Festo SEC-ST-48-6-P01 Bedienungs- und Montageanleitung

Description

8046712

en 1507d

[8046714]

Motor controller

SEC-ST-48-6-P01

Designation SEC-ST-48-6-P01-EN.....................

Edition en 1507d..................................

Original de.......................................

Part no. [8046714].................................

EFesto AG & Co.KG, D‐73726 Esslingen,

Federal Republic of Germany

Internet: http://www.festo.com

E-Mail: service_international@festo.com

The reproduction, distribution and utilization of this docu

ment as well as the communicaton of its contents to others

without express authorization is prohibited. Offenders will be

the event of the grant of a patent, utility module or design.

Contents and general instructions

III

Festo SEC-ST-48-6-P01-EN en 1507d English

Contents

Designated use VI........................................................

Target group VII..........................................................

Service VII...............................................................

Notes on the use of this manual VII...........................................

General information on stepping motor systems VIII.............................

Procedure for correctly adjusting the stepping motor XIII.........................

Important user instructions XVI..............................................

Trademarks XVIII...........................................................

Safety instructions XVIII.....................................................

1. System summary 1-1...............................................

1.1 Overview 1-3......................................................

1.2 Performance characteristics 1-3......................................

1.3 Controller part 1-4.................................................

1.3.1 Brief description 1-4........................................

1.4 Final output stage 1-4..............................................

1.4.1 Brief description 1-4........................................

1.4.2 Internal monitoring 1-4......................................

1.5 Displays 1-5......................................................

1.5.1 Ready-to-operate display 1-5.................................

1.5.2 Fault display 1-5............................................

1.6 User interfaces 1-6.................................................

1.6.1 Enable input 1-6............................................

1.6.2 Direction input 1-7..........................................

1.6.3 Clock input 1-8.............................................

1.6.4 Fault output 1-9............................................

1.7 Settings 1-10.......................................................

1.7.1 The step mode 1-10..........................................

1.7.2 The current setting 1-12......................................

1.7.3 The current reduction I-red 1-13................................

1.7.4 Enable switch 1-13...........................................

1.7.5 The buttons 1-14............................................

Contents and general instructions

IV Festo SEC-ST-48-6-P01-EN en 1507d English

2. Fitting 2-1........................................................

2.1 Dimensions 2-3....................................................

2.2 Current supply 2-5.................................................

2.3 Electromechanics: front view 2-6......................................

3. Installation 3-1...................................................

3.1 Material 3-3.......................................................

3.1.1 Manufacturer 3-3...........................................

3.1.2 Plug X1 for control cable 3-4..................................

3.1.3 Plug X2 for stepper motor connection 3-4.......................

3.1.4 Plug X3 for power supply 3-4.................................

3.1.5 PE connection of the SEC-ST 3-4...............................

3.2 Plug connectors and their pin assignments 3-5..........................

3.2.1 X1 plug for control cable KSPC-SECST-1.5 3-5...................

3.2.2 Motor cable and current supply for the SEC-ST 3-6................

3.3 Connecting the cables 3-7...........................................

3.3.1 Overview of connections 3-8..................................

3.3.2 SEC-ST complete system 3-9..................................

3.3.3 Connecting the motor to the SEC-ST 3-9........................

3.3.4 Connecting the SEC-ST to the power supply 3-10..................

3.3.5 Connecting the SEC-ST to the controller 3-10.....................

3.4 PE protective conductor and screening connections 3-11...................

3.4.1 Connection instructions 3-11..................................

3.4.2 Electrical isolation 3-11.......................................

3.5 Measures for complying with EMC guidelines 3-12........................

4. Commissioning 4-1................................................

4.1 Commissioning the SEC-ST 4-3.......................................

5. Diagnosis and error treatment 5-1....................................

5.1 Fault messages of the SEC-ST 5-3.....................................

5.2 Fault functions of the SEC-ST 5-4......................................

Contents and general instructions

Festo SEC-ST-48-6-P01-EN en 1507d English

A. Technical appendix A-1.............................................

A.1 Technical specifications A-3..........................................

A.1.1 SEC-ST-48-6-P01 A-3........................................

A.1.2 Maximum ratings A-4........................................

Contents and general instructions

VI Festo SEC-ST-48-6-P01-EN en 1507d English

Designated use

The SEC-ST-48-6-P01, referred to here as the SEC-ST, Smart

Electromotor Controller Stepper motor, has been designed for

use in control cabinets for controlling stepper motors in

2-string technology.

The SEC-ST must be operated in a safe working environment.

An EMERGENCY STOP circuit must be installed for the sys

tem.

Operate the SEC-ST only under the permitted ambient condi

tions.

