Toshiba VT130G1 - Manual (Page 21)

Section 5
Initial Operation
1. Initial conditions before power up:
a) Frequency pot. (speed adjustment) should be at minimum setting.
b) Fdrward/Reverse switch (if used) in forward position.
2. Energizing the input terminals will charge the DC bus in the power unit and the
charge LED will come on.
3. Run the inverter without connecting motor. Make sure frequency is going up. Stop
inverter and turn off the breaker.
4. Connect the motor.
5. Adjusting the speed pot. slightly CW should start the motor turning, if motor runs
backwards: stop inverter, turn off power, and reverse any two output leads U, V, W to
correct direction.
6. Forward/Reverse (If used) should be checked while motor is running. Engage switch
to reverse, motor should stop, and reverse direction to the same speed it was
running in forward.
7. increase speed to full speed slowly, watch motor operation. Leave setting at full
speed. Switch to STOP Motor should decelerate or coast without tripping off inverter.
Switch to RUN, motor should accelerate smoothly to full speed without tripping
inverter.
Variable Resistors (On Power Unit Control Board)
The variable resistors are adjusted to specification at the factory and should not be
touched unless necessary.
(Caution when adjusting)
1. Small-scale precision type variable resistors are used. Use a well insulated thin type
minus screwdriver.
2. When the power is on, a high voltage is applied to the parts on the printed circuit
board. Also, after the power is turned off. the large capacitor is charged for about
five (5) minutes.
WARNING
Do not touch any circuit while the CHARGE lamp Is on.
3. A digital counter and an oscilloscope are necessary for readjustment. Do not ground
the instruments when connecting and keep the input impedance of the instruments
over 10 K ohms.
4. When monitoring the waveform with an oscilloscope, turn off the power before
connecting or disconnecting the probe.
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