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Confidential
Protection Circuit/Unit
❏ Short circuit protection (*1)
Shuts down when the output terminal (output power supply) is short circuited.
❏ Over-voltage protection (*1)
Protection circuit to prevent the output terminals from exceeding the rated voltage.
❏ Overheating protection (*1)
Shuts down when abnormal heat is detected in the power supply elements.
❏ Input power fuse
Shuts down the system when the input current exceeds existing values.
Because this may indicate a defect within the power supply, the entire power supply unit
must be replaced when the fuse blows.
*1: Unplug the AC cord ot turn off the main power switch if power shuts down from these
protection operation. Turn off the power for a certain period of time ( approximately 1
minute), then plug the AC cord or turn on the main power to reboot.
Others
The main power fun is changeable when the unit case is removed.
Electrical capacitance to the external devices
The table shown below shows the total electrical capacitance that can be provided to the devices
that receive their power supply from the board inserted to PCI slot, COM ports 1 and 2, the
keyboard, mouse, and the USB port. Make sure that the electrical current consumed does not
exceed the total capacitance listed in the table below for the +5V, +3.3V, +12V, -12V, and +24V
voltages.
Table 5-5 External Electrical Capacitance
Power supply
+5VDC
+3.3VDC
+12VDC
-12VDC
+24VDC
Rev.A
Application
PCI slot, COMport, keyboard, USB, FDD
PCI slot
PCI slot, DMD
PCI slot
Drawer
Developer's Guide SR-600
Total capacitance
2.8A
0.5A
0.7A
0.25A
0.5A, peak at 2.0A
Hardware Specifications 5-17
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