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16 W7 ASD Installation and Operation Manual
Lead Length Specifications
Adhere to the 2005 NEC and any local codes during the installation of ASD/Motor systems. Excessive
lead lengths may adversely effect the performance of the motor. Special cables are not required. Lead
lengths from the ASD to the motor in excess of those listed in
Table 1 may require filters to be added to
the output of the ASD. Table 1 lists the suggested maximum lead lengths for the listed motor voltages.
Note: Contact Toshiba for application assistance when using lead lengths in excess of those
listed.
Exceeding the peak voltage rating or the allowable thermal rise time of the motor
insulation will reduce the life expectancy of the motor.
For proper operation, the carrier frequency must be 2.2 kHz or above except when
operating in the Constant Torque or Variable Torque modes.
Startup and Test
Perform the following checks before turning on the unit:
• L1/R, L2/S, and L3/T are connected to the 3-phase input power.
• T1/U, T2/V, and T3/W are connected to the motor.
• The 3-phase input voltage is within the specified tolerance.
• There are no shorts and all grounds are secured.
Table 1. Suggested maximum lead lengths.
Model
PWM Carrier
Frequency
NEMA MG-1-1998 Section IV Part 31
Compliant Motors
2
230 Volt All 1000 feet
460 Volt
< 5 kHz 600 feet
≥ 5 kHz 300 feet
600 Volt
< 5 kHz 200 feet
≥ 5 kHz 100 feet