Servo drive external wiring diagram_Servo drive failure and repair

How to connect the servo drive

There are two connections that can be made.

One is the power line, that is, the driver supplies three-phase AC power to the motor, usually with three or four wires;

The second is the encoder signal line, and the position signal is fed back by the encoder to the driver for calculation.

Generally speaking:

Nowadays, most servos are AC servos, so their power cords are no different from those of ordinary three-phase asynchronous motors.

The power cord is connected from the servo drive power module to the motor power port

The encoder is connected from the servo encoder port to the motor encoder port. Depending on the encoder signal, some intermediate conversion devices may need to be installed.

Servo drive external wiring diagram

Note: 1. SRV-CTRL refers to the servo control module of PLC;

2. The one pointed to by → is the input, and the one pointed to by ← is the output.

3. The meanings of each signal are as follows:

INH: prohibit input pulse command (prohibited when open circuit);

OZ-: Z phase output;

OZ+: Z phase output;

S-RDY: The servo drive is ready;

ALM: Servo drive fault alarm;

COIN: Positioning completed;

SRV-ON: Servo drive "on" signal;

COM-: negative pole of power supply;

COM+: positive pole of power supply;

PULS1: command pulse input terminal;

PULS2: command pulse input terminal;

SIGN1: command pulse sign input terminal;

SIGN2: command pulse sign input terminal;

Servo Drive Wiring Guide

In the field of industrial automation, many devices have strict installation specifications. So in order to avoid risks in use and eliminate safety hazards, what are the rules for connecting servo drives?

1. It is recommended to use a three-phase isolation transformer to supply power to reduce the possibility of electric shock.

2. It is recommended that the power supply be powered by a noise filter to improve anti-interference capabilities.

3. Please install a non-fuse short-circuit breaker to cut off the external power supply in time when the drive fails.

4. The grounding wire should be ≥2.5m2, as thick as possible, and made into a single-point grounding. The grounding terminal of the servo motor must be connected to the grounding terminal PE of the driver.

5. Connect the cable shield correctly.

6. To prevent erroneous operation caused by interference, it is recommended to install a noise filter and pay attention to:

(1) The noise filter, servo drive and upper controller should be installed as close as possible.

(2) Surge suppressors must be installed in relays, AC contactors, brakes and other coils.

(3) Power circuit cables and signal lines should not be tied together.

Servo drive failure and repair

The servo drive is a controller used with a servo motor to control the servo motor. It is part of the servo system and plays a very important role in the industrial field. Therefore, after purchasing a servo drive, customers must know some common faults and treatment methods so that they can quickly deal with similar problems. Today, the editor of Huantong Electromechanical will share with you the maintenance methods of the servo drive.

(1) After power is turned on, the LED of the servo driver does not light up

Cause of failure: The voltage may be too low

Solution: Increase the voltage

(2) The LED light is on, but the servo motor does not rotate

Cause of the fault: The command signal is not to the driver signal ground

Solution: Connect the command signal ground to the driver signal ground

(3) The LED light remains red

Cause of failure: There is a fault

Solution: Check whether the machine has problems such as overvoltage, overheating, short circuit, etc.

(4) When the servo motor rotates, the LED light flashes continuously

Cause of failure: Hall phase setting error

Solution: Check whether the motor phase switch setting is correct.

Here is a brief summary of several common servo drive failures and their solutions. Have you learned them? You can easily handle similar problems in the future.