YASKAWA L1000A Technical Manual page 264

6.3 Fault Detection
Digital Operator Display
Cause
Encoder cable wiring is wrong.
Encoder cable is disconnected.
Digital Operator Display
Cause
Power supply to encoder is wired incorrectly.
The power supply circuit of the PG option card is
damaged.
Digital Operator Display
Cause
Surrounding temperature is too high.
Load is too heavy.
Internal cooling fan is stopped.
Digital Operator Display
Cause
Surrounding temperature is too high.
Load is too heavy.
Digital Operator Display
Cause
Load is too heavy.
Cycle times are too short during acceleration and
deceleration.
A general purpose motor is driven below the rated speed
with too high load.
The output voltage is too high.
The wrong motor rated current is set to E2-01.
The maximum output speed is set incorrectly.
Multiple motors are running off the same drive.
The electrical thermal protection characteristics and
motor overload characteristics do not match.
The electrical thermal relay is operating at the wrong
level.
Output current fluctuation due to input phase loss
Digital Operator Display
Cause
Load is too heavy.
264
Encoder Communication Data Error
oFC53
Serial encoder CRC checksum error
Correct the wiring.
Reconnect the cable.
Encoder Error
oFC54
Alarm reading EnDat absolute position data from encoder
(OR flag from EnDat error for overvoltage, undervoltage, etc.)
Correct the wiring.
Replace the PG option card.
Heatsink Overheat
oH
The temperature of the heatsink exceeded the overheat pre-alarm level set to L8-02. Default value for L8-02 is determined by
drive capacity (o2-04).
• Check the temperature surrounding the drive. Verify temperature is within drive specifications.
• Improve the air circulation within the enclosure panel.
• Install a fan or air conditioner to cool the surrounding area.
• Remove anything near the drive that might be producing excessive heat.
• Measure the output current.
• Decrease the load.
• Lower the carrier frequency (C6-03).
• Replace the cooling fan.
• After replacing the drive, reset the cooling fan maintenance parameter (o4-03 = 0).
Heatsink Overheat
oH1
The temperature of the heatsink exceeded the drive overheat level. The overheat level is determined by drive capacity (o2-04).
• Check the temperature surrounding the drive.
• Improve the air circulation within the enclosure panel.
• Install a fan or air conditioner to cool the surrounding area.
• Remove anything near the drive that might be producing excessive heat.
• Measure the output current.
• Lower the carrier frequency (C6-03).
• Reduce the load.
Motor Overload
oL1
The electronic motor overload protection tripped.
Reduce the load.
Increase the acceleration and deceleration times (C1-01 through C1-08).
• Reduce the load.
• Increase the speed.
• If the motor is supposed to operate at low speeds, either increase the motor capacity or use a motor specifically designed to
operate in the desired speed range.
• Adjust the user-set V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10.
• Do not set E1-08 and E1-10 too low. This reduces load tolerance at low speeds.
• Check the motor-rated current.
• Enter the value written on the motor nameplate to parameter E2-01.
• Check the rated frequency indicated on the motor nameplate.
• Enter the rated frequency to E1-06 (Base Frequency).
Disable the motor protection function (L1-01 = 0) and install a thermal relay to each motor.
• Check the motor characteristics.
• Correct the type of motor protection that has been selected (L1-01).
• Install an external thermal relay.
• Check the current rating listed on the motor nameplate.
• Check the value set for the motor rated current (E2-01).
Check the power supply for phase loss.
Drive Overload
oL2
The thermal sensor of the drive triggered overload protection.
Reduce the load.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Refer to Cooling Fan Component Names on page
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
294.