Fuji Electric FRENIC-HVAC User Manual page 648

[ 21 ] Er7 Tuning error
Problem Auto-tuning failed.
Possible Causes
(1) A phase was missing (There was a
phase loss) in the connection
between the inverter and the
motor.
(2) V/f or the rated current of the
motor was not properly set.
(3) The wiring length between the
inverter and the motor was too
long.
(4) The rated capacity of the motor
was significantly different from
that of the inverter.
(5) The motor was a special type such
as a high-speed motor.
(6) A tuning operation involving
motor rotation (P04 = 2 or 3) was
attempted while the brake was
applied to the motor.
 For details of tuning errors, refer to Chapter 5, Section 5.7.9 "Function code basic settings and tuning <
2 >,  Tuning errors."
Preparation before running the motor for a test – Setting function code data."
What to Check and Suggested Measures
 Properly connect the motor to the inverter.
Check whether the data of function codes (F04, F05, H50 through
H53, P02, and P03) matches the motor specifications.
Check whether the wiring length between the inverter and the motor
exceeds 50 m.
(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 F37 to
"1").
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.
 Manually specify the values for the motor parameters P06, P07,
and P08.
 Disable both auto-tuning and auto-torque boost (set data of F37 to
"1").
 Disable both auto-tuning and auto-torque boost (set data of F37 to
"1").
 Specify the tuning that does not involve the motor rotation (P04 =
1).
 Release the brake before tuning that involves the motor rotation
(P04 = 2 or 3).
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