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Leadshine Technology M542T User Manual Download Page 8

M542T Microstepping Driver Manual V1.0

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7

Dynamic current setting

Peak Current

Ref Current (Screen printing)

SW1

SW2

SW3

1.5A

1.0A

ON

ON

ON

2.0A

1.4

Ａ

OFF

ON

ON

2.4A

1.7A

ON

OFF

ON

2.8A

2.0A

OFF

OFF

ON

3.2A

2.3A

ON

ON

OFF

3.7A

2.6A

OFF

ON

OFF

4.2A

3.0A

ON

OFF

OFF

4.5A

3.2A

OFF

OFF

OFF

Notes:

Ref Current table on the screen printing is used for the users of the M542T to refer.

Due to motor inductance, the actual

current in the coil may be smaller than the dynamic current setting, particularly under high speed condition.

Standstill current setting

SW4 is used for this purpose. OFF meaning that the standstill current is set to be half of the selected dynamic current, and ON
meaning that standstill current is set to be the same as the selected dynamic current.
The current automatically reduced to 60% of the selected dynamic current one second after the last pulse. Theoretically, this will
reduce motor heating to 36% (due to P=I

2

*R) of the original value. If the application needs a different standstill current, please

contact NC-Tech.

8. Wiring Notes

In order to improve anti-interference performance of the driver, it is recommended to use twisted pair shield cable.

To prevent noise incurred in PUL/DIR signal, pulse/direction signal wires and motor wires should not be tied up together. It is

better to separate them by at least 10 cm, otherwise the disturbing signals generated by motor will easily disturb pulse direction
signals, causing motor position error, system instability and other failures.

If a power supply serves several drivers, separately connecting the drivers is recommended instead of daisy-chaining.

It is prohibited to pull and plug connector P2 while the driver is powered ON, because there is high current flowing through motor

coils (even when motor is at standstill). Pulling or plugging connector P2 with power on will cause extremely high back-EMF voltage
surge, which may damage the driver.

9. Sequence Chart of Control Signals

In order to avoid some fault operations and deviations, PUL, DIR and ENA should abide by some
rules, shown as following diagram:

Figure 11: Sequence chart of control signals

Summary of Contents for M542T

Page 1: ...User s Manual For M542T High Performance Microstepping Driver Version 1 0 2011 All Rights Reserved Attention Please read this manual carefully before using the driver ...

Page 2: ...tomatic idle current reduction 16 selectable resolutions in decimal and binary up to 51 200 steps rev Suitable for 2 phase and 4 phase motors Short voltage over voltage over current and short cicuit protection Applications Suitable for a wide range of stepping motors from NEMA size 17 to 34 It can be used in various kinds of machines such as X Y tables labeling machines laser cutters engraving mac...

Page 3: ...f the pins and related issues are presented in section 4 5 9 Connector P1 Configurations Pin Function Details PUL Pulse signal In single pulse pulse direction mode this input represents pulse signal 4 5V when PUL HIGH 0 0 5V when PUL LOW For reliable response pulse width should be longer than 1 5μs Series connect resistors for current limiting when 12V or 24V used The same as DIR and ENA signals P...

Page 4: ...ts including open collector and PNP output The M542T has 3 optically isolated logic inputs which are located on connector P1 to accept line driver control signals These inputs are isolated to minimize or eliminate electrical noises coupled onto the drive control signals Recommend use line driver control signals to increase noise immunity of the driver in interference environments In the following ...

Page 5: ... The higher torque configuration or full coil uses the full windings of the phases Half Coil Configurations As previously stated the half coil configuration uses 50 of the motor phase windings This gives lower inductance hence lower torque output Like the parallel connection of 8 lead motor the torque output will be more stable at higher speeds This configuration is also referred to as half choppe...

Page 6: ... output current properly Generally speaking supply voltage determines the high speed performance of the motor while output current determines the output torque of the driven motor particularly at lower speed Higher supply voltage will allow higher motor speed to be achieved at the price of more noise and heating If the motion speed requirement is low it s better to use lower supply voltage to decr...

Page 7: ... shown below Microstep Resolution Selection Microstep resolution is set by SW5 6 7 8 of the DIP switch as shown in the following table Microstep Steps rev for 1 8 motor SW5 SW6 SW7 SW8 2 400 ON ON ON ON 4 800 ON OFF ON ON 8 1600 ON ON OFF ON 16 3200 ON OFF OFF ON 32 6400 ON ON ON OFF 64 12800 ON OFF ON OFF 128 25600 ON ON OFF OFF 256 51200 ON OFF OFF OFF 5 1000 OFF ON ON ON 10 2000 OFF OFF ON ON 2...

Page 8: ... due to P I2 R of the original value If the application needs a different standstill current please contact NC Tech 8 Wiring Notes In order to improve anti interference performance of the driver it is recommended to use twisted pair shield cable To prevent noise incurred in PUL DIR signal pulse direction signal wires and motor wires should not be tied up together It is better to separate them by a...

Page 9: ...xceeds the limit Short Circuit Protection Protection will be activated in case of short circuit between motor coils or between motor coil and ground 11 Frequently Asked Questions In the event that your driver doesn t operate properly the first step is to identify whether the problem is electrical or mechanical in nature The next step is to isolate the system component that is causing the problem A...

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