The SEC-ST may only be operated in a stationary industrial or

commercial system. The electromagnetic resistance to inter

ference of the power electronics is not designed for operation

in mobile systems, in households or in firms which are con

nected directly to the low voltage network.

Install the SEC-ST screened and earthed in a control cabinet.

Otherwise, the electromagnetic compatibility (EMC) of the

power electronics cannot be guaranteed.

The SEC-ST may only be used as follows:

– in accordance with designated use

– in its original state

– without any modifications by the user

– in faultless technical condition.

If additional commercially-available components such as sen

sors and actuators are connected, the specifiedlimits for pres

sures, temperatures, electrical data, torques, etc. must not

be exceeded.

Please observe the standards specified in the relevant

chapters and comply with technical regulations, as well as

with national and local regulations.

Contents and general instructions

VII

Festo SEC-ST-48-6-P01-EN en 1507d English

Target group

This manual is directed exclusively at technicians trained in

control and automation technology,

who are dealing for the first time with stepper motor con

trollers

or who already have experience of stepper motors.

Service

Please consult your local Festo service centre if you have any

technical problems.

Notes on the use of this manual

This manual will help you in successfully commissioning your

SEC-ST for the first time.

This manual contains important information and provides you

with the basic knowledge which you will require for operating

the SEC-ST correctly.

Most work steps in this manual are divided into two parts:

the description:

Here you can learn important instructions and the aim of

each work step.

the instructions:

Here you learn how to carry out the work steps.

Contents and general instructions

VIII Festo SEC-ST-48-6-P01-EN en 1507d English

General information on stepping motor systems

Description

Stepping motors are a special type of synchronous motor

triggered through electrical pulses from a required control

unit. Here, a pulse always corresponds to the same rotational

angle. This permits positioning without acknowledgement.

Due to their ”digital” rotation, stepping motors are used as

switch mechanisms and in positioning technology. It should

be noted that the control system does not receive any kind of

acknowledgement that the motor has, in fact, performed its

step.

Accuracy and resolution

The step angle depends on the structural form; for the two-

phase Festo stepping motors type MTR-ST, the angle is 1.8°

(+/-5%) in full step. A single step takes place when the two

coils receive full alternating current. Here, the stepping motor

performs a step of 1.8° each time the current to the coils al

ternates.

But it is also possible to supply the two coils simultaneously

with different current shares. The result is a 1/2, 1/4, 1/5,

1/8, 1/10 or 1/32 of a step, depending on the current share.

This allows considerable refinement in the maximum resolu

tion of positions to which a stepping motor can run.

The smallest incremental path (resolution) on a positioning

axis is determined by the motor’s step angle (number of steps

per revolution) and the feed constant of the positioning axis

(determined by the diameter of the input pinion or the slope

of the spindle).

This can be calculated as follows:

Contents and general instructions

Festo SEC-ST-48-6-P01-EN en 1507d English

Number of steps per revolution +360°

Motor step .angle

Resolution +Feed constant of the axis @Gear multiplication

StepsńRevolution

Example

Motor step angle: 0.9° (+/- 5%) at half-

step

Feed constant of the positioning axis:120mm/revolution

Gear multiplication: 1/4 ( gear reduction i =

4 )

The above example results in a resolution of 0.075 mm per

step.

All positions that this motor-gear-axis combination can run to

are divisible by 0.075.

In contrast, if the motor runs in quarter step, the resolution is

0.0375 mm; in one-tenth step, even a resolution of 0.00375

mm per step would be possible. Axis play, circumferential

backlash of any gears and the tolerance of the stepping mo

tor itself have to be calculated in. The stepping motor’s toler

ance must always be taken into account as the absolute value

of the full step.

This must be considered when very precise positioning as

signments are to be executed.

Contents and general instructions

XFesto SEC-ST-48-6-P01-EN en 1507d English

Basic information

Despite the simplicity of the stepping motors, it should be

mentioned that it is not a controller. The control system does

not receive any kind of acknowledgement whether the motor

has, in fact, performed its step.

And so it is extremely important to dimension the motor using

its speed-torque characteristic curve. This ensures that the

applied load can, in fact, be moved by the motor with the

specified acceleration and speed.

If the motor loses a step, that is, if the applied load is greater

than the force the motor can produce, the part to be posi

tioned is no longer in the desired position. Errors that must

be monitored in the overall system, such as through limit

switches, can thus occur.

Start-stop frequency

Another important variable in the use of stepping motors is

the so-called start-stop frequency. It is the frequency or

speed at which the stepping motor can safely, that is, without

loss of step, start and also stop again under the torque to be

provided.

Losses of step can occur when decelerating (stopping) just as

much as when accelerating!

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