Toshiba G7 ASD Characteristics

16 G7 ASD Operation Manual

ASD Characteristics

Each G7 ASD model was designed for a specified operating power range. The ASD will incur a trip if the

design specifications are ex ceeded.

However, the ASD may be operated at 110% of the specified output-current ra nge c ontinuously or at

150% for a limited amount of time as indicated in the section titled Current/Voltage Specifications on pg.

193. Also, the Overcurrent Stall Level may be adjusted to help with nuisance over-current trips (see

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 Electronic

Thermal Protection #1 on pg. 154.

The G7 ASD must not be used with a motor that has a significa ntly larger capacity, even if the mot or 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 enables the system to produce very high torque over the entire operating range

even at extremely low speeds . Ve cto r Con tro l may be used with or without feedback. However, using

feedback increases the speed accuracy for applications r eq u iring precise speed control. Enabling the

Automatic Energy Savings further increases th e 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 for further information on using Vecto r C o nt rol .

While running in the Local mode at a non-zero speed, if the RJ45 connector is removed from the EOI and

then reinserted, th e ASD remains in th e 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.