YASKAWA V1000 Technical Manual page 267

Communications wiring is faulty, there is
a short circuit, or something is not
connected properly.
Programming error on the master side.
Communications circuitry is damaged.
Terminal resistance setting is incorrect.
LED Operator Display
Cause
A data error occurred due to noise.
Communication protocol is incompatible.
The CE 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.
LED Operator Display
CrST
Cause
Fault reset was being executed when a run
command was entered.
LED Operator Display
CyC
Cause
The controller is using a comm. cycle
beyond the allowable setting range for the
MECHATROLINK option unit.
LED Operator Display
dEv
Cause
Load is too heavy
Acceleration and deceleration times are
set too short.
The load is locked up.
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
• Check for wiring errors.
• Correct the wiring.
• Remove and ground shorts and reconnect loose wires.
Check communications at start-up and correct programming errors.
• Perform a self-diagnostics check.
• Replace the drive if the fault continues to occurs.
The terminal slave drive must have the internal terminal resistance switch set correctly.
Place DIP switch S2 to the ON position.
MEMOBUS/Modbus Communication Error
CE
Control data was not received correctly for two seconds.
• Check options available to minimize the effects of noise.
• Counteract noise in the control circuit wiring, main circuit lines and ground wiring.
• Reduce noise on the controller side.
• Use surge absorbers on magnetic contactors or other equipment causing the
disturbance.
• Use cables recommended by Yaskawa or another type of shielded line. The shield
should be grounded on the controller side or on the drive input power side.
• Separate all wiring for communications devices from drive input power lines. Install
an EMC noise filter to the input side of the drive input power.
• 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 CE detection time (H5-09).
• Check the PLC.
• Remove the cause of the error on the controller side.
• Check the connector for a signal through the cable.
• Replace the communications cable.
Can Not Reset
• Ensure that a run command cannot be entered from the external terminals or option
card during fault reset.
• Turn off the run command.
MECHATROLINK Comm. Cycle Setting Error
Comm. Cycle Setting Error was detected.
Set the comm. cycle for the upper controller within the allowable setting range for the
MECHATROLINK option unit.
Speed Deviation (for Simple V/f with PG)
According to the pulse input (RP), the speed deviation is greater than the setting in F1-10 for a time
longer than the setting in F1-11.
Reduce the load.
Increase the acceleration and deceleration times (C1-01 through C1-08).
Check the machine.
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
6.5 Alarm Detection
YES
YES
YES
YES
Minor Fault
(H2-oo =
10)
YES
YES
YES
YES
YES
Minor Fault
Output
(H2-oo =
10)
YES
Minor Fault
Output
(H2-oo =
10)
YES
Minor Fault
Output
(H2-oo =
10)
YES
YES
YES
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