Troubleshooting - YASKAWA L1000A Quick Start Manual

8 Troubleshooting

8 Troubleshooting

General Fault and Alarms
Faults and alarms indicate problems in the drive or in the machine.
The drive indicates that an alarm has occurred with a code on the data display screen and a flashing ALM LED. The drive
output may be shut off depending on the alarm.
The drive indicates that a fault has occurred with a code on the data display screen and a lit ALM LED. The drive output
is always switched off immediately and the motor coasts to stop.
To remove an alarm or reset a fault, first figure out what cause the problem, take corrective action, and finally reset the
drive by pushing the RESET key on the operator or by cycling the power supply.
The table below lists the most important alarms and faults only. Please refer to the Technical Manual for a complete list.
Digital Operator AL FLT
Drive Baseblock

(bb)
Control Fault

(CF)
Control Circuit
Fault
(CPF02)

to
(CPF25)
A/D Conversion
Error

(CPF35)
Cannot Reset

(CrST)
Speed Deviation 
(for Control Mode
with Encoder)
(dEv) 
Rotation Direction
Fault

(dv3)
Rotation Direction
Fault

(dv4)
Overacceleration
Detection

(dv6)
PM Rotor Position
Estimation Error

(dv8)
EN 42
Possible Cause
The software baseblock function is assigned to one of
the digital inputs and the input is off. The drive does not
accept Up/Down commands during this time.
The torque limit was reached during deceleration for
longer than 3 s and one of the following was true:
• the load inertia is too big.
• the torque limit is too low.
• the motor parameters are set incorrectly.
There is a problem in the drive's control circuit.
An A/D conversion error or control circuit error
occurred.
Fault reset was input when the Up or Down command
was active.
F1-04 is set to 0, 1, or 2 and a speed deviation higher
than the value in F1-10 occurred longer than the time
set in F1-11.
F1-04 is set to 3 and a speed deviation higher than the
value in F1-10 occurred longer than the time set in F1-
11.
A speed deviation higher than 30% occurred while the
torque reference and acceleration direction are opposite.
Motor speed and speed reference directions are
opposite and a deviation larger than set in F1-19 occurs.
The car acceleration is higher than the value set in
parameter S6-10 for longer than the time set in S6-17.
• An invalid value resulted from Initial Pole Search.
• The encoder rotation direction setting in parameter
F1-05 has been changed and the motor is started
without repeating the encoder offset tuning before.
• Check the functions assigned to the digital input
terminals.
• Check the upper controller sequence.
• Check the load.
• Set the torque limit to the most appropriate setting
(L7-01 through L7-04).
• Check the motor parameters settings.
• Cycle the drive power supply.
• Initialize the drive.
• Replace the drive if the fault occurs again.
• Cycle power to the drive.
• Replace the control board or the entire drive if the
problem continues.
Turn off the Up and Down command and reset the
drive.
• Reduce the load.
• Decrease the acceleration and deceleration ramp.
• Check the mechanical system (lubrication, etc.)
• Check the setting of F1-10 and F1-11.
• Check the brake sequence to make sure the brake is
fully open when acceleration starts.
• Check the encoder wiring.
• Verify the encoder rotation direction. Perform an
offset tuning.
• Reduce the load.
• Check the brake sequence.
• Verify the encoder direction.
• Perform an encoder tuning.
• Check the brake sequence.
• Check the settings of o1-20, o1-21, and o1-22.
• Adjust acceleration and deceleration ramps.
• Check the value set to S6-10 is not too small.
• Repeat the setup process, or perform Stationary Auto-
Tuning or Initial Pole Search Auto-Tuning.
• Check the brake sequence. The brake should remain
applied during Initial Pole Search and whenever the
power supply is interrupted.
• Use a PG option card that is compatible with both
L1000A and an absolute encoder.
YASKAWA ELECTRIC TOEP C710616 33G AC Drive L1000A - Quick Start Guide
Corrective Action