SEW EURODRIVE MOVITRAC 31C series frequency converter

The operating manual for SEW EURODRIVE’s MOVITRAC 31C series frequency converter (July 2000 version) covers safety specifications, installation requirements (including EMC/UL compliance), start-up process (FBG31C keyboard/MC_SHELL software operation), operation and maintenance (troubleshooting, parameter configuration), and technical data. It is suitable for driving three-phase AC squirrel cage asynchronous motors, providing four sizes from 0-4 and two voltage specifications of 230V/400-500V. It supports three start-up modes: analog/fixed value/manual, and is equipped with multiple tabs such as FEA31C (IO extension) and FEN31C (speed detection). It clearly prohibits the use in explosion-proof areas and non fixed vibration scenarios, and must strictly follow the wiring specifications and Reduce capacity rules to ensure safe and stable operation.

Safety and Equipment Fundamentals

Security level and requirements

Specific requirements for safety types

Operation qualifications only allow trained professionals to install, start, and maintain

Electrical protection must be grounded and equipped with overcurrent protection devices (fuses). Even after a power outage, there may still be dangerous voltage within 10 minutes

Operation safety prohibits individual responsibility for personnel/equipment safety functions; Fault reset may cause the motor to restart, and the power supply needs to be disconnected in advance

The protection level of the whole machine is IP20 (EN 60529), and after removing the front cover, it is IP00. It needs to be kept closed during operation

Equipment identification and specifications

Model interpretation: Taking MOVITRAC 31C110-503-4-00 as an example, 110=11kW (recommended motor power), 50=380-500VAC, 3=three-phase, 4=4-quadrant (with brake chopper), 00=standard version

Size classification: There are a total of 5 sizes (0-4), corresponding to a power range of 0.55kW-45kW. Size 0 has no option slot, and 1-4 supports X20/X21 tab expansion

Standard accessories: power terminal, PE terminal, electronic terminal block, LED status indicator light (V1), S1 signal selection switch (10V/20mA)

Installation requirements

Mechanical installation parameters

Specific standards for required types

Tightening torque size 0:1.5 Nm; size 1:0.6 Nm; size 2:1.5 Nm; size 3/4:3.5 Nm

Installation spacing top/bottom ≥ 100mm, no lateral spacing requirement

The installation posture should only be vertical, and horizontal, inclined, or inverted installation is prohibited

Environmental conditions: Operating temperature 0-45 ℃ (rated load), capacity reduction of 3%/K at 45-60 ℃; Storage temperature -25-70 ℃

Electrical Installation Specification

Cable requirements:

Power cable: Select according to the rated input current, and when the PE conductor cross-section is ≥ 10mm ², it should have the same cross-section as the power line

Motor cable: selected according to the rated output current, with a maximum length of 100m, shielded twisted pair cable, and shielded layer grounded at both ends

Encoder cable: Core wire cross-sectional area of 0.2-0.5mm ², maximum length of 100m, routed in separate slots with power cables

Grounding requirements: The casing of the frequency converter should be in metal contact with the installation plate of the switchgear, and the PE conductor should be reliably grounded

EMC protection:

Input side: Configure NF series input filter, installed at a distance of ≤ 400mm from the frequency converter

Output side: Equipped with HD series output reactors, only U/V/W three-phase pass through the reactors, PE conductors do not pass through

UL Compliance Requirements

Specific standards for compliance items

The wire material only uses copper wire, with a temperature rating of 60/75 ℃ or 75 ℃ (depending on the model power)

Fuse selection: 230V model, maximum 63-110A/600V; 400-500V model, maximum 16-400A/600V

The power supply system is only applicable to TN/TT systems, and the IT system does not have UL certification

External 24V power supply voltage ≤ 30VDC, current ≤ 8A

Tab and Interface Configuration

Core tab functionality

Tab Model Function Installation Slot Key Parameters

FEA31C Analog/Digital IO Expansion X20 2-channel Analog Input, 2-channel Analog Output, 4-channel Binary Input

FIO31C digital IO expansion X20 with 7 binary inputs and 6 binary outputs

FEN31C speed detection X21 supports incremental encoders with a maximum pulse frequency of 200kHz

FPI31C position detection X21 supports SSI absolute encoder, 128-2048 pulses/rev

FIT31C motor temperature detection (TF/TH) X21 binary output indicates motor temperature status, triggering emergency stop when overheating occurs

