YASKAWA U1000 iQpump Drive, Technical Manual

Page: 382 / 706

Digital Operator Display Fault Name
The wrong motor code is set (Yaskawa motors
only)
• Enter the correct motor code for the PM being used into E5-01.
• For special-purpose motors, enter the correct data to all E5 parameters according to the test report
provided for the motor.
Load is too heavy
• Increase the load inertia for PM motor (n8-55).
• Increase the pull-in current during accel/decel (n8-51).
• Reduce the load.
• Use a larger motor and drive.
Load inertia is too heavy Increase the load inertia for PM motor (n8-55).
Acceleration and deceleration times are too
short
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Increase the S-curve acceleration and deceleration times (C2-01).
Speed response is too slow Increase the load inertia for PM motor (n8-55).
Digital Operator Display Fault Name
SvE
Zero Servo Fault
Position deviation during zero servo.
Cause Possible Solution
Torque limit is set too low Set the torque limit to an appropriate value using parameters L7-01 to L7-04.
Excessive load torque Reduce the amount of load torque.
Electrical signal interference along PG
encoder wiring
Check the PG signal for electrical signal interference.
Digital Operator Display Fault Name
UL3
Undertorque Detection 1
The current has fallen below the minimum value set for Torque Detection Level 1 (L6-02) for longer than
the allowable time (L6-03).
Cause Possible Solution
Parameter settings are not appropriate for the
load
Check the settings of parameters L6-02 and L6-03.
There is a fault on the machine side Check the load for any problems.
Digital Operator Display Fault Name
UL4
Undertorque Detection 2
The current has fallen below the minimum value set for Torque Detection Level 2 (L6-05) for longer than
the allowable time (L6-06).
Cause Possible Solution
Parameter settings are not appropriate for the
load
Check L6-05 and L6-06 settings
There is a fault on the machine side Check the load for any problems.
Digital Operator Display Fault Name
UL5
Mechanical Weakening Detection 2
The operation conditions matched the conditions set to L6-08.
Cause Possible Solution
Undertorque was detected and matched the
conditions for mechanical loss detection set to
L6-08
Check the load side for any problems.
Digital Operator Display Fault Name
Uv1
Control Circuit Undervoltage Fault
Voltage in the control circuit fell below the detection level:
• For 200 V class drives: approximately 175 V
• For 400 V class drives: approximately 350 V
Cause Possible Solution
Input power phase loss
• The main circuit drive input power is wired incorrectly.
• Correct the wiring.
6.4 Fault Detection
382 YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual