voltage cut over for SUA2200 UPS

[Anonymous user]

I am looking at the SUA2200 UPS and need it to have a cut over higher then 88v it would be great if it was 100v cut over but I can not find out if this can be changed from 82v to 88v or higher. Thank you for any help you can provide.

[Anonymous user]

I am looking at the SUA2200 UPS and need it to have a cut over higher then 88v it would be great if it was 100v cut over but I can not find out if this can be changed from 82v to 88v or higher. Thank you for any help you can provide.

[BillP]

Hi mepatuhoo,

The Smart-UPS family has adjustable transfer points on both the high and low side. These can be adjusted most easily via our PowerChute Business Edition software or a Network Management Card installed in the UPS.

Smart-UPS will first attempt to "boost" the incoming voltage if it reaches the UPS too low. If the voltage arrives too low to boost up near the nominal output voltage of 120v, the UPS will then transfer over to battery until the incoming voltage improves back to at least the adjustable boost range.

The same happens on the high side when voltage is too high when it reaches the UPS. We call that "trim".

Boost and Trim are the modes of AVR, or Automatic Voltage Regulation, technology implemented into this product.

By default, your 120v "4G" Smart-UPS has these low transfer points:
On Line to AVR Boost 106
AVR Boost to On Battery 82
On Battery to AVR Boost 87
AVR Boost to On Line 112

...and these high transfer points:
OnLine to AVR Trim 127
AVR Trim to On Battery 144
On Battery to AVR Trim 141
AVR Trim to On Line 122

You can reference this [kBase 715|http://nam-en.apc.com/cgi-bin/nam_en.cfg/php/enduser/std_adp.php?p_faqid=715] to see how adjusting the high and low transfer points affects the transitions from online, to boost/trim, and to battery... and back the other direction.

So while the UPS may be receiving high or low voltages from utility, it always attempts to adjust or correct the output voltage via boost/trim or by switching to battery.

With the default settings, the lowest voltage your equipment would ever see is approx 103v, which is 83v * 24% boost. If the voltage reaches 82v, the UPS will switch to on-battery and output a steady 120vAC.

If you have any other questions, please let us know.

[Anonymous user]

I am being told by another worker that the unit we will need should be at 100v lowend so if it get below 100v that it kicks into battery is this possible to do on this unit?

[BillP]

Keep in mind that your 100v requirement is for the output of the UPS, which is reasonable as most equipment won't run with anything less.

Your UPS, with its default settings, will not output anything lower than 103v, even if the input voltage is as low as 83v. Input voltage below 83v will force the UPS on-battery, which is a steady 120vAC output.

Remember that the UPS will boost (or trim) voltage if it's reaching the UPS outside of the acceptable output voltage range. It will try to boost or trim until 1) the voltage reaching the UPS is too low or too high to be adjusted on the fly, or 2) the input voltage returns to normal operating range to send UPS back to "normal" online mode.

[BillP]

Yes, that's right. Because it can take input voltages that are too low and "boost" them by up to 24%, the lowest voltage your load would "feel" would be about 103vAC. This is because the UPS will start "boosting" when input voltage reaches 106vAC by default. As input voltage continues to drop, the UPS will be boosting this voltage between 12-24% so that your load does not experience any voltages lower than 103.

If the input voltage were to reach as low as 83v, the UPS would be boosting by 24% which would give your attached load 103v, which is good.

If the voltage continues to fall below 83, the UPS will switch to battery operation, which always results in a steady 120vAC output until 1) the battery is exhausted or 2) the voltage returns to at least 87v, where the "boost" feature will again activate, thus yielding about 108v to your load.

[Anonymous user · Accepted solution]

JoeMomma wrote:
Keep in mind that your 100v requirement is for the output of the UPS, which is reasonable as most equipment won't run with anything less.

Your UPS, with its default settings, will not output anything lower than 103v, even if the input voltage is as low as 83v. Input voltage below 83v will force the UPS on-battery, which is a steady 120vAC output.

Remember that the UPS will boost (or trim) voltage if it's reaching the UPS outside of the acceptable output voltage range. It will try to boost or trim until 1) the voltage reaching the UPS is too low or too high to be adjusted on the fly, or 2) the input voltage returns to normal operating range to send UPS back to "normal" online mode.

Most decent IT equipment with a switch mode power supply should be fine down to 86v. 115v setting should accommodate Japan(100v) and India(127v) in addition to 110/120