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PP20: Can The PP20 Power Pack Be Operated At 50 hz?

Yes, the PP20 power pack can be operated at 220VAC and 50 hz.  Frequency has very little affect on the operation of the power pack, but the voltage does have a large effect.  The PP20 is designed to operate at 277VAC, so operating at a lower voltage will lower the current output on the low voltage side.

        AC Input        DC Output    DC Output After Energizing Relay
   220 volts @ 60 Hz    15 volts, 53 mA            15 volts, 13 mA
   220 volts @ 50 Hz    15 volts, 52 mA            15 volts, 12 mA
   240 volts @ 60 Hz    15 volts, 80 mA            15 volts, 40 mA
   240 volts @ 50 Hz    15 volts, 82 mA            15 volts, 42 mA
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