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.

Table 1. Suggested maximum lead lengths.

Model

PWM Carrier

NEMA MG-1-1998 Section IV Part 31

Frequency

Compliant Motors2

 

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

 

 

 

 

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.

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W7 ASD Installation and Operation Manual

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Toshiba W7 manual Lead Length Specifications, Startup and Test