YASKAWA T1000A Technical Manual page 286

6.4 Fault Detection
Excessive braking load.
Surge voltage entering from the drive input power.
Ground fault in the output circuit causing the DC bus
capacitor to overcharge.
Improper Setting of Speed Search related parameters.
(Includes Speed Search after a momentary power loss
and after a fault restart.)
Drive input power voltage is too high.
The braking transistor is wired incorrectly.
PG cable is disconnected.
PG cable wiring is wrong.
Noise interference along the PG encoder wiring.
Drive fails to operate properly due to noise interference.
Load inertia has been set incorrectly.
Braking function is being used in OLV/PM.
Motor hunting occurs.
Digital Operator Display
Cause
There is phase loss in the drive input power while the
drive is running.
A Run command is entered while an alarm PF has been
triggered.
There is loose wiring in the drive input power terminals.
There is excessive fluctuation in the drive input power
voltage.
There is poor balance between voltage phases.
The main circuit capacitors are worn.
Digital Operator Display
Cause
PG cable is disconnected.
PG cable wiring is wrong.
PG has no power.
PG encoder brake is clamped shut.
Digital Operator Display
Cause
PG cable is disconnected.
Digital Operator Display
Cause
The proper braking resistor option has not been
installed.
Regenerative converter, regenerative unit, or braking
unit is being used.
286
The braking torque was too high, causing regenerative energy to charge the DC bus. Reduce the braking torque, use a braking
option, or lengthen decel time.
Install a DC reactor.
Note: Voltage surge can result from a thyristor convertor and phase advancing capacitor using the same input power supply.
• Check the motor wiring for ground faults.
• Correct grounding shorts and turn the power back on.
• Check the settings for Speed Search-related parameters.
• Enable Speed Search restart function (b3-19 greater than or equal to 1 to 10).
• Adjust the current level during Speed Search and the deceleration time (b3-02 and b3-03 respectively).
• Perform Stationary Auto-Tuning for line-to-line resistance and then enable Speed Estimation Speed Search (b3-24 = 1).
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
• Check braking transistor wiring for errors.
• Properly rewire the braking resistor device.
Reconnect the cable.
Correct the wiring.
Separate the wiring from the source of the noise (often the output lines from the drive).
• Review the list of possible solutions provided for controlling noise.
• Review the section on handling noise interference and check the control circuit lines, main circuit lines, and ground wiring.
• Check the load inertia settings when using KEB, overvoltage suppression, or Stall Prevention during deceleration.
• Adjust the load inertia ratio in S6-03 to better match the load.
Connect a braking resistor.
• Adjust the parameters that control hunting.
• Set the gain for Hunting Prevention (n1-02).
• Adjust the AFR time constant 1, 2 (n2-02 and n2-03).
• Adjust the speed feedback detection suppression gain for PM motors (n8-45) and the time constant for pull-in current (n8-47).
Input Phase Loss
PF
Drive input power has an open phase or has a large imbalance of voltage between phases. Detected when L8-05 = 1 or 4
(enabled).
• Check for wiring errors in the main circuit drive input power.
• Correct the wiring.
Remove the cause of the fault.
• Ensure the terminals are tightened properly.
• Apply the tightening torque as specified in this manual.
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive input power.
• Stabilize drive input power or disable phase loss detection.
• Check the maintenance time for the capacitors (U4-05).
• Replace the capacitor if U4-05 is greater than 90%. For instructions on replacing the capacitor, contact Yaskawa or your nearest
sales representative.
Check for anything problems with the drive input power. If drive input power appears normal but the alarm continues to occur,
replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your
nearest sales representative.
PG Disconnect (for any control modes using a PG option card)
PGo
No PG pulses are received for longer than the time set to F1-14.
Reconnect the cable.
Correct the wiring.
Check the power line to the PG encoder.
Ensure the motor brake releases properly.
PG Hardware Fault
PGoH
PG cable is not connected properly.
Reconnect the cable.
Braking Resistor Fault
rF
The resistance of the braking resistor being used is too low.
Select the braking resistor option so that fits to the drives braking transistor specification.
Disable the braking transistor protection selection (set L8-55 to 1).
Fault Name
Possible Solution
Refer to Wire Gauges and Tightening Torque on page 54
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual