YASKAWA AC Drive-A1000 Technical Manual page 314

6.4 Fault Detection
Acceleration and deceleration times are too
short
Speed response is too slow
Digital Operator Display
Cause
Torque limit is set too low
Excessive load torque
Noise interference along PG encoder wiring
Digital Operator Display
Cause
Parameter settings are not appropriate for the
load
There is a fault on the machine side
Digital Operator Display
Cause
Parameter settings are not appropriate for the
load
There is a fault on the machine side
Digital Operator Display
Cause
Undertorque was detected and matched the
conditions for mechanical loss detection set to
L6-08
Digital Operator Display
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
314
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Increase the S-curve acceleration and deceleration times (C2-01).
Increase the load inertia for PM motor (n8-55).
Zero Servo Fault
SvE
Position deviation during zero servo.
Set the torque limit to an appropriate value using parameters L7-01 to L7-04.
Reduce the amount of load torque.
Check the PG signal for noise interference.
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).
Check the settings of parameters L6-05 and L6-06.
Check the load for any problems.
Mechanical Weakening Detection 2
UL5
The operation conditions matched the conditions set to L6-08.
Check the load side for any problems.
DC Bus Undervoltage
Voltage in the DC bus fell below the undervoltage detection level (L2-05).
Refer to the Undervoltage Protection row in the
Uv1
level values.
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.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
A.3 Drive Specifications
Possible Solution
58.
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
section on page 374 for detection
Refer to Wire Gauges