Toshiba – Toshiba VF-SX User Manual

Page 19

Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".

4-2

TOSHIBA

If the drive is very lightly loaded (approximately 5*) or if the inertia

of the driven load is very small, the drive may become unstable. The

result could be abnormal vibration or overcurrent trip. If this condition

persists lower the PWM carrier frequency (parameter [C F]). See Chapter

12 for instructions.

Unstable results may occur if:

The output rating of the drive is less than the output rating of the

motor.

The drive is used with a motor with special ratings, such as an

explosion proof motor, or a motor specially built for high inertia

applications.

The drive is used with a pulsing load, such as a load requiring

repeated piston type operation.

3. The motor will coast to stop if the power is lost. If an immediate stop

or very quick deceleration of the motor is required use an auxiliary brake
device. Select the appropriate stopping method as described in Chapter 11

for an emergency stop.

4. GROUNDING

The inverter should be grounded in accordance with Article 250 of the
National Electrical Code or Section 10 of the Canadian Electrical Code,

Part I. The grounding conductor should be sized in accordance with NEC

Table 250-95 or CEC, Part I, Table 16.