Troubleshooting
5
5.6 Minor Faults/Alarms
YASKAWA TOEPYAIH6B01A HV600 AC Drive Narrow Bypass Installation & Startup 133
Code Name Causes Possible Solutions
Electrical interference caused a communication data
error.
• Examine the control circuit lines, main circuit lines, and ground
wiring, and decrease the effects of electrical interference.
• Make sure that a magnetic contactor is not the source of the
electrical interference, then use a Surge Protective Device if
necessary.
• Use only recommended shielded line. Ground the shield on the
controller side or on the drive input power side.
• Separate the communication wiring from drive power lines, and
install a noise filter to the input side of the power supply for
communication.
• Decrease the effects of electrical interference from the controller.
The communication protocol is not compatible. • Examine the values set in H5-xx.
• Examine the settings on the controller side and correct the
difference in communication conditions.
The value set in H5-09 [CE Detection Time] is too
small for the communications cycle.
• Make sure that the settings are compatible.
• Change the software settings in the PLC.
• Increase the value set in H5-09.
The controller software or hardware is causing a
communication problem.
Examine the controller and remove the cause of the problem.
Note:
• This alarm is a different alarm from the standard CE [Modbus Communication Error]. The keypad will show this alarm only when H5-04 = 4 [Communication Error Stop Method
= Run at H5-34 (CE Go-To-Freq)]. If the drive cannot operate at the selected frequency, the keypad will show the standard CE alarm.
• The drive detects this error if it does not correctly receive control data for the CE detection time set to H5-09.
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
Code Name Causes Possible Solutions
CrST Cannot Reset
The drive received a fault reset command when a Run
command was active.
Turn off the Run command then de-energize and re-energize the
drive.
Code Name Causes Possible Solutions
CyPo Cycle Power to Accept Changes
Although F6-15 = 1 [Comm. Option Parameters
Reload = Reload Now], the drive does not update the
communication option parameters.
Re-energize the drive to update the communication option
parameters.
Code Name Causes Possible Solutions
dEv Speed Deviation
The load is too heavy Decrease the load.
Acceleration and deceleration times are set too short. Increase the values set in C1-01 to C1-04 [Acceleration/
Deceleration Time].
The dEv detection level settings are incorrect. Adjust F1-10 [Speed Deviation Detection Level] and F1-11 [Speed
Deviation Detect DelayTime].
The load is locked up. Examine the machine.
The holding brake is stopping the motor. Release the holding brake.
Note:
• The drive detects this error if the difference between the detected speed and the speed reference is more than the setting of F1-10 for longer than F1-11.
• If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will be ON.
• If the drive detects this error, the drive will operate the motor as specified by the stopping method set in F1-04 [Speed Deviation Detection Select].
Code Name Causes Possible Solutions
DIFF Differential Feedback Exceeded
The difference between the PID Feedback and
Differential Level Source [H3-xx = 2D] is more than
the level set in Y4-18 [Pre-Charge Loss of Prime
Level 2] for the time set in Y4-19 [Differential Lvl
Detection Time].
• Replace the feedback transducer or transducers.
• Set Y4-18 and Y4-19 correctly.
Note:
• If the drive detects this error, it will respond as specified by the setting of Y4-20 [Differential Level Detection Sel].
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
Code Name Causes Possible Solutions
dnE Drive Disabled
A terminal set for H1-xx = 6A [MFDI Function
Selection = Drive Enable] deactivated.
Examine the operation sequence.
Note:
If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
Code Name Causes Possible Solutions
EF
FWD/REV Run Command Input
Error
The drive received a forward command and a reverse
command at the same time for longer than 0.5 s.
Examine the forward and reverse command sequence and correct
the problem.
Note:
• If the drive detects EF, the motor will ramp to stop.
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
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