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System Grounding
Proper grounding helps to prevent electrical shock and to reduce electrical noise. The ASD is designed
to be grounded in accordance with Article 250 of the NEC or Section 10/Part One of the Canadian
Electrical Code (CEC).
The grounding conductor shall be sized in accordance with Article 250-122 of the NEC or Part One-
Table 6 of the CEC.
— The Metal Conduit Is Not An Acceptable Ground —
The input, output, and control lines of the system shall be run in separate metal conduits and each shall
have its own ground conductor.
ASDs produce high-frequency noise — take steps to avoid the negative effects of noise. Listed below
are some examples of measures that will help to combat noise problems.
•
DO NOT install the input power and output power wires in the same duct or in parallel with each
other, and do not bind them together.
•
DO NOT install the input/output power wires and the wires of the control circuit in the same duct
or in parallel with each other, and do not bind them together.
•
Use shielded wires or twisted wires for the control circuits.
•
Ensure that the grounding terminals (G/E) of the ASD are securely connected to ground.
•
Install noise filters as required.
Lead Length Specifications
Adhere to the 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.
Table 1
lists the suggested maximum lead lengths for the listed motor voltages. Lead lengths from the
ASD to the motor in excess of those listed in
ASD.
AC Motor
Voltage
600 V
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, Variable Torque, or the 5-Point Setting modes.
GX9 ASD Quick Start Guide
Table 1. Lead Length Specifications
PWM Carrier
NEMA MG1 Part 31
Frequency
Compliant Motors
< 5 kHz
5 kHz
Table 1
may require filters to be added to the output of the
600 ft.
300 ft.
NEMA MG1 Part 30
Compliant Motors
200 ft.
100 ft.
15
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