Replacing Power Supplies 39
Chapter 3: Hardware and Servicing
Replacing Power Supplies
The ISG 2000 supports two redundant, fault-tolerant and auto-switching power
supplies. The power supplies are hot-swappable, so you can remove or replace one
power supply without interrupting device operation.
You can order the ISG 2000 with one or two power supplies: DC and AC. Although
the ISG 2000 can run with one power supply, it is advisable to install two. This
practice minimizes the chance of system failure due to an individual power supply
failure.
When the ISG 2000 contains two power supplies, they share the power load equally.
If one power supply fails, the other assumes the full load automatically and the
device sends a system alarm. The Power LED only displays two colors: green,
indicating that the power supply is functioning correctly and red, which indicates
that the power supply has failed.
Replacing AC Power Supplies
The AC power supply weighs about three pounds. The faceplate contains a power
LED, a power switch, a cooling fan vent, a male power outlet, a handle, and two
thumbscrews.
Figure 26: AC Power Supply
To install and connect the AC power supply, perform the following tasks. (If you
need to replace an DC power supply, see “Replacing DC Power Supplies” on
page 41.)
1. Turn off the power supply.
2. Unplug the cord from the power supply.
3. Turn the thumbscrews on the sides of the power supply counterclockwise to
release it.
WARNING: Do not mix the power supply types because it could seriously damage
the device.
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