Troubleshooting
7-15
A signal is being input to the multifunction analog input terminal A2.
When “0” (frequency bias) is set for constant H3-09 (Multi-function Analog Input Terminal A2 Function
Selection), a frequency corresponding to the terminal A2 input voltage (current) is added to the frequency ref-
erence. Check to be sure that the set value and analog input value are suitable.
If Motor Deceleration is Slow
The deceleration time is long even when a braking option is connected.
The following causes are possible.
"Stall prevention during deceleration enabled" is set.
When a braking option is connected, set constant L3-04 (Stall Prevention Selection during Deceleration) to 0
(disabled). When this constant is set to 1 (enabled), the braking option does not fully work.
The deceleration time setting is too long.
Check the deceleration time setting (constants C1-02 and C1-04).
Motor torque is insufficient.
If the constants are correct and there is no overvoltage fault, maybe then the motor's power limit is reached.
Consider increasing the motor capacity.
If the Motor Overheats
The load is too heavy.
If the motor load is too heavy and the motor is used continuously with a torque that exceeds the motor's rated
torque, the motor will overheat. Reduce the load amount by lowering the load. Also consider increasing the
motor capacity.
The ambient temperature is too high.
The motor rating is determined within a particular ambient operating temperature range. The motor will burn
out if it is run continuously at the rated torque in an environment in which the maximum ambient operating
temperature is exceeded. Lower the motor's ambient temperature to be within the acceptable ambient operat-
ing temperature range.
The withstand voltage between the motor phases is insufficient.
When the motor is connected to the Inverter output, a surge is generated between the Inverter output and the
motor coil. Normally the maximum surge voltage is up to three times the Inverter's input power supply voltage
(i.e., 1,200 V for 400 V class). Be sure to use a motor with a withstand voltage between the motor phases that
is higher than the maximum surge voltage.
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