Sinee EM500 - Excessively Long Acceleration Time; Excessively Long Deceleration Time

EM500 Open-Loop Vector Control Inverter User Manual
376

Coast-to-stop terminal FRS=ON: Switch FRS=OFF.

Control switch is disabled: Check control switch.

Setting reference input frequency= 0: Increase reference input frequency.
 Motor can only run in one direction.
Reverse prohibited: When F00.21=1, inverter reverse 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 on the output side of inverter.
9.3.3Excessively Long Acceleration Time

Excessively low setting of current limit
When current limit is enabled, if output current of inverter reaches its set current
limit, then output frequency will remain unchanged in acceleration, and it will rise
continuously only until output current is lower than the setting current limit. In this case,
the acceleration time of motor is longer than the set time. Check if the set current limit of
inverter is excessively low.

If the set acceleration time is too long, confirm its parameters.
9.3.4Excessively Long Deceleration Time

When energy consumption brake is enabled,

The brake resistance is too big. The energy consumption brake power is too
small, so the deceleration time is prolonged.

The set value of brake duty ratio (F15.32) is too small, and the deceleration
time is prolonged. Please increase the set value of brake duty ratio.

If the set acceleration time is too long, confirm its parameters.
 When overvoltage stall protection is enabled,

Overvoltage stall protection is enabled, when DC bus voltage exceeds the
overvoltage stall voltage (F07.07); output frequency remains unchanged. When
DC bus voltage is lower than the set value of F07.07, output frequency drops
continuously and therefore the deceleration time is prolonged.