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The Inverter output voltage shall not deviate by more than +/- 1% RMS due
to the following steady state conditions:
a. 0 to 100% loading.
b. Inverter DC input varies from maximum to minimum.
c. Environmental condition variations within the limitations set in section
3.5.
4.3.3. Frequency Control
The Inverter output frequency shall be controlled by an oscillator internal to
the UPS module logic. It shall be capable of synchronizing to an external
reference (e.g.; the bypass source) or operating asynchronously. The
oscillator shall maintain synchronization with the external reference within
the limitations set in section 3.3.3. A message located on the touch screen
shall identify the loss of synchronization. Synchronization shall be
maintained at 60 Hz ± 0.01% continuously. The Inverter output frequency
shall not vary during steady state or transient operation due to the following
conditions:
a. 0 to 100% loading.
b. Inverter DC input varies from maximum to minimum.
d. Environmental condition variations within the limitations set in section
3.5.
4.3.4. Output Harmonic Distortion
The Inverter output shall limit the amount of harmonic content to the values
stated in section 3.4.8. The use of excessive or additional filtering shall not
be required to limit the harmonic content thus maintaining a high level of
efficiency, reliability and original equipment footprint.
4.3.5. Output Overload Capability
The Inverter output shall be capable of providing an overload current while
maintaining rated output voltage to the values stated in section 3.4.9. A
message indicating LED located on the control panel shall illuminate to
identify this condition. If the time limit associated with the overload
condition expires or the overload is in excess of the set current amplitude,
the load power shall be transferred to the bypass source without interruption.
4.3.6. Inverter Current Limit
The Inverter output shall also be limited to 150% of rated load current. The
two sensing locations shall operate separately and independently thus
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