20 HX7+ ASD Installation and Operation Manual
HX7+ ASD Characteristics
Over-Current Protection
Each HX7+ ASD model was designed for a specified operating power range. The HX7+ ASD will incur a
trip if the design specifications are exceeded.
However, the HX7+ ASD may be operated at 120% of the specified output-current range for a limited
amount of time as indicated in the section titled
Voltage/Current and Thermal Specifications on pg. 230.
Also, the Over-Current Stall Level (F601) may be adjusted to help with nuisance over-current trips.
When using the HX7+ ASD for an application that controls a motor which is rated significantly less than
the maximum current rating of the HX7+ ASD, the over-current limit setting will have to be changed to
match the application. See
Electronic Thermal Protection #1 for further information on this ASD/motor
configuration.
HX7+ ASD Capacity
The HX7+ 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 HX7+ 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 HX7+ ASD that is beyond that which the HX7+ 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 HX7+ ASD while maintaining its
robust performance.
Vector Control is not capable of operating multiple motors connected in parallel.
See F015 on pg. 77 for further information on using Vector Control.
Local|Remote Operation
While running in the Local mode at a non-zero speed, if the RJ45 connector is removed from the keypad,
the HX7+ ASD remains in the Local mode running at the last commanded speed even though the
Local|Remote LED is off. The HX7+ ASD output remains at the frequency of the
Frequency Command
field at the time of the disconnect for the duration of the disconnect.
Once reinserted, the reference frequency goes to zero hz.
To prevent this condition, before disconnecting the RJ45 connector, ensure that the HX7+ ASD is off.
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