YASKAWA
TOEPC71061737D GA800 DRIVE INSTALLATION & PRIMARY OPERATION
149
Code
Name
Causes
Possible Solutions
Speed response is too slow.
Increase the value set in
n8-55
.
SvE
Zero Servo Fault
The value set in the torque limit is too small.
Adjust torque limit-related parameters
L7-01 to L7-04
.
The load torque is too large.
Decrease the load torque.
Noise interference along the encoder cable
Isolate the encoder cable from the drive output line or a different
source of electrical interference.
TiM
Keypad Time Not Set
There is a battery in the keypad, but the date and time
are not set.
Use the keypad to set the date and time.
UL3
Undertorque Detection 1
A fault occurred on the machine.
Example: There is a broken pulley belt.
Examine the machine and remove the cause of the fault.
The parameters are incorrect for the load.
Adjust
L6-02 [Torque Detection Level 1]
and
L6-03 [Torque
Detection Time 1]
settings.
UL4
Undertorque Detection 2
A fault occurred on the machine.
Example: There is a broken pulley belt.
Examine the machine and remove the cause of the fault.
The parameters are incorrect for the load.
Adjust
L6-05 [Torque Detection Level 2]
and
L6-06 [Torque
Detection Time 2]
settings.
UL5
Mechanical Weakening Detection 2
The drive detected undertorque as specified by the
conditions for mechanical weakening detection set in
L6-08 [Mechanical Fatigue Detect Select]
.
Examine the machine for deterioration.
Uv1
DC Bus Undervoltage
There is a phase loss in the drive input power.
Correct errors with the wiring for main circuit drive input power.
There is loose wiring in the drive input power
terminals.
Tighten the terminal screws to the correct tightening torque.
The drive input power voltage is changing too much.
•
Examine the input power for problems.
•
Make the drive input power stable.
•
If the input power supply is good, examine the magnetic
contactor on the main circuit side for problems.
There was a loss of power.
Use a better power supply.
The main circuit capacitors have become
unserviceable.
Examine the capacitor maintenance time in monitor
U4-05
[CapacitorMaintenance]
. If
U4-05
is more than 90%, replace the
control board or the drive. For information about replacing the
control board, contact Yaskawa or your nearest sales representative.
The relay or contactor on the soft-charge bypass relay
is damaged.
U4-06 [PreChargeRelayMainte]
shows the performance life of the
soft-charge bypass relay. If
U4-06
is more than 90%, replace the
board or the drive. For information about replacing the board,
contact Yaskawa or your nearest sales representative.
Uv2
Control Power Undervoltage
The value set in
L2-02 [Power Loss Ride Through
Time]
increased and the momentary power loss
recovery unit is not connected to the drive.
Connect the momentary power loss recovery unit to the drive.
There was a problem with the drive hardware.
•
Re-energize the drive.
•
If the fault stays, replace the control board or the drive. For
information about replacing the control board, contact Yaskawa
or your nearest sales representative.
Uv3
Soft Charge Answerback Fault
There is damage to the relay or contactor on the soft-
charge bypass relay.
•
Re-energize the drive.
•
If the fault stays, replace the control board or the drive.
•
Monitor
U4-06 [PreChargeRelayMainte]
shows the performance
life of the soft-charge bypass relay. If
U4-06
is more than 90%,
replace the board or the drive. For information about replacing
the control board, contact Yaskawa or your nearest sales
representative.
Air inside the drive is too hot.
Decrease the ambient temperature of the drive.
◆
Minor Faults/Alarms
This section gives information about the causes and possible solutions when a minor fault or alarm occurs. Use the
information in this table to remove the cause of the minor fault or alarm.
Code
Name
Causes
Possible Solutions
AEr
Station Address Setting Error
The node address for the communication option is not
in the permitted setting range.
•
For CC-Link communication, set
F6-10 [CC-Link Node Address]
correctly.
•
For MECHATROLINK communication, set
F6-20
[MECHATROLINK Station Address]
correctly.
•
For CANopen communication, set
F6-35 [CANopen Node ID
Selection]
correctly.
bAT
Keypad Battery Low Voltage
The keypad battery voltage is low.
Replace the keypad battery.