Alpha Technologies VMX Series - Manual (Page 16)

16 017-940-B0-001, Rev. A
1.0 Introduction to the VMX Power Supply, continued
1.4 Optional Features
The following options can be factory installed, or upgraded in the fi eld by the user:
Local and Remote Indicator (LRI)
The LRI (red) lamp is located on the outside of pole-mount enclosures. During normal AC
line operation, the LRI remains off. The LRI comes on only when the power supply is running
in Standby Mode. Whenever a fault is detected during self-test, the LRI fl ashes to indicate
that service is required. The LRI is a simple form of status monitoring that allows operators to
check the operational status of the power supply without having to climb the pole and open
the enclosure (Alpha P/N: 740-139-20).
AC Indicator (ACI)
The AC Indicator (green lamp) is located next to the LRI on the outside of pole-mount
enclosures. As long as there is voltage present at the output, the ACI remains on. As with the
LRI, it acts as a simple form of status monitoring that allows cable technicians to check the
output status of the power supply without having to climb the pole and open the enclosure.
Alpha recommends using the ACI-LL (long life LED) because it provides much longer life
than the original light bulb design. Models for 60V and 90V are available. ACIs are not
recommended for ground mount enclosures (Alpha P/N: 740-167-21).
LA-P+ 240V (Lightning Arrestor)
The LA-P+ plugs directly into the enclosure’s convenience outlet, to provide additional
protection from voltage spikes caused by lightning and other power disturbances. It
eliminates the need for hard-wired MOVs. No additional wiring is necessary (Alpha P/N: LA-
P+240)
Utility safety ground must meet all local and national standards and regulations.
ATTENTION: