SEW MOVIDRIVE MD60A Inverter Guide

3.1 System Bus (SBus) Connection

SBus is based on the CAN bus standard (ISO 11898) and supports up to 64 sites.

Cable specifications: Twisted shielded copper cable must be used, with a characteristic impedance of 120 Ω (at 1MHz) and a capacitance of ≤ 40 pF per meter.

Terminal resistor: The terminal resistor needs to be activated (set to ON) on the devices connected at the beginning and end of the SBus connection through dip switch S12, and S12 at the intermediate station must be turned off (OFF).

Baud rate and distance: up to 320 meters at 125 kbaud; The limit is 40 meters at 1000 kbaud.

Potential balance: Devices connected through SBus must ensure that there is no potential difference between them, otherwise additional grounding wires need to be used for compensation.

3.2 RS-485 interface

The RS-485 interface supports multi-point connections (up to 32 devices) and is commonly used for master-slave control.

Dynamic terminal resistor: This interface has a built-in dynamic terminal resistor, which does not require additional external connections.

Maximum length: The total length of the line is limited to 200 meters. It is also necessary to connect the shielding layer to DGND over a large area.

3.3 Connection between Encoder and Rotary Transformer

Section 4.13 of the manual provides detailed wiring requirements for feedback systems, which are crucial for closed-loop control.

Line length and diameter: The maximum length from the inverter to the encoder/rotary transformer is 100 meters, and the cross-sectional area of the core wire should be between 0.20-0.50 mm ².

High resolution Sin/Cos encoder: ES1S, ES2S, or EV1S are recommended. This type of encoder is powered by 24V DC and does not require a separate sensing cable. Attention should be paid when wiring: Cut the purple wire (VT) at the motor end.

HTL sensor: For 24V HTL sensors (such as ES1C), be careful not to connect the reverse channels A (K1), B (K2), and C (K0).

Resolver: For the MDS60A model, a rotary transformer needs to be connected. The typical color codes are: Ref.+pink, Cos+red, Sin+yellow.

Start debugging and parameter configuration

The Startup section provides a detailed distinction between two debugging tools: DBG11A keyboard (for VFC mode) and PC software MOVITOOLS (for CFC/SERVO mode).

4.1 Preparation before startup

Security lock: It is necessary to ensure that the X13:1 (DIO0 "Controller inhibit") terminal is a "0" signal (low level) to prevent accidental motor start-up.

Data collection: Prepare motor nameplate data (rated voltage, current, frequency, power factor cos φ), encoder type (TTL/Sin Cos/HTL), and load moment of inertia.

4.2 Using DBG11A for VFC startup

For standard VFC control (sensorless vector control), the operation process is as follows:

Language setting: In parameter group 8, modify P801 to select the language (DE/EN/FR).

Parameter set and mode: Select the parameter set (such as Param. Set 1) and the running mode (such as VFC1).

Motor parameterization:

If it is an SEW standard 4-pole motor, you can directly select the model from the list (such as DV112M4).

If it is a non SEW motor, manual input of nameplate data is required. Special attention: If using Δ connection and the turning point is 87 Hz, the rated voltage of 230V must be input first, and then the maximum speed of P302 should be modified to the corresponding value of 87 Hz after starting.

Static recognition: For non SEW motors, the system will prompt for calibration. At this point, a brief X13:1 "1" signal is required to excite the motor for parameter estimation. Save the data to EEPROM after completion.

4.3 Starting of speed controller (closed-loop)

If the application requires precise speed control (VFC-n-CTRL, CFC, or SERVO), it must enter the speed controller startup menu after completing basic startup.

Parameter input: Motor brake type, load inertia (unit: 10 ^ -4 kgm ²), and rigidity coefficient need to be entered.

Encoder monitoring: After debugging, it is recommended to activate the encoder monitoring function (P504="ON") to monitor the encoder voltage and signal integrity.

4.4 Manual mode operation

DBG11A supports manual mode for testing. After entering manual mode, the 7-segment code displays "H". At this point, all other digital input functions except for the "controller disable" terminal are disabled. You can control the forward and reverse rotation through the directional keys on the keyboard, and adjust the speed through the up and down keys.

Technical data analysis and selection

Chapter 7 of the manual provides detailed technical data, which is an important basis for selection calculations. The following key parameters are excerpted for interpretation:

5.1 Typical parameters of 400/500V unit (size 1)

Taking MD_60A0015-5A3 as an example:

Input: 3 × 380-500 VAC, rated input current 3.6 AAC (at 100% load).

Output: Rated power of 2.8 kVA, output current of 4.0 AAC.

Overload capacity: The maximum current limit can reach 150% of the rated current, but the duration is limited by the device's internal Ixt calculation (unit utilization rate).

Braking: The minimum allowable braking resistance is 68 Ω. The manual suggests matching the braking resistor according to the model, such as BW100-005 (trip current 0.8 A).