6.3 If an Alarm Code Appears on the LED Monitor
6-13
[ 14 ] er7 Tuning error
Phenomenon: Auto-tuning failed.
(1) A phase was missing in the
connection between the inverter
and the motor.
➔ Properly connect the motor to the inverter.
(2) V/f or the rated current of the
motor was not properly set.
Check whether the data of function codes (F04*, F05*, H50, H51, H52,
H53, H65, H66, P02*, P03*) agree with the motor modes.
(3) The wiring length between the
inverter and the motor was too
long.
Check whether the wiring length between the inverter and the motor
exceeds 50 m (164 ft). Inverters with a small capacity are greatly
affected by the wiring length.
➔ Review, and if necessary, change the layout of the inverter and the
motor to shorten the connection wire. Alternatively, minimize the
wiring length without changing the layout.
➔ Disable both auto-tuning and auto-torque boost
(set data of function code F37* to “1”).
(4) The rated capacity of the motor
was significantly different from
that of the inverter.
Check whether the rated capacity of the motor is three or more ranks
lower, or two or more ranks higher than that of the inverter.
➔ Replace the inverter with one with an appropriate capacity.
➔ Set motor constants (function codes P06*, P07*, P08*) manually.
➔ Disable both auto-tuning and auto-torque boost
(set data of function code F37* to “1”).
(5) The motor was a special type
such as a high-speed motor.
➔ Disable both auto-tuning and auto-torque boost
(set data of function code F37* to “1”).
(6) Tuning (function code P04*=2)
operation was performed of
rotating a motor in a state that
brake is applied to the motor.
➔ Specify the tuning that does not involve the motor rotation
(function code P04* = 1).
➔ Perform the tuning (function code P04*=2) with the motor brake
released.
The explanations for function codes with an asterisk (*) are limited to motor 1. If using motor 2 to 4, replace
with the relevant function codes in Chapter 5 "Table 5.3-21 Function codes to be switched".
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