Fuji Electric FRN355VG1S-4J [1034/1046] 3 maximum availability factor for a load for elevators which provides intermittent operation or a load with a sufficient designed motor rating reduce the curren...

Fuji Electric FRN90VG1S-4J [1034/1046] 3 maximum availability factor for a load for elevators which provides intermittent operation or a load with a sufficient designed motor rating reduce the current by multiplying the equation by the maximum availability factor of the load
A-16
(3) Maximum availability factor
- For a load for elevators, which provides intermittent operation, or a load with a sufficient
designed motor rating, reduce the current by multiplying the equation by the "maximum
availability factor" of the load.
- The "maximum availability factor of an appliance" means the ratio of the capacity of the
harmonic generator in operation at which the availability reaches the maximum, to its total
capacity, and the capacity of the generator in operation is an average for 30 minutes.
- In general, the maximum availability factor is calculated according to this definition, but the
standard values shown in Table B.6 are recommended for inverters for building equipment.
Table B.6 Availability Factors of Inverters, etc. for Building Equipment (Standard Values)
Equipment
type
Inverter capacity
category
Single inverter
availability
200 kW or less 0.55
Air
conditioning
system
Over 200 kW 0.60
Sanitary pump ⎯⎯⎯ 0.30
Elevator ⎯⎯⎯ 0.25
Refrigerator,
freezer
50 kW or less 0.60
UPS (6-pulse) 200 kVA 0.60
Correction coefficient according to contract demand level
Since the total availability factor decreases if the scale of a building increases, calculating reduced
harmonics with the correction coefficient β defined in Table B.7 is permitted.
Table B.7 Correction Coefficient according to the Building Scale
Contract demand
(kW)
Correction
coefficient β
300 1.00
500 0.90
1000 0.85
2000 0.80
Note: If the contract demand is between two specified values listed in Table B.7, calculate the value
by interpolation.
Note: The correction coefficient β is to be determined as a matter of consultation between the
customer and electric power company for the customers receiving the electric power over
2000 kW or from the special high voltage lines.

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