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 Solution
The load is too heavy.
Reduce the load.
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 incorrect.
Check the settings of parameters F1-10 and F1-11.
The motor brake has 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
“Drive Enable” is set to a multi-function
contact input (H1-
oo
= 6A) and that
signal was switched off.
Check the operation sequence.
Digital Operator Display
Minor Fault Name
doH
Damping Resistor Overheat
The temperature of the built-in damping resistor exceeded the set value.
Cause
Possible Solution
• The capacity of the power supply is too
small.
• The distortion in the power supply is too
large.
• Increase the capacity of the power supply.
• 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.
Digital Operator Display
Minor Fault Name
EF
Forward/Reverse Run Command Input Error
Both forward run and reverse run closed simultaneously for longer than 0.5 s.
Cause
Possible Solutions
Sequence error
Check the forward and reverse command sequence and correct the problem.
Note:
When minor fault EF detected, motor ramps to stop.
Digital Operator Display
Minor Fault Name
EF0
Option Card External Fault
An external fault condition is present.
Cause
Possible Solutions
An external fault was received from the
PLC with F6-03 set to 3, which allows the
drive to continue running after an external
fault occurs.
• Remove the cause of the external fault.
• Remove the external fault input from the PLC.
There is a problem with the PLC program. Check the PLC program and correct problems.
Digital Operator Display
Minor Fault Name
EF1
External Fault (Input Terminal S1)
External fault at multi-function input terminal S1.
EF2
External fault (input terminal S2)
External fault at multi-function input terminal S2.
EF3
External fault (input terminal S3)
External fault at multi-function input terminal S3.
6.5 Alarm Detection
386
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
Summary of Contents for U1000 iQpump Drive
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