5.3 Description of Function Codes 5.3.4 P codes (Motor 1 parameters)
High induction motor efficiency (premium efficiency motors)
A “top runner system” was established and made obligatory in Japan through the Energy Conservation Act in 2015,
and Fuji has since then been selling premium efficiency motors which conform to efficiency class IE3.
In comparison to conventional induction motors (IE1), premium efficiency motors (IE3) have the following features.
Table 5.3-10 Typical comparison of induction motors (IE1) and premium efficiency motors (IE3)
Premium efficiency motors (IE3)
Points to bear in mind and remedies for phenomena that occur when combining premium efficiency motors
(IE3) with inverters
If changing a combination of a conventional induction motor (IE1) and inverter to a premium efficiency motor (IE3)
and inverter, or if a conventional induction motor (IE1) driven by a commercial power supply is changed to a premium
efficiency motor (IE3) and inverter, the following phenomena may occur. These phenomena should be handled with
the remedies indicated.
• Overcurrent protection
[OC1] is triggered when
the motor starts.
• The frequency does not
increase.
• Motor thermal protection
[OL1] is triggered, and
continuous operation is no
longer possible at low
speed.
• Reduce torque boost (Fuji
Electric inverter function
code [F09]).
• Since the armature resistance tends
to drop as shown in Table 5.3-10
under acceleration, constant velocity,
and deceleration characteristics. In
the case of commonly used V/F
control, motor current increases, and
in the worst case, motor thermal
protection may be triggered.
• Overvoltage protection
[OV2] is triggered when
decelerating.
• Deceleration time
increases.
• Enable strong break
control under deceleration
characteristics (set Fuji
Electric inverter function
code [H71] to 1 or 2).
• Increase the deceleration
time (Fuji Electric inverter
function code [F08]).
• Or set torque limiting anti-
regenerative control (Fuji
Electric inverter function
code [H69]).
• Since the moment of inertia tends to
increase, regenerative energy
increases with the current
deceleration time in the case of
commonly used V/F control under
deceleration characteristics, and in
the worst case, overvoltage
protection is triggered.
• The equipment speed is
too fast, or the fan air flow
is too high.
• Readjust the rated slip
(Fuji Electric inverter
function code [P12])
(when slip compensation
enabled).
• Lower the set frequency
(when slip compensation
disabled).
• The rated slip has decreased, and
therefore if the machine conditions
are the same, the motor rotation
speed may become higher than
before.
• An [Er7] alarm occurred
during motor tuning.
• Reduce torque boost (Fuji
Electric inverter function
code [F09]).
• The armature resistance tends to be
lower than conventional induction
motors (IE1), and therefore at the
factory default torque boost (Fuji
Electric inverter function code [F09]),
the motor current will be high, and
an Er7 alarm may occur.
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