OMRON SYSDRIVE 3G3MV Multi-functional Compact Frequency Inverter In-depth Technical Guide

REd: Read the parameters of the frequency converter to the operator.

Cpy: Copy the parameters from the operator to the frequency converter.

VFy: Verify whether the parameters of the operator and the frequency converter are consistent.

VA: Display the capacity of the frequency converter.

Sno: Display software number.

N177 (parameter reading prohibited selection): When set to 0, reading parameters from the frequency converter is prohibited (protecting operator data); When set to 1, reading is allowed.

Copy restriction: The manual clearly states that parameters between different voltage levels (such as 200V and 400V) cannot be copied. When copying between different capacities, parameters such as n011-n017, n036, n080 will not be copied.

Part Four: Maintenance and Fault Diagnosis

4.1 Maintenance Operations

Cooling fan replacement: The manual provides detailed replacement steps for cooling fans of 68mm, 108mm, 140mm, 170mm, and 180mm wide models, including removing the fan cover, disconnecting the connector, installing a new fan, and ensuring the correct wind direction.

Long term storage and handling: Electrolytic capacitors are used inside the frequency converter, and long-term storage may lead to a decrease in capacitor performance. The manual suggests that if the product has not been used for a long time, please contact a sales representative for consultation and handling.

4.2 Fault detection and handling

The faults of 3G3MV are divided into two categories: fatal errors and non fatal errors (warnings).

Fatal error: When a fault occurs, the fault code is displayed on the operator, the fault contact outputs action, the inverter output is turned off, and the motor stops freely.

OC (Overcurrent): The output current of the frequency converter reaches or exceeds 250% of the rated current. The reasons may be short circuit on the output side, improper V/f setting, excessive motor capacity, and opening and closing of the electromagnetic contactor on the output side.

OV (Overvoltage): The DC voltage of the main circuit exceeds the detection level (410V DC for 200V level). The reasons may be excessive regenerative energy (not connected to the braking resistor), high power supply voltage, damaged braking transistor, etc.

UV1 (main circuit undervoltage): The DC voltage of the main circuit is lower than the detection level. The reasons may be power phase loss, improper power supply voltage, instantaneous power outage, etc.

OH (overheating of heat sink): The temperature of the heat sink reaches 110 ° C ± 10 ° C. The reasons may be high ambient temperature, excessive load, blocked ventilation, cooling fan failure, etc.

OL1 (motor overload): The electronic thermal relay is activated. The reasons may be excessive load, improper V/f setting, short acceleration and deceleration time, incorrect rated motor current setting, etc.

OL2 (frequency converter overload): The electronic thermal relay is activated. The reasons may be excessive load, improper V/f settings, insufficient capacity of the frequency converter, etc.

Warning (non fatal error): The warning does not affect the output of the faulty contact, and the frequency converter will automatically recover after the cause is eliminated. The display code will flash.

Uu (main circuit undervoltage): Same as UV1 but only as a warning.

OU (main circuit overvoltage): Similar to OV but only serves as a warning.

CAL (Communication Standby): RS-422/485 communication not established properly. Possible reasons include broken communication lines, incorrect terminal resistance settings, and errors in the main station program.

OP1-OP5 (operation error): Parameter settings are incorrect, such as duplicate functions of the multifunctional input terminal, failure to meet V/f mode conditions, and incorrect frequency upper and lower limit settings.

EF (Forward and Reverse Simultaneous Input): The forward and reverse instructions are input simultaneously for more than 0.5 seconds.

STP (Emergency Stop): An emergency stop signal is input through the multifunctional input terminal, or stopped by pressing the STOP button on the operator.

4.3 Reset method

Fault reset can be performed in one of the following three ways:

Set the fault reset signal (multifunctional input terminal set to 5) to ON.

Press the STOP/RESET button on the numeric operator.

Turn off the main circuit power and then turn it back on.

However, it should be noted that if the running instruction is being inputted, the reset signal will be ignored. Therefore, a reset must be performed with the running instruction turned off.