Toshiba VF-SX - Manual (Page 68)

TOSHIBA 9-3
Do not touch any of the terminal blocks or any of the circuitry inside the
drive while the "CHARGE" LED Indicator is illuminated. An electrical
charge is maintained on the capacitor and other electrical components
while this lamp is lit. Treat this condition with respect.
Not all motors can be driven to speeds above the base frequency (50 HZ or
60 HZ) for which they are designed. The variable speed range should be
limited to a safe operating range, since any general purpose motor that
can be driven by the inverter is actually designed for constant speed
operation. At operation above 60 HZ with a general purpose motor expect
limits on bearing life, mechanical strength, vibration, noise, and other
motor design variables to affect operation. In general, only apply the
inverter within the guidelines shown in Table 9-1. Consult the motor
manufacturer for recommendations for motor operation beyond these
guidelines.
TABLE 9-1: MAXIMUM PERMISSIBLE MOTOR SPEEDS
Motor Frame Number Permissible Haxiimai Frequency (HZ)
Number of Poles
2 4 6
42T
60 120
_
48T
_
56T
120
140T
180T
210T