USS21A serial interface extension X4 supports RS-232 (up to 5m), RS-485 (up to 200m, 32 nodes)

Interface technical data

RS-232 interface: baud rate 9600baud, 8 data bits+1 stop bit, no checksum, 9-pin D-type connector

RS-485 interface: baud rate 9600baud, half duplex asynchronous, 4-core shielded cable, integrated terminal resistor

Start the process

Starting premise

Complete installation inspection, disconnect electronic terminal block X3 to prevent accidental motor start-up

Choose the startup tool: FBG31C keyboard (direct operation) or MC_SHELL software (PC connection)

Core startup steps (FBG31C keyboard)

Step operation content

Connect the keyboard to the X4 slot, and the LED V1 will turn yellow (ready state) when powered on

Select language (German/English/French) and set it through P850 parameters

3. Basic configuration parameters: P200 (minimum frequency 5Hz), P201 (reference frequency, according to the motor nameplate), P202 (maximum frequency)

4. Activate the frequency converter: X3:43 (enable/emergency stop) connected to the “1” signal

5. Starting motor: X2:41 (forward rotation) or X3:42 (reverse rotation) connected to the “1” signal, the motor starts at the P200 set frequency

6 Optimization Parameters: Adjust Slope Time (P120/P121), BOOST (P321), I × R (P322), etc

Motor starting method

Key operating points for applicable scenarios of startup mode

Analog continuous speed regulation is given by inputting 0-10V or 4-20mA signals through X2:34 terminals

Fixed set value multi speed control selects P160-P162 (n11/n12/n13) preset frequency through binary input combination

Enable P870 (manual operation) in the manual operation debugging scenario, and adjust the speed (150rpm/s) through the ￪/￬ keys on the keyboard

Operation and maintenance

Operation display

LED indicator status:

Meaning of LED color status

Yellow ready (mains power supply is normal)

Green rotating magnetic field activation (motor operation)

Red fault alarm

Yellow flash self-test/factory reset/undervoltage

Red yellow flashing limit switch activated

FBG31C keyboard: supports parameter copying, fault viewing, manual operation, provides short menu (common parameters) and full menu (full parameters)

Fault handling

Fault storage: P060-P064 records the last 5 faults, including data on DC bus voltage, heat sink temperature, current, etc. at the time of the fault

Reset method: Power off restart (required ≥ 10 seconds), terminal reset (programming binary input is “reset” function), keyboard E key reset, software reset

Common faults and solutions:

Fault code description and troubleshooting measures

1. Overcurrent check for output short circuit, motor overload, and output stage fault

2 DC bus overvoltage extension deceleration ramp, check the brake resistor wiring

6. Overheating improves heat dissipation, reduces load, and checks the fan

10. Incorrect rotation direction. Switching motor two-phase wiring

50 limit switch missing check limit switch wiring, short circuit if not in use

Core parameter configuration

Motor parameters: P320 (maximum current 150% rated value), P324 (pole pairs, 4-pole motor set to 2), P329 (motor voltage)

Control parameters: P120 (ramp rise time 1-2000s), P201 (reference frequency 50/60Hz), P770 (operating mode: V/f/speed control)

Protection parameters: P510 (speed monitoring), P541 (motor protection: alarm/stop)

Technical data (core specifications)

Core parameters of 230V model (example)

Model size, rated output power, rated output current, minimum resistance of braking resistor

005-233 0 1.3kVA 3.2AAC 68Ω

022-233 1 3.4kVA 8.6AAC 33Ω

075-233 3 11.6kVA 29AAC 11Ω

Core parameters of 400-500V models (example)

Model size, rated output power, rated output current, minimum resistance of braking resistor

011-503 0 2.2kVA 3.2AAC 200Ω

055-503 2 8.3kVA 12AAC 47Ω

220-503 3 33kVA 47AAC 15Ω

electronic data

Analog input: 9-bit resolution (voltage)/8-bit resolution (current), sampling time 5ms

Binary input: Optocoupler isolation, 13-30V=1, -3-5V=0, sampling time 5ms

PWM frequency: 4/8/12/16kHz adjustable (P325)

Auxiliary power output: 24VDC, maximum 250mA