At 01:09 PM 3/31/2005, David wrote:
>here is the problem
>i have a micor compustation repeater requires about 8amps at 120 volts 60
>hrtz key down
>i have a tpn110b and tpn 1121a
>the TPN1110B is a 120 volt 60 hrtz input
>the TPN1121A is a 12 volt supply input
>choice one: build or find a ups to power the tpn1110b for 2 hours
Efficiency would be VERY bad.
>choice two: buy an astron rs50 with the batter charger and float charge
>enough batteries to run the repeater for 2 hours. also build a low voltage
>shut off switch so when the batteries reach 10.5 volts the repeater shuts off.
Go for #3.
Use an astron linear, or current limited switching supply (cooler) adjusted
to the battery's float voltage, and connect a deep cycle battery in parallel.
You can use a relay, with a resistor in series with the coil, to set the
dropout voltage. Short the resistor to pull in the relay and bring
everything back online once power is restored, or even better, use a 110V
relay to keep the resistor shorted when the input power is up.
When AC fails, then the resistor is back inline, and when the voltage falls
enough, then the relay disconnects the load.
Or #4, a smart controller like an RC-210 could detect this condition at a
programmable point, and inhibit transmit, switch power levels to conserve
power, or simply pull it's own plug.
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