User Manual
EM100 Mini Inverter
105
¾ In 3-wire sequence control mode, 3-wire sequence run/stop control terminal is off, switch
it on.
● Motor can only run in one direction.
Reverse prohibited: When F00.15=1, inverter is prohibited to reverse.
● Motor reverses
The output phase sequence of inverter is not identical to that of motor input: When power is
off, the running direction of motor can be changed by switching any of the two connection
wires, or editing F00.14 without turning the power off.
7.2.3 Excessively Long Acceleration Time
●Excessively low setting of current limit
When setting overcurrent limit is enabled, if the output current of inverter reaches the
setting current limit (F07.01), then the output frequency will remain unchanged in the
process of acceleration, and it will rise continuously only until it is lower than the setting of
F07.01. Therefore, the acceleration time of motor is longer than the setting time. Check if
the setting of F07.01 is excessively low.
● If the setting acceleration time is too long, confirm its parameters.
7.2.4 Excessively Long Deceleration Time
● When dynamic brake enabled
¾ The brake resistance is too big. The dynamic brake power is too small, so the
deceleration time is prolonged.
¾ The setting value (F06.12) of brake duty ratio is too small, and the deceleration time is
prolonged. Increase the setting value of brake duty ratio.
¾ The setting deceleration time is too long, confirm its parameters.
● When overvoltage stall protection enabled
¾ Overvoltage stall protection acts, when DC bus voltage exceeds overvoltage stall point
(F07.06), the output frequency remains unchanged. When it is below overvoltage stall
point (F07.06), the output frequency drops continuously. Therefore, the deceleration time
is prolonged.
¾ The setting deceleration time is too long, check its parameters.
7.2.5 Inverter Overheating
● Excessively heavy load
¾ Heavy load makes inverter work beyond its rated current for a long time. The power of
inverter shall be applicable to that of motor.
¾ The motor rotor is blocked due to the failure of motor or load.
●Excessively high ambient temperature
When the ambient temperature of inverter exceeds the permitted value, the temperature
might exceed the permitted highest value of inverter when it works in the rated status.
7.2.6 EMI and RFI
● When inverter runs in high frequency switch status, it will generate EMI and RFI to
the control devices. Take following countermeasures:
¾ Lower the carrier frequency (F00.17) of inverter.
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