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6.5 Alarm Detection
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
367
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Digital Operator Display
Minor Fault Name
CE
MEMOBUS/Modbus Communication Error
Control data was not received correctly for two seconds.
Cause
Possible Solutions
Minor Fault
(H2-01 = 10)
A data error occurred due to noise.
• 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.
YES
Communication protocol is incompatible.
• Check the H5 parameter settings as well as the protocol setting in the controller.
• Ensure settings are compatible.
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).
Incompatible PLC software settings or there is a
hardware problem.
• Check the PLC.
• Remove the cause of the error on the controller side.
Communications cable is disconnected or damaged.
• Check the connector to make sure the cable has a signal.
• Replace the communications cable.
Digital Operator Display
Minor Fault Name
CrST
Cannot Reset
Cause
Possible Solutions
Minor Fault
(H2-01 = 10)
A fault reset command was entered while the Run
command was still present.
• Ensure that a Run command cannot be entered from the external terminals or option card during fault reset.
• Turn off the Run command.
YES
Digital Operator Display
Minor Fault Name
CyC
MECHATROLINK Comm. Cycle Setting Error
Comm. Cycle Setting Error was detected.
Cause
Possible Solutions
Minor Fault
(H2-01 = 10)
The controller is using a comm. cycle beyond the
allowable setting range for the MECHATROLINK
option.
Set the comm. cycle for the upper controller within the allowable setting range for the MECHATROLINK option.
YES
Digital Operator Display
Minor Fault Name
dEv
Speed Deviation (for Control Mode with PG)
The deviation between the speed detection value for the pulse input and the speed reference after speed agreement was reached
exceeded the setting value of F1-10 for the time set in F1-11 or longer when the Operation Selection at Deviation was set to continue
operation (F1-04 = 3).
Cause
Possible Solutions
Minor Fault
(H2-01 = 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).
The load is locked up.
Check the machine.
Parameter settings are inappropriate.
Check the settings of parameters F1-10 and F1-11.
Incorrect speed feedback scaling if terminal RP is
used as speed feedback input in V/f Control.
• Set H6-02 to value of the speed feedback signal frequency when the motor runs at the maximum speed.
• Adjust the speed feedback signal using parameters H6-03 through H6-05.
• Make sure the speed feedback signal frequency does not exceed he maximum input frequency of terminal RP.
The motor brake engaged.
Ensure the brake releases properly.
The torque limit is small for the load.
Increase the setting values of L7-01 to L7-04, the value of the torque limit from the analog input, or the value of the
torque limit set from the communication option.
Digital Operator Display
Minor Fault Name
dnE
Drive Disabled
Cause
Possible Solutions
Minor Fault
(H2-01 = 10)
“Drive Enable” is set to a multi-function contact
input (H1-
= 6A) and that signal was switched
off.
Check the operation sequence.
YES
Digital Operator Display
Minor Fault Name
doH
Damping Resistor Overheat
The temperature of the built-in damping resistor exceeded the set value.
Cause
Possible Solutions
Minor Fault
(H2-
= 10)
The capacity of the power supply is too small.
Increase the capacity of the power supply.
YES
The distortion in the power supply is too large.
Lower the impedance of the input power supply wiring.
A phase loss occurred in the input power supply.
Check the input power supply for phase loss or an imbalance in the interphase voltages.
SIEP_C710636_02B_1_0.book 367 ページ 2015年11月25日 水曜日 午後4時56分