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Omron OMNUC G5 Series - User Manual

Omron OMNUC G5 Series
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Cat. No. I573-E1-03
USER’S MANUAL
OMNUC G5 SERIES
R88M-K@
(AC Servomotors)
R88D-KN@-ECT-R
(AC Servo Drives)
AC SERVOMOTORS/SERVO DRIVES
WITH BUILT-IN EtherCAT COMMUNICATIONS

Table of Contents

Questions and Answers

  • T
    Tara CollierNov 24, 2025
    Why Omron OMNUC G5 Servo Drives show Main Circuit Power Supply Undervoltage (PN)?
    • M
      Mackenzie WalkerNov 24, 2025
      Omron Servo Drives may display a Main Circuit Power Supply Undervoltage error (PN) due to several reasons. If the Undervoltage Error Selection is set to 1, a momentary power interruption between L1 and L3 might have exceeded the specified Momentary Hold Time. Other causes include low power supply voltage, insufficient power supply capacity due to inrush current, phase-failure in 3-phase input models operated with single-phase power, or a faulty Servo Drive. To resolve this, measure the voltage between the connector (L1, L2, and L3) lines. Increase the power supply voltage or change the power supply. Check the Momentary Hold Time setting. Ensure each phase of the power supply is correctly connected, using L1 and L3 for single-phase 100 V and 200 V. Increase the power supply capacity. If the...
  • A
    Amanda WilsonAug 27, 2025
    How to fix Error Counter Overflow in Omron OMNUC G5 Servo Drives?
    • C
      Craig HunterAug 27, 2025
      To fix an Error Counter Overflow in Omron Servo Drives, the issue arises when position error pulses exceed the Following error window setting. This can occur if motor operation doesn't follow the command or if the Following error window value is too small. Begin by checking if the Servomotor rotates according to the position command pulse. Examine the torque monitor for saturated output torque and adjust the gain accordingly. Maximize the set values on the Positive and Negative torque limit values. Ensure the encoder is wired correctly. Lengthen the acceleration and deceleration times, and reduce the load and speed. If necessary, increase the set value of object 6065 hex.
  • C
    Charles CooleyAug 28, 2025
    Why Omron Servo Drives show Regeneration Overload?
    • G
      gjonesAug 29, 2025
      Omron Servo Drives may show a Regeneration Overload if the regenerative energy exceeds the processing capacity of the Regeneration Resistor. This can occur due to high regenerative energy during deceleration from a large load inertia, high Servomotor rotation speed, or the external resistor's operating limit being restricted to a 10% duty. Check the load rate of the Regeneration Resistor through communications. Increase the capacities of the Servo Drive and the Servomotor, and lengthen the deceleration time. Use an External Regeneration Resistor. Set the Regeneration Resistor Selection to 2.
  • A
    Angela ReeseAug 30, 2025
    Why Omron OMNUC G5 show Servo Drive Overheat?
    • C
      cynthia10Aug 30, 2025
      Omron Servo Drives may overheat if the temperature of the Servo Drive radiator or power elements exceeds the specified value. This can be caused by a high ambient temperature around the Servo Drive or an overload condition. To resolve this, improve the ambient temperature and cooling conditions of the Servo Drive. Additionally, consider increasing the capacities of the Servo Drive and the Servomotor, setting longer acceleration and deceleration times, and reducing the load.
  • J
    Jerry HullAug 31, 2025
    Why Omron OMNUC G5 Servo Drives show Encoder Communications Error?
    • D
      Dawn StrongAug 31, 2025
      Omron Servo Drives may display an Encoder Communications Error due to a data error, primarily caused by noise. This can occur even if the encoder cable is connected. To address this, ensure the encoder power supply voltage is within the required 5 VDC ±5% range, especially if the encoder cable is long. Separate the Servomotor cable and the encoder cable if they are bundled together. Connect the shield to FG.
  • C
    Charles GreenSep 23, 2025
    What causes encoder communication disconnection error in Omron Servo Drives?
    • M
      Michael HernandezSep 23, 2025
      If you encounter an encoder communications disconnection error with Omron Servo Drives, it means a disconnection was detected because communications between the encoder and the Servo Drive were stopped more frequently than the specified value. To resolve this, wire the encoder correctly as shown in the wiring diagram and correct the connector pin connections.
  • C
    Christopher YorkSep 18, 2025
    How to fix encoder communication error in Omron Servo Drives?
    • G
      gabrielwheelerSep 18, 2025
      If you're experiencing an encoder communications error with your Omron Servo Drives, it's likely due to noise affecting the data from the encoder. To fix this, provide the required encoder power supply voltage 5 VDC ±5% (4.75 to 5.25 V), paying special attention when the encoder cable is long. If the Servomotor cable and the encoder cable are bundled together, separate them. Also, connect the shield to FG.
  • M
    Melinda GreenSep 18, 2025
    What does excessive hybrid deviation error mean for Omron OMNUC G5?
    • J
      Jerry BenderSep 19, 2025
      If you're getting an excessive hybrid deviation error on your Omron Servo Drives, it means that during fully-closed control, the difference between the load position from the external encoder and the Servomotor position from the encoder was larger than the number of pulses set as the Hybrid Following Error Counter Overflow Level (3328 hex). Check the Servomotor and load connection. Check the external encoder and Servo Drive connection. When moving the load, check to see if the change in the Servomotor position (encoder feedback value) has the same sign as the change in the load position (external encoder feedback value).
  • A
    amorrisSep 9, 2025
    What to do if Omron Servo Drives are overloaded?
    • V
      Victor MooreSep 9, 2025
      If you're encountering an overload with your Omron Servo Drives, it means the feedback value for torque command exceeds the overload level specified in the Overload Detection Level Setting (3512 hex). Check if torque (current) waveforms oscillate or excessively oscillate vertically during analog output or communications. Review the overload warning display and the load rate through communications. You can increase the capacities of the Servo Drive and the Servomotor, set longer acceleration and deceleration times, and reduce the load. Alternatively, try readjusting the gain.
  • E
    Elizabeth WardSep 7, 2025
    What causes Overspeed in Omron OMNUC G5?
    • J
      Justin BatesSep 7, 2025
      Overspeed in Omron Servo Drives occurs when the Servomotor rotation speed exceeds the value set on the Overspeed Detection Level Setting. This can be due to excessive speed commands, incorrect input frequency, dividing ratio, or multiplication ratio of the command pulse. If overshooting occurs due to faulty gain adjustment, adjust the gain. Ensure the encoder is wired correctly.

Omron OMNUC G5 Series Specifications

General IconGeneral
ModelOMNUC G5 Series
CategoryServo Drives
CommunicationEtherCAT, MECHATROLINK-III
SafetySTO (Safe Torque Off)
Protection FunctionsOvercurrent, Overvoltage, Undervoltage, Encoder Error
Ambient Operating Temperature0°C to 55°C
Ambient Storage Temperature-20°C to 65°C
Shock Resistance98 m/s2
Cooling MethodNatural Cooling
Ambient Humidity90% RH or less (non-condensing)

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