Omron J1000 User Manual page 129

Motor hunting occurs.
LED Operator Display
Cause
There is phase loss in the drive input power.
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.
LED Operator Display
Cause
Deceleration time is too short and excessive
regenerative energy is flowing back into the
drive.
Excessive braking inertia.
The proper braking resistor has not been
installed.
LED Operator Display
Cause
Input power phase loss.
One of the drive input power wiring terminals
is loose.
There is a problem with the voltage from the
drive input power.
The power has been interrupted.
Drive internal circuitry has become worn.
The drive input power transformer is not large
enough and voltage drops after switching on
power.
Air inside the drive is too hot.
Problem with the CHARGE indicator.
LED Operator Display
SIEP C710606 33A OYMC AC Drive – J1000 User Manual
• Adjust the parameters that control hunting.
• Set the hunting prevention gain (n1-02).
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 (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 specified in this manual to fasten the terminals.
and Tightening Torque on page 37
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive input power.
• Disable Input Phase Loss Detection (L8-05 = "0"). PF is detected if DC bus ripple is too high. If it
is disabled, there is no fault but the ripple is still too high, thereby the capacitors are stressed more
and lose lifetime.
• Stabilize drive input power or disable phase loss detection.
• Check the maintenance time for the capacitors (U4-05).
• Replace the drive if U4-05 is greater than 90%.
• Check for anything wrong with the drive input power.
• If nothing is wrong with the drive input power, try the following solutions if the alarm continues:
• Disable Input Phase Loss Protection selection (L8-05 = "0"). PF is detected if DC bus ripple is too
high. If it is disabled, there is no fault but the ripple is still too high, thereby the capacitors are stressed
more and lose lifetime.
• Replace the drive.
Braking Resistor Overheat
Braking resistor protection was triggered.
Fault detection is enabled when L8-01 = 1 (disabled as a default).
rH
Note: The magnitude of the braking load trips the braking resistor overheat alarm, NOT the surface
temperature. Using the braking resistor more frequently than its rating trips the alarm even when the
braking resistor surface is not very hot.
• Check the load, deceleration time and speed.
• Reduce the load.
• Increase the acceleration and deceleration times (C1-01 through C1-04).
• Replace the braking option with a larger device that can handle the power that is discharged.
Recalculate braking load and braking power. Then try reducing the braking load and checking the
braking resistor settings and improve braking capacity.
• Check the specifications and conditions for the braking resistor device.
• Select the optimal braking resistor.
DC Bus Undervoltage
One of the following conditions occurred while the drive was stopped:
• Voltage in the DC bus fell below the undervoltage detection level.
Uv1
• For 200 V class: approximately 190 V (160 V for single phase drives)
• For 400 V class: approximately 380 V (350 V when E1-01 is less than 400) The fault is output only
if L2-01 = 0 or the DC bus voltage is below the Uv detection level for a certain time while L2-01 =
1.
• The main circuit drive input power is wired incorrectly.
• Correct the wiring.
• Ensure there are no loose terminals.
• Apply the tightening torque specified in this manual to fasten the terminals.
and Tightening Torque on page 37
• Check the voltage.
• Correct the voltage to within range listed in drive input power specifications.
Correct the drive input power.
• Check the maintenance time for the capacitors (U4-05).
• Replace the drive if U4-05 exceeds 90%.
Check the capacity of the drive input power transformer.
Check the drive internal temperature.
Replace the drive.
Undervoltage 3 (Inrush Prevention Circuit Fault)
Uv3
The inrush prevention circuit has failed.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
6.4 Fault Detection
Refer to Wire Gauges
Refer to Wire Gauges
6
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