YASKAWA A1000 Technical Manual page 138

5.2 Fault Detection
Digital Operator Display
<1>
<2>
Cause
Parameter settings are not appropriate for the
load
There is a fault on the machine side
Digital Operator Display
<2>
Cause
Input power phase loss
One of the drive input power wiring terminals
is loose
There is a problem with the voltage from the
drive input power
The power has been interrupted
The main circuit capacitors are worn
The relay or contactor on the soft-charge
bypass circuit is damaged
138
SC IGBT Short Circuit or Ground Fault
Too Many Speed Search Restarts
SEr
The number of Speed Search restarts exceeded the value set to b3-19.
Motor Pull Out or Step Out Detection
STo
Motor pull out or step out has occurred. Motor has exceeded its pull-out torque.
Zero Servo Fault
SvE
Position deviation during zero servo.
Thermistor Disconnect
THo
The thermistor used to detect motor temperature has become disconnected.
Undertorque Detection 1
UL3
The current has fallen below the minimum value set for torque detection (L6-02) for longer than the
allowable time (L6-03).
Check the settings of parameters L6-02 and L6-03.
Check the load for any problems.
Undertorque Detection 2
UL4
The current has fallen below the minimum value set for torque detection (L6-05) for longer than the
allowable time (L6-06).
Mechanical Weakening Detection 2
UL5
The operation conditions matched the conditions set to L6-08.
Current Unbalance
UnbC
Current flow has become unbalanced.
DC Bus Undervoltage
Voltage in the DC bus fell below the undervoltage detection level (L2-05).
• For 200 V class drives: approximately 190 V
Uv1
• For 400 V class drives: approximately 380 V (350 V when E1-01 is less than 400)
• For 600 V class drives: approximately 475 V
The fault is output only if L2-01 = 0 or L2-01 = 1 and the DC bus voltage has fallen below the level set
to L2-05 for longer than the time set to L2-02.
• The main circuit drive input power is wired incorrectly.
• Correct the wiring.
• Ensure there are no loose terminals.
• Apply the tightening torque specified in this manual to fasten the terminals.
and Tightening Torque on page
• Check the voltage.
• Correct the voltage to be within the range listed in drive input power specifications.
• If there is no problem with the power supply to the main circuit, check for problems with the main
circuit magnetic contactor.
Correct the drive input power.
• Check the maintenance time for the capacitors (U4-05).
• Replace either the control board or the entire drive if U4-05 exceeds 90%. For instructions on replacing
the control board, contact Yaskawa or a Yaskawa representative.
• Cycle power to the drive and see if the fault reoccurs.
• If the problem continues, replace either the control board or the entire drive. For instructions on
replacing the control board, contact Yaskawa or a Yaskawa representative.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace either the control board or the entire drive if U4-06 exceeds 90%. For instructions on replacing
the control board, contact Yaskawa or a Yaskawa representative.
Fault Name
Possible Solution
Fault Name
Possible Solution
52.
YASKAWA ELECTRIC TOEP C710616 41B YASKAWA AC Drive - A1000 Quick Start Guide
Refer to Wire Gauges