Alpha Technologies XM2, XM2-HV, XM2-HP - Manual (Page 75)

4.8 Providing Power via Portable Generator or Inverter
In the event of an extended utility failure, an external AC or DC power supply can provide
backup power to the system. This backup power enables the power supply to continue
charging the batteries ensuring interrupted service to the network. Follow the documentation
and connection procedures listed below.
4.8.1 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).
4.8.2 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 (3-battery system) or 46.0Vdc
(4-battery system) 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!
75 017-805-B0-010 Rev. K2