6.5 Alarm Detection
YASKAWA ELECTRIC
SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
257
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6
LED Operator Display
Minor Fault Name
CE
MEMOBUS/Modbus Communication Error
Control data was not received correctly for two seconds.
Cause
Possible Solutions
Minor Fault
(H2-
= 10)
A data error occurred due to noise.
• 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.
YES
Communication protocol is
incompatible.
• Check the H5 parameter settings as well as the protocol setting in the controller.
• Ensure settings are compatible.
YES
The CE detection time (H5-09) is set
shorter than the time required for a
communication cycle to take place.
• Check the PLC.
• Change the software settings in the PLC.
• Set a longer CE detection time (H5-09).
YES
Incompatible PLC software settings or
there is a hardware problem.
• Check the PLC.
• Remove the cause of the error on the controller side.
YES
Communications cable is disconnected
or damaged.
• Check the connector for a signal through the cable.
• Replace the communications cable.
YES
LED Operator Display
•
Minor Fault Name
CrST
Can Not Reset
During a fault, the fault reset signal was entered while a Run command was activated.
Cause
Possible Solutions
Minor Fault
Output
(H2-
= 10)
A fault reset was being executed while
the Run command was still enabled.
• Ensure that a Run command cannot be entered from the external terminals or option
card during fault reset.
• Turn off the Run command.
YES
LED Operator Display
Minor Fault Name
dEv
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.
Cause
Possible Solutions
Minor Fault
Output
(H2-
= 10)
Load is too heavy
Reduce the load.
YES
Acceleration and deceleration times are
set too short.
Increase the acceleration and deceleration times (C1-01 through C1-08).
YES
The load is locked up.
Check the machine.
YES
Parameter settings are inappropriate.
Check the settings of parameters F1-10 and F1-11.
YES
The motor brake engaged.
Ensure the brake releases properly.
YES
LED Operator Display
Minor Fault Name
EF
Forward/Reverse Run Command Input Error
Both forward run and reverse run closed simultaneously for over 0.5 s.
Cause
Possible Solutions
Minor Fault
Output
(H2-
= 10)
Sequence error
Check the forward and reverse command sequence and correct the problem.
Note:
When minor fault EF detected, motor ramps to stop.
YES
