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Appendix C: System Overload Rating
The 1700 Series UPS is capable of supporting short duration overloads.
When operating in the On Line mode output overloading of 125% of the
rated output current can be supported for 1 minute, and 150% for 30
seconds. If the overload continues the unit will switch to bypass mode.
When in bypass mode the 1700 Series overload capacity is limited by
the input breaker. The following graph shows the response of the
breaker depending on the applied load. The two lines shown on the
graph represent the upper and lower limits of the breaker response. The
response of a particular breaker could fall anywhere between these two
lines.
If the load capacity of the breaker is exceeded the breaker will trip,
shutting down both the UPS and the attached loads. If the breaker’s
capacity is not exceeded the unit will continue to operate in the bypass
mode until the applied load is reduced. When the load on the UPS is
reduced to within the specified limits the UPS will automatically return to
On Line mode.