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Section 2: S540 site preparation and installation
S540 Power Semiconductor Test System Administrative Guide
2-22
S540-924-01 Rev. D / January 2019
Severe personal injury or death due to electric shock or electrocution may result if power is
not removed before working inside the cabinet. Always perform the lockout and tagout
procedure before opening the system cabinet. Also, never turn on the system until all
connections and safety grounds are installed.
To remove system power:
You must shut down the software and remove all power from the computer and the system (see
(on page 3-6)).
Before proceeding, you must make sure the power indicator on the front door is not
illuminated. See the following figure for an example of what the indicator looks like when
illuminated.
Figure 26: Indicator showing system power is still on
1.
Place the breaker for the power distribution unit (PDU) in the OFF position. The PDU is at the
back of the cabinet below the rear door. See the figure in
Power distribution unit connections and
(on page 4-10) for a simplified drawing of the PDU.
2.
If you are working in the system cabinet, disconnect the system cabinet line cord from the AC line
power receptacles.
3.
Verify that all power has been removed and discharged from the system cabinet by switching the
main power switch (on the front door of the cabinet) to the ON position and verify that the green
light does not illuminate. If the light does not come on, the power is off. Turn the main power
switch back to the OFF position.
4.
With the PDU breaker in the OFF position, lockout and tagout the system source power
connection by locking a padlock through the hasp that surrounds the PDU breaker.