YASKAWA T1000A Technical Manual page 293

Digital Operator Display
Cause
Overshoot is occurring.
Incorrect speed feedback scaling if terminal RP is
used as speed feedback input in V/f control
Incorrect PG pulse number has been set
Inappropriate parameter settings.
Digital Operator Display
Cause
Surge voltage present in the drive input power.
The motor is short-circuited.
Ground current has over-charged the main circuit
capacitors via the drive input power.
Noise interference causes the drive to operate
incorrectly.
PG cable is disconnected.
PG cable wiring is wrong.
Noise interference along PG encoder wiring.
Digital Operator Display
PASS
Cause
MEMOBUS/Modbus test has finished normally.
Digital Operator Display
Cause
There is phase loss in the drive input power while the
drive is stopped.
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
PGo
Cause
PG cable is disconnected.
PG cable wiring is wrong.
PG encoder does not have enough power.
Brake is holding the PG.
Digital Operator Display
PGoH
Cause
PG cable is disconnected.
Digital Operator Display
Cause
A motor switch command was entered during run.
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
Overspeed
oS
The motor speed feedback exceeded the F1-08 setting.
• Reduce the settings for C5-01 (Speed Control Proportional Gain 1) and increase C5-02 (Speed Control Integral Time 1).
• If using a Closed Loop Vector mode enable Feed Forward Control and perform Inertia Auto-Tuning.
• Set H6-02 to value of the speed feedback signal frequency when the motor runs at the maximum speed.
• Adjust the input signal using parameters H6-03 through H6-05.
Check and correct parameter F1-01.
Check the setting for the overspeed detection level and the overspeed detection time (F1-08 and F1-09).
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
ov
For 200 V class: approximately 410 V
For 400 V class: approximately 820 V
• Install a DC reactor or an AC reactor.
• Voltage surge can result from a thyristor convertor and a phase advancing capacitor operating on the same drive input power
system.
• Check the motor power cable, relay terminals and motor terminal box for short circuits.
• Correct grounding shorts and turn the power back on.
• Review possible solutions for handling noise interference.
• Review section on handling noise interference and check control circuit lines, main circuit lines and ground wiring.
• If the magnetic contactor is identified as a source of noise, install a surge protector to the MC coil.
Set number of fault restarts (L5-01) to a value other than 0.
Reconnect the cable.
Correct the wiring.
Separate PG wiring from the source of the noise (often output wiring from the drive).
MEMOBUS/Modbus Comm. Test Mode Complete
This verifies that the test was successful.
Input Phase Loss
PF
Drive input power has an open phase or has a large imbalance of voltage between phases. Detected when L8-05 = 4 (enabled).
• Check for wiring errors in the main circuit drive input power.
• Correct the wiring.
• 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 Control Mode with PG)
Detected when no PG pulses are received for a time longer than setting in F1-14.
Reconnect the cable.
Correct the wiring.
Make sure the correct power supply is properly connected to the PG encoder.
Ensure the brake releases properly
PG Hardware Fault (detected when using a PG-X3 option card)
PG cable has become disconnected.
Reconnect the cable.
Motor Switch during Run
rUn
A command to switch motors was entered during run.
Change the operation pattern so that the motor switch command is entered while the drive is stopped.
6.5 Alarm Detection
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solution
Refer to Wire Gauges and Tightening Torque on page 54
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
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