YASKAWA L1000A Technical Manual page 293

Digital Operator Display
oFC51
Cause
The PG option card is damaged.
Digital Operator Display
oFC52
Cause
Encoder cable wiring is wrong.
Encoder cable is disconnected.
Parameters for Encoder Selection (F1-50) are set to the
wrong values.
Digital Operator Display
oFC53
Cause
Encoder cable wiring is wrong.
Encoder cable is disconnected.
Digital Operator Display
oFC54
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
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).
Motor has overheated
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
Encoder Option Analog Circuit Error
Incorrect signal level (+2.5 V signal)
Replace the PG option card.
Encoder Communication Timeout
Signal encoder timed out waiting to receive data
Correct the wiring.
Reconnect the cable.
Set parameter F1-50 to the proper value.
Encoder Communication Data Error
Serial encoder CRC checksum error
Correct the wiring.
Reconnect the cable.
Encoder Error
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 Overheat Alarm (PTC thermistor input)
oH3
• 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".
• Check the status of the machine.
• Remove the cause of the fault.
• 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.
Fault Name
Possible Solution
Fault Name
Possible Solution
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
6.3 Fault Detection
326.
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