 380 volts ac input, the PDU will not turn on. All of the switched
power equipment will be protected since the PDU will not turn on. However, any
equipment connected to the unswitched power will most likely blow fuses or be
subject to other damage as the unswitched power is unprotected.
The Low Line Circuit is intended to protect against line sags and line interrupts. If
the voltage falls below a specified limit, for greater than one cycle, the switched
outputs of the PDU will turn off. The PDU must be reset once the line has been
restored. Reset the PDU by turning the On/Off Switch off, wait for at least 15
seconds and then turn the PDU back on again. If the AC “Mains” Power line is
stable, the PDU will remain up and running, if the AC “Mains” Power line is
unstable then the PDU may shut off again. The intent of the Low Line Circuit is to
protect the 5DX System from damage since a low line drop-out may cause the
control circuitry of the 5DX System to lose data and communication with the XYZ
Stage Assembly.
If the AC “Mains” Power goes out for a period of time greater than 10 seconds, the
5DX System will turn on by itself when AC “Mains” Power is restored; however,
the Motion Driver Power Supply will not come on. This is to prevent the XYZ
Stage Assembly from moving until control has been re-established. The Motion
Driver Power Supply will need to be reset.
Emergency Shutdown
The PDU will not turn on unless the Emergency Stop loop is connected. Any break
in the Emergency Stop loop will cause the switched outlets of the PDU to turn off.
The PDU’s switched outputs can be turned off by depressing one of the Emergency
Stop Buttons. This will open the contact disconnecting all power connected to the
switched outputs. Unswitched output power will remain on.
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