4–20kVA Users Guide P-164000669 4–20kVA Users Guide P-164000669—Rev 09 73
NOTE 1 NOTE Load imbalance between UPMs is <5%
NOTE 2 NOTE The UPS shuts down after a specified delay for overload conditions listed above.
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Following an outage, the UPS restarts automatically when AC input power returns (unless the auto restart
function has been disabled) and the load is supplied again.
Setting High Efficiency Mode
In High Efficiency mode, the UPS transfers to Online (or Battery) mode in less than 10 ms when utility fails.
Transfers to High Efficiency mode will be active after 5 minutes of Bypass voltage monitoring: if Bypass quality
is not in tolerance, then the UPS will remain in Online mode.
To set the High Efficiency mode:
1. Select Settings, In/Out settings, and High Efficiency mode (see Figure 65 ).
2. Select Enabled and Enter to confirm.
3. The UPS transfers to High Efficiency mode after 5 minutes.
NOTE If the input is not stable after enabling HE Mode, the UPS will monitor the input for 5
minutes but if it is stable to begin with, it will transfer immediately.
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The following settings are available for configuring Bypass operation (see Figure 65 ).
CAUTION
Changing the Bypass settings changes UPS behavior and may result in decreased protection.
Bypass Voltage Min Limit
The default disables a transfer to Bypass if the measured bypass voltage level is below the nominal output
voltage -12%. You can configure the setting for another voltage value. This setting can be overruled by the
“Protected Bypass” setting.
Bypass Voltage Max Limit
The default disables a transfer to Bypass if the measured bypass voltage level is above the nominal output
voltage +12%. You can configure the setting for another voltage value. This setting can be overruled by the
“Protected Bypass” setting.
Protected Bypass (Enabled)
Allows a transfer to Bypass only when Bypass is within the following specifications:
• Bypass voltage is between the “Bypass Voltage Low Limit” and “Bypass Voltage High Limit” settings
• Bypass frequency is within 5% of nominal frequency.
Unsynchronized Transfers
When Qualify Bypass is set to “Always” or “Always on Fault” you can select the interruption time when
transferring to bypass, default setting is “Half Cycle” but can be changed to “Full cycle”.
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The following battery settings enable battery tests, alarms and enable auto mode and (see Figure 67 ).
Return of AC Input Power
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