OMRON MX2 frequency converter debugging

E09 Under voltage input voltage too low, instantaneous power outage check power supply, enable instantaneous power outage and restart (b001~b005)

E12 external trip EXT terminal input valid check external signal

E13 USP Error: When powered on, the running command exists and the USP function is enabled. First, disconnect the running command and then reset it

E14 grounding fault output side short circuit to ground inspection motor and cable insulation resistance

E21 frequency converter overheating heat sink temperature exceeds threshold, fan failure or blockage. Clean the heat sink and check the cooling fan

E30 drive error IGBT instantaneous overcurrent power outage, check if the output is short circuited, restart is ineffective and needs to be reported for repair

E35 thermistor tripped, motor temperature is too high, PTC input exceeds limit, check motor cooling, confirm PTC wiring is correct

E41 Modbus communication error communication timeout or CRC error check wiring, baud rate, station number, C076 set to 02 can be ignored

E80 encoder disconnection PG feedback signal loss check encoder wiring and power supply

After the fault occurs, the last 6 fault records (including frequency, current, voltage, and operating time at the time of the fault) can be viewed through d081~d086. To clear the fault, press the Stop/Reset button or reset it through terminal RS.

Intelligent input/output terminal configuration

7.1 Allocation of Input Terminal Functions (C001~C007)

Each terminal can be assigned a functional code. Common code:

00: FW (running forward)

01: RV (reverse operation)

02~05: CF1~CF4 (multi-stage speed selection)

06: JG (Jogging)

07: DB (External DC Braking)

11: FRS (Free Parking)

12: EXT (External Fault)

13: USP (Activate Protection)

15: SFT (Soft Lock)

16: AT (Analog Voltage/Current Selection)

18: RS (Reset)

23: PID (PID disabled)

27/28: UP/DWN (remote frequency adjustment)

Corresponding to each input, NO/NC can also be set (C011~C017, 00 is normally open, 01 is normally closed).

7.2 Function allocation of output terminals (C021, C022, C026)

00: RUN (Running)

01: FA1 (frequency arrival)

02: FA2 (exceeding the set frequency)

03: OL (Overload Warning)

05: AL (alarm output, default relay)

07: OTQ (over torque)

10: TRQ (in torque limit)

11: RNT (Run Time Up)

12: ONT (power on time up)

13: THM (Thermal Warning)

19: BRK (Brake Release)

20: BER (Brake Failure)

21: ZS (zero speed detection)

22: DSE (excessive speed deviation)

23: POK (positioning completed)

The output delay time can be set to ON/OFF delay (0-100 seconds) through C130~C141.

Modbus communication configuration

MX2 supports Modbus RTU protocol through RS485, which can complete the start stop, frequency setting, and status reading of the frequency converter.

8.1 Communication parameter settings

Parameter Name Recommended Value Description

C071 baud rate 05 (9600bps) or 06 (19200bps) needs to be consistent with the main station

C072 station numbers 1-247 are unique for each station

C074 Parity Check 00 No Check/01 Even/02 Odd Main Station Corresponding

C075 Stop bit 01 (1 bit) or 02 (2 bits)

C076 communication error action 02 (ignored), 00 (tripped) are generally set to 02 to avoid tripping

C077 communication timeout 0.00 (disabled) or 0.1-99.99 seconds

8.2 Register Address

Control coil (function code 01/05/0F):

0001H: Run Command (1=Run)

0002H: Direction (1=Reverse)

0003H: External trip

0004H: Reset

Keep register (function code 03/06/10):

0001H (high and low bytes): Output frequency setting (F001), unit 0.01Hz

1103H~1104H: Acceleration time 1 (F002), unit 0.01 seconds

1201H: Frequency source selection (A001)

When using Modbus to write registers, if permanent saving is required, write 1 (ENTER command) to 0900H, otherwise restore the original value after power failure. Note that the write life of EEPROM is limited, and unnecessary save operations should be reduced.

Safety Stop Function (STO)

The MX2 meets the safety levels of ISO 13849-1 PLd and IEC 61508 SIL2, and provides a 'Safe Torque Off' function. By disconnecting the two safety input channels GS1 and GS2, the output transistor drive can be cut off within 200ms, achieving the stop category 0 specified in EN60204-1.

9.1 Wiring Requirements

Connect the output of safety relays (such as G9SX, NE1A) to terminals 3 (GS1) and 4 (GS2), and connect the common terminal to L (short-circuit PLC-L for source logic).

Terminal 11 can be configured as an EDM (External Device Monitoring) output to provide feedback on the contact status of the safety relay.

GS1 and GS2 must be disconnected simultaneously to reliably shut down; If only one channel is disconnected, the frequency converter will still stop outputting, but EDM will not be activated, indicating a wiring fault.

It is recommended to use shielded twisted pair cables for secure input cables, with a length not exceeding 30m.

9.2 Parameter Settings

Set C003 and C004 to 77 (GS1) and 78 (GS2), respectively, and set C013/C014 to 01 (normally closed, as the safety relay's normally closed contact output).

Set b145 to 01 (trip when safety input is disconnected, display E37).

Set C021 to 62 (EDM) and C031 to 00 (normally open).

9.3 Attention

STO does not cut off the main circuit power supply, so during maintenance, it is still necessary to disconnect the power supply and implement locking/tagging procedures.