Proper voltage to Yamaha digital piano with Line-R

[Zeke77_apc]

This was originally posted on APC forums on 7/6/2009

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Hi,

I am using an international Yamaha digital Piano that has a selectable voltage switch. The four voltage positions are 110, 127, 220, and 240 volts.

My home voltage in Nevada as confirmed with a meter nominally runs at 122 volts.

I purchased an APC Line-R 1200 with user selectable input voltages of 110, 120, and 127 volts to see if I could better control the voltage into the piano.

I set the input voltage to 127 volts, to match the piano's 127v position, however, the output from the Line-R remains at 122 volts, no voltage boost. The Line-R voltage display on the front displays "green" normal and the piano works fine. Will the slightly lower output voltage from Line-R harm the piano?

I also tried setting the input voltage to 110 volts on the Line-R. In this mode the unit does in fact step down the voltage to 110 volts (confirmed by meter) however, a yellow light appears on the front indicating high input voltage. The piano now receiving spot on input voltage with it's selector switch set to 110v. I guess my question is this, will it hurt to have the Line-R run in it's corrective state for a long period of time? The unit is running very cool and all appears to be normal other than the yellow light indicating high input voltage.

Lastly, is it a problem to just set the Line-R to 120 volts and set the piano to 110 volts? I am a little worried of running 122 volts into a 110 volt transformer.

Thank you, just trying to protect a $3500 piano.

Message was edited by: Zeke77

Message was edited by: Zeke77

[BillP]

This reply was originally posted by Angela on APC forums on 7/7/2009

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i just know it boosts or trims the voltage by a certain percentage, noted in the manual:

http://www.apcmedia.com/salestools/ASTE-6Z7V37_R0_EN.pdf

[voidstar_apc]

This was originally posted on APC forums on 7/7/2009

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Digital power supplies aren't very sensitive to the input voltage. I think you'll be fine with the piano set to 127, line voltage at 122, and a good surge protector to keep the $3500 investment safe. The Line-R set to 120 would work fine as a surge protector. I'm not sure if there's any issues with setting it to 110... perhaps someone else here knows more.

[Zeke77_apc · Accepted solution]

This was originally posted on APC forums on 7/7/2009

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Thank you for the reply's and thanks for the info on digital power supply sensitivity. That eases my mind a bit. I do have the Line-R plugged into a 4000 joule surge protector. I think I will set everything to 127 volts since it is closest to my home voltage. I knew the Line-R output voltage regulation wasn't very tight before buying but was surprised to see no boost at all on 127 but spot on trim at 110. However, it is in fact operating within spec. Thanks again!