Asd Characteristics; Over-Current Protection; Asd Capacity; Using Vector Control - Toshiba G7 Operation Manual

ASD Characteristics

Over-current Protection

Each G7 ASD model was designed for a specified operating power range. The ASD will incur a trip if the
design specifications are exceeded.
However, the ASD may be operated at 110% of the specified output-current range continuously or at
150% for a limited amount of time as indicated in the section titled
193. Also, the
F601).
When using the ASD for an application that controls a motor which is rated significantly less than the
maximum current rating of the ASD, the over-current limit (Thermal Overload Protection) setting will
have to be changed to match the application. For further information on this parameter, see
Thermal Protection #1 on pg.

ASD Capacity

The G7 ASD must not be used with a motor that has a significantly larger capacity, even if the motor is
operated under a small load. An ASD being used in this way will be susceptible to a high-output peak
current which may result in nuisance tripping.
Do not apply a level of input voltage to an ASD that is beyond that which the ASD is rated. The input
voltage may be stepped down when required with the use of a step-down transformer or some other type
of voltage-reduction system.

Using Vector Control

Using Vector Control enables the system to produce very high torque over the entire operating range
even at extremely low speeds. Vector Control may be used with or without feedback. However, using
feedback increases the speed accuracy for applications requiring precise speed control. Enabling the
Automatic Energy Savings further increases the efficiency of the G7 ASD while maintaining its robust
performance.
Vector Control is not capable of operating multiple motors connected in parallel.
See F015 on pg. 64

Local/Remote Operation

While running in the Local mode at a non-zero speed, if the RJ45 connector is removed from the EOI and
then reinserted, the ASD remains in the Local mode even though the Local LED is off (press Run to
illuminate the Local LED). The ASD output remains at the frequency of the Frequency Command field
at the time of the disconnect so long as the connector is disconnected.
Once reinserted, the reference frequency that was loaded into the EEPROM (not RAM) before the
disconnect will be the frequency to which the ASD output will return.
To prevent this condition, before disconnecting the RJ45 connector ensure that the ASD is off.
16
Overcurrent Stall Level may be adjusted to help with nuisance over-current trips (see
154.
for further information on using Vector Control.
Current/Voltage Specifications on pg.
Electronic
G7 ASD Operation Manual