Power-On Sequencing (Some Models) - Lenovo 46M4002 Installation And Maintenance Manual

Power-on sequencing (some models)

You can use the power-on sequence function to define a sequence for powering on the PDU outlets. You
can use Telnet and SNMP through the Ethernet port or HyperTerminal through the serial port to configure the
power-on sequence function.
Use the power-on sequence function for the following two scenarios:
• Device dependency There are applications that required the power-on sequence function. For example, a
system includes device A, device B, and device C and requires that device A is powered on first, then
device B, and then device C. If the devices do not follow the required sequence when powered on, the
system will not run correctly.
• Power-on in-rush current In-rush current might be a problem in some applications if you are powering on
multiple devices at the same time. In such applications, the power-on sequence function is required to
power on devices in user-definable sequences to limit in-rush current.
The PDU outlet numbering is shown in the following illustration. The PDU orientation is horizontal with the
Ethernet port on the left.
1 2 3 4
LAN
Ethernet port
The following illustration shows the design and implementation of the power-on sequence function.
To use the power-on sequence function, you must set the following parameters by using either a serial or
Ethernet interface:
• GlobalDelayTimer (range: from 0 - 3600 seconds; data type: integer). All PDU outlets are controlled by this
global timer. If GlobalDelayTimer is not set (equal to 0), the global delay function for all outlets is not
enabled.
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Chapter 5 Monitoring the power status
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