PoScope Plasma Cutter Voltage Divider PlasmaDiv User Manual

PoScope Plasma Cutter Voltage Divider PlasmaDiv

Please read the following notes

1. All information included in this document is current as of the date this document is issued. Such information, however, is subject to change without any prior notice.
2.  PoLabs does not assume any liability for infringement of patents, copyrights, or other intellectual property rights of third parties by or arising from the use of PoLabs products or technical information described in this document. No license, express, implied or otherwise, is granted hereby under any patents, copyrights or other intellectual property rights of PoLabs or others. PoLabs claims the copyright of, and retains the rights to, all material (software, documents, etc.) contained in this release. You may copy and distribute the entire release in its original state but must not copy individual items within the release other than for backup purposes.
3.  Descriptions of circuits, software and other related information in this document are provided only to illustrate the operation of the products and application examples. You are fully responsible for the incorporation of these circuits, software, and information in the design of your equipment. PoLabs assumes no responsibility for any losses incurred by you or third parties arising from the use of these circuits, software, or information.
4.  PoLabs has used reasonable care in preparing the information included in this document, but PoLabs does not warrant that such information is error free. PoLabs assumes no liability whatsoever for any damages incurred by you resulting from errors in or omissions from the information included herein.
5.  PoLabs devices may be used in equipment that does not impose a threat to human life in case of the malfunctioning, such as: computer interfaces, office equipment, communications equipment, test and measurement equipment, audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment, and industrial robots.
6.  Measures such as fail-safe function and redundant design should be taken to ensure reliability and safety when PoLabs devices are used for or in connection with equipment that requires higher reliability, for example: traffic control systems, anti-disaster systems, anticrime systems, safety equipment, medical equipment not specifically designed for life support, and other similar applications.
7.  PoLabs devices shall not be used for or in connection with equipment that requires an extremely high level of reliability and safety, as for example: aircraft systems, aerospace equipment, nuclear reactor control systems, medical equipment or systems for life support (e.g. artificial life support devices or systems), and any other applications or purposes that pose a direct threat to human life.
8. You should use the PoLabs products described in this document within the range specified by PoLabs, especially with respect to the maximum rating, operating supply voltage range and other product characteristics. PoLabs shall have no liability for malfunctions or damages arising out of the use of PoLabs products beyond such specified ranges.
9.  Although PoLabs endeavors to improve the quality and reliability of its products, semiconductor products have specific characteristics such as the occurrence of failure at a certain rate and malfunctions under certain use conditions. Further, PoLabs products are not subject to radiation resistance design. Please be sure to implement safety measures to guard them against the possibility of physical injury, and injury or damage caused by fire in the event of the failure of a PoLabs product, such as safety design for hardware and software including but not limited to redundancy, fire control and malfunction prevention, appropriate treatment for aging degradation or any other appropriate measures.
10. Usage: the software in this release is for use only with PoLabs products or with data collected using PoLabs products.
11.  Fitness for purpose: no two applications are the same, so PoLabs cannot guarantee that its equipment or software is suitable for a given application. It is therefore the user’s responsibility to ensure that the product is suitable for the user’s application.
12.  Viruses: this software was continuously monitored for viruses during production, however the user is responsible for virus checking the software once it is installed.
13. Upgrades: we provide upgrades, free of charge, from our web site at www.poscope.com. We reserve the right to charge for updates or replacements sent out on physical media.
14. Please contact PoLabs support for details as to environmental matters such as the environmental compatibility of each PoLabs product. Please use PoLabs products in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances, including without limitation, the EU RoHS Directive. PoLabs assumes no liability for damages or losses occurring as a result of your non-compliance with applicable laws and regulations.
15.  Please contact a PoLabs support at support.poscope.com if you have any questions regarding the information contained in this document or PoLabs products, or if you have any other inquiries.
16.  The licensee agrees to allow access to this software only to persons who have been informed of and agree to abide by these conditions.
17.  Trademarks: Windows is a registered trademark of Microsoft Corporation. PoKeys, PoKeys55, PoKeys56U, PoKeys56E, PoKeys57U, PoKeys57E, PoKeys57CNC, PoScope, PoLabs, PlasmaSens and others are internationally registered trademarks

Description

PlasmaDiv is a galvanically isolated plasma voltage divider 50:1. The isolated start signal can be used to safely interface the THC system with the plasma cutter. PlasmaDiv is developed to be used as an independent device and is compatible with most CNC controller boards on the market and plasma cutters.
Divider offers noise-free arc voltage values attenuated to a safe voltage level, which can be interfaced with standard electronics such as A/D converters and microprocessors. The input stage provides high-frequency filtering. High-voltage terminals were designed for input voltages of up to 500 VDC. Additionally, isolated 10 V input with no attenuation (1:1) is also available.

Electrical specifications

• HV input operating range: 0-500 V,
•  HV input divider ratio: 50:1,
• HV filtering cut-off frequency: 1 kHz
•  LV input (10V) divider ratio: 1:1,
•  Isolated output voltage: 0-10 V,
•  Isolation voltage (RMS): up to 1200 V,
•  Isolation voltage (transients): up to 6000 V,
•  Power supply voltage: 24 V,
• Start output signal – relay output.

LED signalization“5 V” green LED power-on “DIAG” red LED indicates a malfunction of the isolation circuit.

•  The low side does not receive data from the high side (for example: because of a loss of power on the high side). Please disconnect the power and plugin again.
•  The high-side DC/DC output voltage (plasma voltage) or the high-side LDO output voltage drop below their respective Undervoltage detection. In this case, the low side may still receive data from the high side but the data may not be valid.
• During normal operation, the DIAG pin is in a high-impedance state. Connect the DIAG pin to a pull-up supply through a resistor or leave open if not used.

