The designer should carefully evaluate the UPS
application to anticipate problems and to adjust the
design accordingly. The problems associated with
UPS/load interaction can be reduced by:
the transient specifications of the UPS.
b. Using a UPS with operating characteristics that
will not cause the transformer to saturate.
MOTOR APPLICATION
a. Using a UPS capable of providing motor inrush
without current limiting.
b. Transferring the load bus to an alternate source
to start the motor and retransferring to the UPS
after the motor has started.
c. Oversizing the UPS so the motor load represents
a small portion of the UPS capacity.
d. Using a UPS with a modified inverter filter that
is compatible with synchronous motors.
OTHER NONLINEAR LOADS
a.
Using a UPS with a modified inverter filter.
b.
Oversizing the UPS.
c. Avoiding connection of electric discharge
lighting to the UPS. Other emergency sources should
be used for this lighting.
**************************************************************************
The UPS system shall be compatible with the load characteristics defined in
the LOAD PROFILE TABLE below and load configuration shown. Compensation
for UPS/load interaction problems resulting from nonlinear loads or
transformer and motor inrush shall be provided.
LOAD PROFILE TABLE
Type of load:
[_____].
Size of load:
[_____].
Switching pattern:
[_____].
Transient characteristics:
[_____].
Steady-state characteristics:
[_____].
Special factors:
[_____].
SECTION 16265A
Page 16