6.8 Troubleshooting without Fault Display n Motor Rotates in the Opposite Direction from the Run Command Note: Check the motor specifications for the forward and reverse directions. The motor specifications will vary depending on the manufacturer of the motor. n Motor Rotates in One Direction Only n Motor is Too Hot Troubleshooting n Motor Stalls During Acceleration or With Large Loads 6 n Motor Will Not Accelerate or the Acceleration Time is Too Long SIEP C710606 33A OYMC AC Drive – J1000 User Manual 135 Cause Possible Solutions The drive is set for both 2-Wire and 3-Wire sequence at the same time.
• The drive is set for a 3-Wire sequence when one of parameters H1-03 through H1-05 is set to 0. • If the drive is supposed to be set up for a 2-Wire sequence, then ensure parameters H1-03 through H1-05 are not set to 0. • If the drive is supposed to be set up for a 3-Wire sequence, then H1- must be set to 0. Cause Possible Solutions Phase wiring between the drive and motor is incorrect. • Check the motor wiring. • Switch two motor cables (U, V, and W) to reverse motor direction. • Connect drive output terminals U/T1, V/T2 and W/T3 in the right order to the corresponding motor terminals U, V, and W. • Change the setting of parameter b1-14.
The forward direction for the motor is setup incorrectly. Typically, forward is designated as being counterclockwise when looking from the motor shaft (refer to the figure below). 1 2 1. Forward Rotating Motor (looking down the motor shaft) 2. Motor Shaft Cause Possible Solutions The drive prohibits reverse rotation. • Check parameter b1-04. • Set the drive to allow the motor to rotate in reverse (b1-04 = “0”). A Reverse run signal has not been entered, although 3- Wire sequence is selected. • Make sure that one of the input terminals S3 to S5 used for the 3-Wire sequence has been set for reverse. Cause Possible Solutions The load is too heavy.
If the load is too heavy for the motor, the motor will overheat as it exceeds its rated torque value for an extended period of time. Keep in mind that the motor also has a short-term overload rating in addition to the possible solutions provided below: • Reduce the load. • Increase the acceleration and deceleration times. • Check the values set for the motor protection (L1-01, L1-02) as well as the motor rated current (E2-01). • Increase motor capacity. The air around the motor is too hot. • Check the ambient temperature. • Cool the area until it is within the specified temperature range. Insufficient voltage insulation between motor phases.
When the motor is connected to terminals U/T1, V/T2, and W/T3, voltage surges occur between the motor coils and drive switching. Normally, surges can reach up to three times the drive input power supply voltage (600 V for 200 V class, and 1200 V for 400 V class). • Use a motor with voltage tolerance higher than the max voltage surge. • Use a motor designed to work specifically with a drive when using a 400 V class unit. • Install an AC reactor on the output side of the drive. The motor fan has stopped or is clogged. Check the motor fan. Cause Possible Solutions Load is too heavy. Take the following steps to resolve the problem: • Reduce the load. • Increase the acceleration time.
• Increase motor capacity. • Although the drive has a Stall Prevention function and a Torque Compensation Limit function, accelerating too quickly or trying to drive an excessively large load can exceed the capabilities of the motor. Cause Possible Solutions Frequency reference is too low. • Check the maximum output frequency (E1-04). • Increase E1-04 if it is set too low. Check U1-01 for proper frequency reference. Check if a frequency reference signal switch has been set to one of the multi-function input terminals. Check for low gain level set to terminal A1 (H3-03).