Grounding - Toshiba Adjustable Speed Drive H3 Operation Manual

Grounding

The inverter must be grounded in accordance with Article 250 of the National Electrical
Code or Section 10 of the Canadian Electrical Code, Part I and the grounding conductor
should be sized in accordance with 1996 NEC Table 250-95 or CEC, Part I Table 16. See
Installation Safety Precautions notes 7 and 14.
CAUTION
Motor Selection
1) Exceeding the peak voltage rating or the rise time allowable of the motor insulation
system will reduce the life expectancy. To insure good motor insulation life, consult
with the motor supplier as to determine motor insulation ratings and allowable maximum
output lead distance. Long lead lenghts between the motor and the drive may require
filters to be added to the drive output.
Suggested Maximum
AC Motor
Voltage
230 V
460 V
575 V
460 V
575 V
1
For lead lengths that exceed suggested maximum contact Toshiba for application
assistance.
2
Toshiba EQP III, III-XS & EQP III-841 motors incorporate an insullation system that
is in compliance with NEMA MG-1-1998 Section IV Part 31.
2) Bearing Considerations:
A. Motors operating from adjustable speed drive power sources tend to operate at
higher temperatures which may increase the need for more frequent lubrication
cycles.
TOSHIBA
Conduit is not a suitable ground for the inverter.
1
Output Lead Distance
PWM Carrier
Frequency
All
< = 5 kHz
> 5 kHz
< = 5 kHz
> 5 kHz
4 - 5
NEMA MG-1-1998 Section IV
2
Part 31 Compliant Motors
1000 ft.
600 ft.
300 ft.
200 ft.
100 ft.