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Operation Above 60 Hz
A motor produces more noise and vibration when it is operated at frequencies above 60 Hz. Also, when
operating a motor above 60 Hz, the rated limit of the motor or its bearings may be exceeded; this may void
the motor warranty.
Contact the motor manufacturer for additional information before operating the motor above 60 Hz.
Power Factor Correction
DO NOT connect a power factor correction capacitor or surge absorber to the three-phase output of the
GX9 ASD.
If the GX9 ASD is used with a motor that is equipped with a capacitor for power factor correction, remove
the capacitor from the motor.
Connecting either of these devices to the output of the GX9 ASD may cause the GX9 ASD to malfunction
and trip, or the output device may cause an over-current condition resulting in damage to the device or the
GX9 ASD.
Light Load Conditions
When a motor is operated under a continuous light load (i.e., at a load of less than 50% of its rated
capacity) or it drives a load which produces a very small amount of inertia, it may become unstable and
produce abnormal vibration or trips because of an over-current condition. In such a case, the carrier
frequency may be lowered to compensate for this undesirable condition (see Program Special
Carrier
Frequency).
Note:
For proper operation, the carrier frequency must be 2.2 kHz or above except when
operating in the Constant Torque, Variable Torque, or the 5-Point Setting modes.
Note:
See
F300
and for setting the carrier frequency above the derate threshold.
Motor/Load Combinations
When the GX9 ASD is used in combination with one of the following motors or loads, it may result in
unstable operation.
•
A motor with a rated capacity that exceeds the motor capacity recommended for the GX9 ASD.
•
An explosion-proof motor.
When using the GX9 ASD with an explosion-proof motor or other special motor types, lower the carrier
frequency to stabilize the operation. DO NOT set the carrier frequency below 2.2 kHz if operating the
system in the vector control mode.
Note:
For proper operation, the carrier frequency must be 2.2 kHz or above except when
operating in the Constant Torque, Variable Torque, or the 5-Point Setting modes.
•
If the motor is coupled to a load that has a large backlash or a reciprocating load, use one of the
following procedures to stabilize its operation.
•
Adjust the S-pattern acceleration/deceleration setting,
•
If in the Vector control mode, adjust the response time, or
•
Switch to the Constant Torque control mode.
12
for more information on setting the carrier frequency for normal operation
GX9 ASD Installation and Operation Manual
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