EM330D User Manual
A Special Purpose Inverter for Hoisting
94
Control terminals RUN, F/R=ON, the motor does not run.
The external terminal start/stop setting is disabled: Check the setting of F0-04.
Free stop terminal FRS=ON: Make FRS=OFF.
Control switch is disabled: Check control switch.
Setting reference input frequency=0: Increase reference input frequency.
Motor can run in one direction only.
Reverse prohibited: When F0-24=1, the reverse output is prohibited.
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 F0-08 when power is on.
9.2.3
Excessively Long Acceleration Time
Excessively low setting of current limit
When setting current limit is enabled, if the output current of inverter reaches its
setting current limit(FC-08), then, the output frequency will remain unchanged in
the process of acceleration, and it will rise continuously only until output current
is lower than the setting current limit. Therefore, the acceleration time of motor is
longer than the setting time. Check if the setting current limit of inverter is
excessively low.
If the setting acceleration time is too long, confirm its parameters.
9.2.4
Excessively Long Deceleration Time
When dynamic brake enabled
The brake resistance is too big. The dynamic brake power is too small, so the
deceleration time is prolonged.
The setting value (FC-16) of brake duty ratio is too small, and the deceleration
time is prolonged. Increase the setting value of brake duty ratio.
The setting deceleration time is too long, confirm its parameters.
When overvoltage stall protection enabled
Overvoltage stall protection acts, when DC bus voltage exceeds DC690V, the
output frequency remains unchanged. When it is below DC660V, the output
frequency drops continuously, therefore the deceleration time is prolonged.
The setting deceleration time is too long, please check its parameters.
9.2.5
Inverter Overheating
Excessively heavy load
Heavy load makes inverter work beyond its rated current for a long time. The
power of inverter shall be applicable to that of motor.
