YASKAWA CR700

Troubleshooting
6
6.5 Minor Faults/Alarms
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual 367
Code Name Causes Possible Solutions
EF8 External Fault (terminal S8)
MFDI terminal S8 caused an external fault through
an external device.
1. Find the device that caused the external fault and remove the
cause.
2. Clear the external fault input in the MFDI.
The wiring is incorrect. Correctly connect the signal line to MFDI terminal S8.
External fault [H1-08 = 2C to 2F] is assigned to
MFDI terminal S8 that is not in use.
Correctly set the MFDI.
Note:
If the drive detects this error, the terminal assigned to H2-01 to H2-05 = 10 [MFDO Function Select = Alarm] will be ON.
Code Name Causes Possible Solutions
EF9 External Fault (Terminal S9)
MFDI terminal S9 caused an external fault through
an external device.
1. Find the device that caused the external fault and remove the
cause.
2. Clear the external fault input in the MFDI.
The wiring is incorrect. Correctly connect the signal line to MFDI terminal S9.
External fault [H1-09 = 2C to 2F]is set to MFDI
terminal S9, but the terminal is not in use.
Correctly set the MFDI.
Note:
If the drive detects this error, the terminal assigned to H2-01 to H2-05 = 10 [MFDO Function Select = Alarm] will be ON.
Code Name Causes Possible Solutions
EF10 External Fault (Terminal S10)
MFDI terminal S10 caused an external fault through
an external device.
1. Find the device that caused the external fault and remove the
cause.
2. Clear the external fault input in the MFDI.
The wiring is incorrect. Correctly connect the signal line to MFDI terminal S10.
External fault [H1-10 = 2C to 2F] is set to MFDI
terminal S10, but the terminal is not in use.
Correctly set the MFDI.
Note:
If the drive detects this error, the terminal assigned to H2-01 to H2-05 = 10 [MFDO Function Select = Alarm] will be ON.
Code Name Causes Possible Solutions
EP24v External Power 24V Supply
The voltage of the main circuit power supply
decreased, and the 24 V power supply is supplying
power to the drive.
• Examine the main circuit power supply.
• Turn ON the main circuit power supply to run the drive.
Note:
• Set o2-26 [Ext. Power 24V Supply Display] to enable or disable EP24v detection.
• The drive will not output an alarm signal for this alarm.
Code Name Causes Possible Solutions
FAn Internal Fan Fault
The circulation fan has malfunctioned. • Examine circulation fan operation.
• Re-energize the drive and check if the fault still remains.
• Examine U4-03 [Cooling Fan Ope Time] and U4-04 [Cool
Fan Maintenance]. If the performance life of the circulation
fan is expired or if there is damage to the fan, replace the fan.
There is a problem with the power supply of the
electromagnetic contactor and the circulation fan.
• Re-energize the drive and check if the fault still remains.
• If the fault stays, replace the control board or the drive. For
information about replacing the control board, contact
Yaskawa or your nearest sales representative.
Note:
If the drive detects this error, the terminal assigned to H2-01 to H2-05 = 10 [MFDO Function Select = Alarm] will be ON.
Code Name Causes Possible Solutions
FWdL Fwd Limit (FWdL)
The terminal assigned to H1-xx = 31, 32 [MFDI
Function Select = Forward Travel Limit (N.O.),
Forward Travel Limit (N.C.)] is input, the Run
command has been disabled.
Turn OFF the Travel Limit to input the Reverse run command.
Note:
If the drive detects this error, the terminal assigned to H2-01 to H2-05 = 10 [MFDO Function Select = Alarm] will be ON.
Code Name Causes Possible Solutions
HCA High Current Alarm
The load is too heavy. • Decrease the load for applications with repetitive starts and
stops.
• Replace the drive with a larger capacity model.
The acceleration/deceleration time is too short. • Calculate the torque necessary during acceleration related to
the load inertia and the specified acceleration time.
• Increase the values set in C1-01 to C1-08 [Acceleration/
Deceleration Time] until you get the necessary torque.
• Replace the drive with a larger capacity model.