Alpha Technologies XM2-300CE-HP - Manual (Page 51)

4.0 Operation, continued
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 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:
Read the Smart Display to determine if there is output power to the system. If 1.
there is still power to the system, check the battery voltage on the Smart Display:
If the battery voltage is greater than 11.5Vdc 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.
Verify the AC Input breaker from the utility powering system is in the OFF 2.
position. This ensures that if power returns suddenly, you will not experience a
surge in power. This also ensures when you connect the generator it will not put
AC voltage back onto the power lines.
Properly ground the generator by connecting a #6 AWG wire from the grounding 3.
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!
After the generator is properly grounded, unplug the power supply from the 4.
convenience outlet inside the enclosure and plug the power supply input cable
into the generator output. Use an NEC or UL approved extension cord.
Start and operate the generator according to the generator operation manual. 5.
If the generator kilowatt rating is twice the Watts used by the power supply 6.
indicated on the Smart Display, leave the battery breaker on and the generator
will charge the batteries. If the generator fails, the power supply will continue to
provide battery backup. If the generator output is not approximately twice the
Watt rating indicated on the Smart Display, switch the battery switch off to reduce
the load on the generator if battery backup of the system is unavailable.
51 017-877-B1-001 Rev. A