6.3 Fault Detection
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
5 E3
SE3
Output Current Error
The output current was lower than 25% o f the motor no-load current during operation.
C a u s e
P o s s ib le S o l u t i o n
The motor contactor opened.
Check the contactor for any problems.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
5ЕЧ
SE4
Brake Feedback Error
The input terminal set for “Brake feedback” (Ш -П П = 79 ) did not respond within the SE4 error time set to S6-05 after an output
terminal set for “Brake release” (H 2 -D D = 50) closed.
C a u s e
P o s s ib le S o l u t i o n
The feedback contact on the brake is broken or the
wiring is incorrect.
Check the brake feedback contact and the wiring.
The brake control circuit does not work properly.
Ensure the motor brake operates properly with a brake control command from the drive.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
5uE
SvE
Position Lock Error
Position deviation during Position Lock.
C a u s e
P o s s ib le S o l u t i o n
Torque limit is set too low.
Set the torque limit to an appropriate value using parameters L7-01 to L7-04.
E xcessive load torque.
Reduce the amount o f load torque.
N oise interference along encoder wiring.
Check the encoder signal for noise interference.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
i f f
J
U L J
UL3
Undertorque Detection 1
The current has fallen below the minimum value set for torque detection (L 6-02) for longer than the allowable time (L6-03).
C a u s e
P o s s i b l e S o l u t i o n
Parameter settings are not appropriate for the load.
Check the settings o f parameters L 6-02 and L6-03.
There is a fault on the machine side.
Check the load for any problems.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
I I I
и
U L 1
UL4
Undertorque Detection 2
The current has fallen below the minimum value set for torque detection (L 6-05) for longer than the allowable time (L6-06).
C a u s e
P o s s i b l e S o l u t i o n
Parameter settings are not appropriate for the load.
Check the settings o f parameters L 6-05 and L6-06.
There is a fault on the machine side.
Check the load for any problems.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
I 1
i
U U 1
Uv1
DC Bus Undervoltage
One o f the follow ing conditions occurred w hile the drive was running:
• Voltage in the DC bus fell b elow the undervoltage detection level (L2-05)
• For 200 V class: approximately 190 V
• For 400 V class: approximately 380 V (350 V when E1-01 is less than 400)
C a u s e
P o s s ib le S o l u t i o n
Input power phase loss.
• The main circuit drive input power is wired incorrectly.
• Correct the wiring.
One o f the drive input power wiring terminals is loose.
• Ensure there are no loose terminals.
• Apply the tightening torque specified in this manual to fasten the terminals. R efer to W ire G auges a n d Tightening Torque on
p a g e 56
There is a problem with the voltage from the drive input
power.
• 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 w ith the main circuit magnetic contactor.
The power has been interrupted.
Correct the drive input power.
The main circuit capacitors are worn.
• Check the maintenance time for the capacitors (U4-05).
• Replace either the control board or the entire drive if U 4-05 exceeds 90%. For instructions on replacing the control board,
contact Yaskawa or a Yaskawa representative.
The relay or contactor on the soft-charge bypass circuit
is damaged.
• 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 U 4-06 for the performance life o f the soft-charge bypass.
• Replace either the control board or the entire drive if U 4-06 exceeds 90%. For instructions on replacing the control board,
contact Yaskawa or a Yaskawa representative.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
11 P
U U L
Uv2
Control Power Supply Voltage Fault
Voltage is too low for the control drive input power.
C a u s e
P o s s ib le S o l u t i o n
Control power supply wiring is damaged.
• Cycle power to the drive. Check if the fault reoccurs.
• If the problem continues, replace the control board, the entire drive, or the control power supply. For instructions on replacing
the control board, contact Yaskawa or a Yaskawa representative.
Internal circuitry is damaged.
• Cycle power to the drive. Check 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.
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YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual
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