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8 Setting the NT4G19EA Power Supply for 115 or 220 Vac Operation
Installing the Capacitor Interlocks (NT4G19EA Power Supply)
Each NT4G19EA Power Supply SRU in the system requires a capacitor interlock,
which prevents current buildup and thereby protects against shock. The system will
not operate if the interlocks are not installed.
The interlock is shipped with each Power Supply SRU and is installed on the back
of the cabinet shelf behind the SRU. Typically, each system has one Power Supply
SRU per cabinet, though the configuration may call for two to be installed in the
bottom shelves of every second cabinet.
To install the capacitor interlock, proceed as follows:
(1) Locate the capacitor interlock for the Power Supply SRU you are going to
(2) From the rear of the cabinet, place the capacitor interlock in its position on the
(3) Insert the Power Supply SRU into the designated shelf position as described in
(4) When the Power Supply is firmly in position, make sure that it is plugged into
(5) When the capacitor interlock is properly positioned, tighten the four screws.
(6) Unlatch the SRU and slide it forward. (If you are unfamiliar with the SRU
(7) Plug the SRU back in to make sure it is making proper connection with the
Practice 450-1011-201
install. It is typically taped to the outside of the SRU's packing material.
metal cover on the back of the shelf as shown in Fig. 6-3 (that is, over the four
tapped holes that correspond to the Power Supply's position in the cabinet).
There are four screws with the interlock. Start the screws in the holes, but do
not tighten them.
the procedure 'Installing the SRUs', later in this part.
the capacitor interlock, and that the capacitor interlock is properly aligned with
the SRU plug.
latches, section titled 'Removing an SRU from a Cabinet', later in this part.)
capacitor interlock. If not, reposition the interlock and repeat this test.
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