YASKAWA L1000A Technical Manual page 300

6.4 Alarm Detection
Digital Operator Display
Cause
A data error occurred due to noise.
Communication protocol is incompatible.
The Communication Fault Detection Time (H5-09)
is set shorter than the time required for a
communication cycle to take place.
Incompatible PLC software settings or there is a
hardware problem.
Communications cable is disconnected or damaged.
Digital Operator Display
Cause
A fault reset command was entered while the Up/
Down command was still present.
Digital Operator Display
Cause
Load is too heavy
Accel/decel ramp is too short.
The load is locked up.
Parameter settings are inappropriate.
The motor brake is not applied.
Digital Operator Display
Cause
Sequence error
Digital Operator Display
Cause
An external fault was received from the PLC with
F6-03 = 3 (causing the drive to continue running
when an external fault occurs).
There is a problem with the PLC program.
Digital Operator Display
Cause
An external device has tripped an alarm function.
Wiring is incorrect.
Multi-function contact inputs are set incorrectly.
300
MEMOBUS/Modbus Communication Error
CE
Control data was not received correctly for two seconds.
• Check options available to minimize the effects of noise.
• Take steps to counteract noise in the control circuit wiring, main circuit lines, and ground wiring.
• Reduce noise on the controller side.
• Use surge absorbers for the magnetic contactors or other components that may be causing the disturbance.
• Use only recommended shielded line. Ground the shield on the controller side or on the drive input power side.
• Separate all wiring for comm. devices from drive input power lines. Install an EMC noise filter to the drive input power supply.
• Check the H5 parameter settings as well as the protocol setting in the controller.
• Ensure settings are compatible.
• Check the PLC.
• Change the software settings in the PLC.
• Set a longer Communication Fault Detection Time (H5-09).
• Check the PLC.
• Remove the cause of the error on the controller side.
• Check the connector to make sure the cable has a signal.
• Replace the communications cable.
CrST Cannot Reset
• Ensure that a Up/Down command cannot be entered from the external terminals or option card during fault reset.
• Turn off the Up/Down command.
Speed Deviation (when using a PG option card)
dEv
The deviation between the speed reference and speed feedback is greater than the setting in F1-10 for longer than the time in F1-11.
Reduce the load.
Increase the acceleration and deceleration times (C1-01 through C1-08).
Check the machine.
Check the settings of parameters F1-10 and F1-11.
Ensure the motor brake operates properly with a brake control command from the drive.
Up/Down Command Error
EF
Both forward run and reverse run closed simultaneously for over 0.5 s.
Check the forward and reverse command sequence and correct the problem.
Note: When minor fault EF detected, motor ramps to stop.
Option Card External Fault
EF0
An external fault condition is present.
• Remove the cause of the external fault.
• Remove the external fault input from the PLC.
Check the PLC program and correct problems.
External fault (input terminal S3)
EF3
External fault at multi-function input terminal S3.
External fault (input terminal S4)
EF4
External fault at multi-function input terminal S4.
External fault (input terminal S5)
EF5
External fault at multi-function input terminal S5.
External fault (input terminal S6)
EF6
External fault at multi-function input terminal S6.
External fault (input terminal S7)
EF7
External fault at multi-function input terminal S7.
External fault (input terminal S8)
EF8
External fault at multi-function input terminal S8.
Remove the cause of the external fault and reset the multi-function input value.
• Ensure the signal lines have been connected properly to the terminals assigned for external fault detection (H1- = 2C to 2F).
• Reconnect the signal line.
• Check if the unused terminals have been set for H1- = 2C to 2F (External Fault).
• Change the terminal settings.
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual