4
-12
Precautions After Using Rotational and Stationary Autotuning
•
After completing autotuning, set E1-04 (Max. output frequency) to the base frequency from the motor’s
nameplate.
•
In stationary autotuning, when the motor is first operated in the drive mode after tuning, the remaining
motor constants E2-02 (Motor rated slip) and E2-03 (Motor no-load current) are set automatically. To per-
form an operation immediately after stationary autotuning, use the following procedure under the recom-
mended conditions.
1. Check the values of E2-02 and E2-03 in verify mode or advanced programming mode.
2. Run the motor once in drive mode under the following conditions.
•
The Inverter and the motor are connected.
•
The motor shaft is not locked with a mechanical brake or other stopping mechanism (or function).
•
A motor-load ratio of 30% or less is maintained.
•
A speed of 30% or more of the base frequency set at E1-06 (default = highest frequency) is maintained
at a constant speed for one second or more.
3. After stopping the motor, check the values of E2-02 and E2-03 again in verify mode or advanced program-
ming mode. If the values of E2-02 and E2-03 differ from the ones before the first operation was carried
out, the settings have been successfully completed. Next, check if the values are suitable or not.
If the values of E2-02 and E2-03 differed greatly from the reference data of the motor in the test report or the
instruction manual, hunting, motor vibrations, insufficient motor torque, or an overcurrent may occur because
the motor is operated although the aforementioned conditions have not been fulfilled after stationary
autotuning. For elevators, failure to observe this caution may result in the cage falling or injury. If so, perform
stationary autotuning again and run the motor using the aforementioned procedure under the recommended
conditions or perform rotational autotuning.
Usually the standard setting for E2-02 is 1 Hz to 3 Hz, and that for E2-03 is 30% to 65% of the rated current
for a general-purpose motor. Generally, the larger the motor capacity is, the smaller the rated slip and the ratio
of the no-load current to the rated current become. Use the data given in
Factory Settings that Change with the
Inverter Capacity (o2-04)
of
Chapter 5 User Constants
as a reference.