Terminals and pinout

ARC_VOLTAGE terminal

SC terminal:

Pay attention – correct connection on terminals ARC_START terminal – connect to start input of the plasma cutter:

Connection to the PoKeys57CNC and plasma cutter equipment

The PlasmaDiv device is prepared for two possible connections to the plasma cutter equipment. A max 500 V input for direct connection and 10 V input for connection using divided plasma cutter output. Only one input can be used at a time

Direct connection
In case your plasma cutter does not support voltage-divided output, you should connect it directly to HV input as shown in Figure 2.

Divided voltage connection
For connection using divided voltage output note the following instruction (Figure 3). Please refer to your plasma cutter owner’s manual for detailed information about divided output voltage and connector pinout. Remember PlasmaDiv has 10 V input isolation 1:1. PlasmaDiv 0-10 V output connection to PoKeys must implement resistant divider (shown in the connection diagram below), because PoKeys ADC connector inputs works 0 – 3.3 V. Pay attention to the resistor voltage divider, it is the users responsibility to implement correctly.

Mach3 – PlasmaDiv configuration

Download and install the latest PoKeys Mach3 plugin from www.poscope.com. Look for the PoKeys setup package, which also includes the Mach3 plugin.
Power on PlasmaDiv and PoKeys57CNC controller. Run Mach3 software. In Mach3 software under Plugin Control-> Configure PoKeys57CNC->Device settings, you will find the Pulse engine settings tab. Note that all voltages have a divider factor of 30 applied (1:10 by the PlasmaDiv and an additional 1:3 by the resistor voltage divider). Enter all voltages in the range between 0 and V. You can change the following parameters:

Reference Height
desired arc voltage (please refer to your plasma cutter owner’s manual)

Deadband
voltage hysteresis (voltage frame around reference height, a range where the position of the Z-axis is kept stationary)

Gain
correcting motion gain (reduce the gain if the torch height is oscillating)

Arc OK range
voltage range where THC is enabled (reference height ± arc OK range)

Anti-dive limit
arc voltage that disables THC. If the voltage goes above the Anti-dive limit, the Z-axis position will not be updated. The parameter’s value must be higher than the Reference height. This functionality can be enabled or disabled by checking or unchecking the parameter.

Mach4 – PlasmaDiv configuration

Download and install the latest PoKeys Mach4 plugin from https://www.poscope.com/. Unzip and copy files: Mach4PoKeysPlugin.m4pw and Mach4PoKeysPlugin.sig to “Mach4\Plugins” folder. Run Mach4 (Plasma profile)

• Go to Configure –> Control… -> Axis Mapping tab and enable axis X (0), Y (1), Z (2) and OB1. Mach4 plasma THC is handled with a so-called out-of-band(OB) motor. For example: if your THC plasma cutter uses Motor2 for Z-axis you will need also to enable axis OB1(6) and select motor for that axis.
• Under the Motors tab enable Motors for X (0), Y (1), Z (2), and OB1 (6). The motor tuning settings for Motor5 (OB1 (6)) must match those of Motor 2 (Z)!

Please read also Mach4 user’s documentation located in the Mach4 folder Docs\Plasma_Configuration.pdf

• Configure –> PlasmaScreenConfiguration
•  Set Default THC mode: Analog; THC Axis: 6
• Set Analog voltage input register: PoKeys_xxxxx/Analog input 42

Note
that all voltages have a divider factor of 30 applied (1:10 by the PlasmaDiv and an additional 1:3 by the resistor voltage divider). Enter all voltages in range between 0 and 3.3 V.

• Check “Use Analog Voltage for Arc OK” and set the Arc OK signal active frame (Min/Max Voltage)

Use Mach4 THC Cut Start Settings and THC tab to set-up cutting parameters. If “Touchoff” is included the Probe input must be mapped! (Configure –> Control… -> Input signals tab)

Grant of license

The material contained in this release is licensed, not sold. PoLabs grants a license to the person who is using any compatible PoLabs product, subject to the conditions listed below.

Access
The licensee agrees to allow access to this manual only to persons who have been informed of and agree to abide by these conditions.

Usage
The information in this release is for use only with PoLabs products.

Copyright
PoLabs claims the copyright of, and retains the rights to, all material (software, documents etc) contained in this release. You may copy and distribute the entire release in its original state, but must not copy individual items within the release other than for backup purposes.

Liability
PoLabs and its agents shall not be liable for any loss or damage, howsoever caused, related to the use of PoLabs equipment or software unless excluded by statute.

Fitness for purpose
No two applications are the same, so PoLabs cannot guarantee that its equipment or software is suitable for a given application. It is therefore the user’s responsibility to ensure that the product is suitable for the user’s application.

Mission Critical applications
Because the software runs on a computer that may be running other software products and may be subject to interference from these other products, this license specifically excludes usage in ‘mission-critical applications, for example, life support systems.

Errors
This manual was continuously monitored for errors during production, however, the user is responsible for error checking the manual once it is used.

Support
There could be errors in these manual, but if you found some, please contact our technical support staff, who will try to fix the problem within a reasonable time.

Upgrades
We provide upgrades, free of charge, from our website at www.poscope.com. We reserve the right to charge for updates or replacements sent out on physical media.

Trademarks
Windows is a registered trademark of Microsoft Corporation. PoKeys, PoKeys55, PoKeys56U, PoKeys56E, PoKeys57U, PoKeys57E, PoKeys57CNC, PoScope, PoLabs, PoExtBus, PoExtBus Smart, PoRelay8, PlasmaSens and others are internationally registered trademarks.support: www.poscope.com

References

• PoLabs Support
• PoLabs web store - Polabs
• PoLabs web store - Polabs
• PoLabs web store - Polabs

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