Toshiba T300MVi MEDIUM VOLTAGE, Instruction Manual

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Altitude and Temperature De-rating
Altitude Derate Chart **
Altitude % Amp Output Derate
3,300’ 0.0%
4,000’ 2.0%
4,500’ 3.3%
5,000’ 4.7%
6,000’ 7.5%
7,000’ 10.2%
8,000’ 12.9%
9,000’ 15.7%
10,000’ 18.4%
** Applications above 5000 feet may also require special magnetics. Consult Toshiba Engineering.
Temperature Derate Chart
Ambient Temperature % Amp Output Derate
40 C 0.0%
45 C 7.5%
50 C 15.0%
Motor Cable Length
Below are cable length guidelines for use with most standard industrial motors.
Suggested Maximum Output Cable Distances
AC Motor Voltage Drive Output Voltage Max lead length
without filter
2300 2400V 0-1000 ft
2300/4000 2400V 0-1000 ft
4000V or 2300/4000 4160V 0-1000 ft
(1) Older motors, or motors with marginal insulation systems, may require filters to help reduce the stress on
the insulation system. Consult Toshiba application engineering.
(2) Exceeding the peak voltage and allowable rise time of the motor insulation system will reduce motor life
expectancy. To insure good insulation life, consult with the motor supplier to determine motor insulation
ratings and allowable maximum output lead distance. Long lead lengths between the motor and drive may
require that filters be added to the drive output.
CAUTION