118
YASKAWA
TOEPC7106171FD FP605 DRIVE INSTALLATION & PRIMARY OPERATION
Code
Name
Causes
Possible Solutions
UL6
Underload or Belt Break Detected
The output current decreased less than the motor
underload curve set in
L6-14 [Motor Underload Level
@ Min Freq]
for longer than the time set in
L6-03
[Torque Detection Time 1]
.
Adjust the
L6-14
setting to set the output current to stay the level
more than the motor underload curve during usual operations.
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.
Uv3
Soft Charge Answerback Fault
The relay or contactor on the soft-charge bypass relay
is damaged.
•
Re-energize the drive.
•
If the fault stays, replace the control board or the drive.
•
Check monitor
U4-06 [PreChargeRelayMainte]
, which 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.
Air inside the drive is too hot.
Check the ambient temperature of the drive.
VLTS
Thermostat Fault
The digital input from the terminal set for
Thermostat
Fault [H1-xx = 88]
is active.
Examine the wiring or wait for the motor to cool.
◆
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 CANopen communication, set
F6-35 [CANopen Node ID
Selection]
correctly.
AUXFB
PI Aux Feedback Level Loss
The analog input from the terminal set to
H3-xx = 27
[MFAI Function Selection = PI Auxiliary Control
Feedback Level]
is more than 21 mA or less than 3
mA for longer than 1 s.
Repair transducer or wiring.
bAT
Keypad Battery Low Voltage
The keypad battery voltage is low.
Replace the keypad battery.
bb
Baseblock
An external baseblock command was entered through
one of the MFDI terminals Sx, and the drive output
stopped as shown by an external baseblock command.
Examine the external sequence and timing of the baseblock
command input.
bCE
Bluetooth Communication Error
The smartphone or tablet with DriveWizard Mobile is
too far from the keypad.
Move to 10 m (32.8 ft) or less from the keypad.
Note:
bCE
can occur when the smartphone or tablet is 10 m (32.8 ft)
or nearer to the keypad for different smartphone and tablet
specifications.
Radio waves from a different device are causing
interference with communications between the
smartphone or tablet and keypad.
Make sure that no device around the keypad uses the same radio
bandwidth (2400 MHz to 2480 MHz), and prevent radio
interference.
BuDif
Main Fdbk Lost, Using Diff Fdbk
Parameter
Y4-41 = 1 [Diff Lvl Src Fdbk Backup
Select = Enabled]
and the drive detected a wire-break
on the analog input terminal set for
PID Feedback
[H3-xx = B]
.
Examine the connection of the Main PID Feedback Transducer.
Main PID Feedback Transducer is broken.
Replace Main PID Feedback Transducer.
Bu-Fb
Main Fdbk Lost Using Backup Fdbk
The drive detected wire-break on the analog input
terminal set to
H3-xx = B [MFAI Function Selection
= PID Feedback]
.
Examine the connection of the Main PID Feedback Transducer.
