Alpha Technologies XM3-HP Series - Technical Manual - Manual (Page 89)

89 017-882-B0-001 Rev. C2 (10/2013)
3.0
Operation
3.8 Providing Power via Portable Generator or Inverter
In the event of an extended utility failure, an external AC or DC power source can provide backup power
to the system. This backup power enables the Power Supply to continue charging the batteries ensuring
uninterrupted service to the network. Follow the documentation and connection procedures listed below.
3.8.1 DC Powering
The AlphaGen Portable Generator provides a convenient method of providing backup DC
power. Upon the loss of commercial AC power, the existing battery strings immediately supply
voltage to the Inverter Module. After some point of battery discharge, a portable generator can
be deployed to the site to supply power to the DC bus. For complete connection and operation
information of the AlphaGen Portable Generator, refer its operator’s manual (Alpha P/N 041-
028-B0).
3.8.2 AC Powering
Should it become necessary to power the CATV system with a portable AC generator, truck-
mounted AC generator or truck-mounted inverter, follow the procedures below for the protection
of service personnel and powering system equipment.
Connection Procedure:
1. Read the Smart Display to determine if there is output power to the system. If there is still
power to the system, check the battery voltage on the Smart Display:
• If the battery voltage is greater than 34.5VDC, then approximately one hour remains to
complete the changeover to generator power before the cable system loses power to its
customers.
• If the battery voltage is less than the previous numbers, move rapidly as there is not
much time until the system fails. However, exercise caution as there are dangerous
voltages in the system that can shock you or damage the cable amplifiers.
2. Verify the AC Input breaker from the utility powering system is in the OFF position. This
ensures that if power returns suddenly, you will not experience a surge in power. This also
ensures when the generator is connected it will not put AC voltage back onto the power
lines.
3. Properly ground the generator by connecting a #6 AWG wire from the grounding lug on the
output panel of the generator to either a driven ground rod or the strand ground on the pole
to which the Power Supply is mounted. If working with a ground-mounted Power Supply,
locate the grounding point inside the enclosure and clamp on to that point.
Grounding the generator is mandatory for safety and for proper operation of the Power Supply.
CAUTION!
3.0 Operation, continued