YASKAWA L1000A - Page 293

6.3 Fault Detection
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual 293
Troubleshooting
6
Digital Operator Display Fault Name
oFC51
Encoder Option Analog Circuit Error
Incorrect signal level (+2.5 V signal)
Cause Possible Solution
The PG option card is damaged. Replace the PG option card.
Digital Operator Display Fault Name
oFC52
Encoder Communication Timeout
Signal encoder timed out waiting to receive data
Cause Possible Solution
Encoder cable wiring is wrong. Correct the wiring.
Encoder cable is disconnected. Reconnect the cable.
Parameters for Encoder Selection (F1-50) are set to the
wrong values.
Set parameter F1-50 to the proper value.
Digital Operator Display Fault Name
oFC53
Encoder Communication Data Error
Serial encoder CRC checksum error
Cause Possible Solution
Encoder cable wiring is wrong. Correct the wiring.
Encoder cable is disconnected. Reconnect the cable.
Digital Operator Display Fault Name
oFC54
Encoder Error
Alarm reading EnDat absolute position data from encoder
(OR flag from EnDat error for overvoltage, undervoltage, etc.)
Cause Possible Solution
Power supply to encoder is wired incorrectly. Correct the wiring.
The power supply circuit of the PG option card is
damaged.
Replace the PG option card.
Digital Operator Display Fault Name
oH
Heatsink Overheat
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).
Cause Possible Solution
Surrounding temperature is too high.
• 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.
Load is too heavy.
• Measure the output current.
• Decrease the load.
• Lower the carrier frequency (C6-03).
Internal cooling fan is stopped.
• Replace the cooling fan. Refer to Cooling Fan Component Names on page 326.
• After replacing the drive, reset the cooling fan maintenance parameter (o4-03 = 0).
Digital Operator Display Fault Name
oH1
Heatsink Overheat
The temperature of the heatsink exceeded the drive overheat level. The overheat level is determined by drive capacity (o2-04).
Cause Possible Solution
Surrounding temperature is too high.
• 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.
Load is too heavy.
• Measure the output current.
• Lower the carrier frequency (C6-03).
• Reduce the load.
Digital Operator Display Fault Name
oH3
Motor Overheat Alarm (PTC thermistor input)
• The motor overheat signal to analog input terminal A1 or A2 exceeded the alarm detection level.
• Detection requires multi-function analog input H3-02 or H3-10 be set to “E”.
Cause Possible Solution
Motor thermostat wiring is fault (PTC thermistor input). Repair the PTC thermistor input wiring.
There is a fault on the machine side (e.g., the machine is
locked up).
• Check the status of the machine.
• Remove the cause of the fault.
Motor has overheated
• Check the size of the load, the accel/decel times, and the cycle times.
• Decrease the load.
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Adjust the preset V/f pattern (E1-04 through E1-10). This will mainly involve reducing E1-08 and E1-10.
• Be careful not to lower E1-08 and E1-10 too much, as this reduces load tolerance at low speeds.
• Check the motor rated current.
• Enter the motor rated current as indicated on the motor nameplate (E2-01).
• Ensure the motor cooling system is operating normally.
• Repair or replace the motor cooling system.
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