Alarm
code
Alarm
sub-
code
Name Description Check point and remedy reference
(Er7)
Tuning error
(1) The connection be-
tween the inverter and
the motor is missing
phases
→ Ensure a correct connection between
the inverter and motor.
(2) V/f settings and mo-
tor rated current are not
set correctly
Check that parameter (F04*, F05*, E166,
E167, E169, E170, E171, E172, E173, E174,
E175, E176, E177, E178, E179) data match-
es motor specifications.
(3) Wiring between the
inverter and motor is
too long
Check that wiring between the inverter and
motor does not exceed 50 m.
(Smaller inverter capacity will be more im-
pacted by wiring length)
→ Review layout so that wiring between
the inverter and motor can be made
shorter.
Alternatively, shorten wiring lengths as
much as possible.
→ Does not use automatic tuning, and
does not use automatic torque boost
(Set parameter E112*/E113*=0)
(Er7)
Tuning error
(4) Major discrepancy
between the inverter
rated capacity and the
capacity of the connect-
ed motor
Check that the capacity of the connected
motor is lower than three or more ranks of
the inverter rated capacity, or higher than
two or more ranks.
→ Review the inverter capacity
.
→ Manually set the motor constant (pa-
rameter P06*,P07*,P08*).
→ Does not use automatic tuning, and
does not use automatic torque boost
(Set parameter E112*/E113*=0)
(5) A special motor,
such as a high-speed
motor
→ Does not use automatic tuning, and
does not use automatic torque boost
(Set parameter E112*/E113*=0)
(6) Tuning operation
during which the motor
is rotated with the brake
applied (parameter
P04*=2) performed
→ Tune the motor while stopped (parame-
ter P04*=1).
→ Release the brake then tune the motor
(parameter P04*=2).
9 Troubleshooting
9-8
M1 Series Standard Type User's Manual (I669)
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