6.3 Fault Detection
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
O
FCSS
oFC52
Encoder Communication Timeout
Signal encoder timed out waiting to receive data
C a u s e
P o s s i b l e S o l u t i o n
Encoder cable wiring is wrong.
Correct the wiring.
Encoder cable is disconnected.
Reconnect the cable.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
O
FCS3
oFC53
Encoder Communication Data Error
Serial encoder CRC checksum error
C a u s e
P o s s i b l e S o l u t i o n
Encoder cable wiring is wrong.
Correct the wiring.
Encoder cable is disconnected.
Reconnect the cable.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
oFC54
oFC54
Encoder Error
Alarm reading EnDat absolute position data from encoder
(OR flag from EnDat error for overvoltage, undervoltage, etc.)
C a u s e
P o s s i b l e S o l u t i o n
Power supply to encoder is wired incorrectly.
Correct the wiring.
The power supply circuit o f the PG option card is
damaged.
Replace the PG option card.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
oH
oH
Heatsink Overheat
The temperature o f the heatsink exceeded the overheat pre-alarm level set to L8-02. Default value for L 8-02 is determined by
drive capacity (o2-04).
C a u s e
P o s s i b l e S o l u t i o n
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.
• R em ove anything near the drive that m ight be producing excessive heat.
Load is too heavy.
• Measure the output current.
• D ecrease the load.
• Lower the carrier frequency (C6-03).
Internal cooling fan is stopped.
• Replace the cooling fan. R efe r to C ooling F an C om pon en t N a m es on p a g e 2 7 7 .
• After replacing the drive, reset the cooling fan maintenance parameter (o4-03 = 0).
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
oH I
oH1
Heatsink Overheat
The temperature o f the heatsink exceeded the drive overheat level. The overheat level is determined by drive capacity (o2-04).
C a u s e
P o s s i b l e S o l u t i o n
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.
• R em ove anything near the drive that m ight be producing excessive heat.
Load is too heavy.
• Measure the output current.
• Low er the carrier frequency (C6-03).
• Reduce the load.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
O L i
oL1
Motor Overload
The electronic motor overload protection tripped.
C a u s e
P o s s i b l e S o l u t i o n
Load is too heavy.
Reduce the load.
C ycle times are too short during acceleration and
deceleration.
Increase the acceleration and deceleration times (C1-01 through C1-08).
A general purpose motor is driven below the rated speed
with too high load.
• Reduce the load.
• Increase the speed.
• If the motor is supposed to operate at low speeds, either increase the m otor capacity or use a motor specifically designed to
operate in the desired speed range.
The output voltage is too high.
• Adjust the user-set V /f pattern (E 1-04 through E 1-10) by reducing E1-08 and E1-10.
• D o not set E1-08 and E 1-10 too low. This reduces load tolerance at low speeds.
The wrong motor rated current is set to E 2 -0 1.
• Check the motor-rated current.
• Enter the value written on the motor nameplate to parameter E 2 -0 1.
The B ase Frequency is set incorrectly.
• Check the rated frequency indicated on the motor nameplate.
• Enter the rated frequency to E1-06 (Base Frequency).
Multiple motors are running o ff the same drive.
D isable the motor protection function (L1-01 = 0) and install a thermal relay to each motor.
The electrical thermal protection characteristics and
motor overload characteristics do not match.
• Check the motor characteristics.
• Correct the type o f motor protection that has been selected (L1-01).
• Install an external thermal relay.
The electrical thermal relay is operating at the wrong
level.
• Check the current rating listed on the motor nameplate.
• Check the value set for the motor rated current (E2-01).
Output current fluctuation due to power supply loss
Check the power supply for phase loss.
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YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual