KNozz 3D Printer Extruder Nozzle and Part Bed Heater Interface
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Please view our on-line documentation for full details.
What is KNozz?
KNozz is the latest edition to our line-up designed to control the Nozzle Heater and Bed Heater for an Extrusion Type 3D Printer.
KNozz provides two Thermistor Inputs to allow KFLOP to monitor the temperature of both the Extruder Nozzle and Bed Heater Platform. 12-bit ADC converter provides better than 1 degree C temperature repeatability.
Two High Current, Independent, and Optically Isolated FET switches allow controling the Nozzle and Bed Heaters. Super low on resistance of only 2.1 milli-ohms permits continuous currents of upt to 20 Amps with no heat sinking required. Channels isolated from each other and may use separate supplies.
- Safety Watchdog automatically disables heater outputs whenever temperatures are not being actively monitored.
- An additional opto-isolated analog output is provided for general use.
- 3 LED status indicators for: Watchdog Enable, Nozzle Heat Powered and Driven, Bed Heat Powered and Driven.
- Simple 16-pin ribbon connection to KFLOP JP4 provides logic power and data communication to/from KFLOP.
- CNC Application Note: KNozz may also be used in CNC Applications to provide an isolated analog Spindle Speed Output, two isolated switches for Spindle On/Off/Direction Control, and 2 analog inputs for FRO and SSO potentiometer inputs.
- See also: Converting a milling machine to a 3D printer in 3 easy steps.
Highlights
- ADC Nozzle Thermistor Input for Temperature Measurement
- ADC Bed Thermistor Input for Temperature Measurement
- 20Amp 48V Opto-Iso FET Switch for Nozzle Heater Element
- 20Amp 48V Opto-Iso FET Switch for Bed Heater Element
- Heaters Watch Dog
- Isolated PWM to Analog Converter
- 3 LED Status Indicators for Watch Dog, Bed, and Nozzle Heaters
- Thermistor Voltage Reference
- Direct Connection to KFLOP JP6
- Screw Terminals
Konnect Block Diagram
Hardware Specifications
| Function | Parameter | Specification |
|---|---|---|
| Inputs | Number Type Resistor Divider Formula Filter Cap, Tau VRef ADC |
2 Analog Inputs Themistor 100K ohm type 10K ohm 1% ADC = 10K / (10K + Rin) * 4095 0.1uF, RC = 1 millisecond 3.3V +/- 1% 12-bit |
| Outputs | Number Type Max Current Max Voltage On Resistance |
2 FET Outputs (NPN Type) Full Opto Isolation 20 Amps 48V 2.1 milli ohms |
| Analog | Number Input Supply Range Output Impedance Response Tau |
1 Fully Isolated Output 5-30V <1K ohm 10ms |
| Connectors | JP1 Aux Bus to KFLOP J1 - Bed Heat Element J2 - Nozzle Heat Element J3- Analog J4 - Thermistors/VRef |
16 pin Header (IDC 0.1 inch pinch) 4 pin Pluggable Term 5mm Amphenol-FCI TJ04715000J0G 4 pin Pluggable Term 5mm Amphenol-FCI TJ04715000J0G 4 pin Pluggable Term 5mm Phoenix Contact 1934887 4 pin Pluggable Term 5mm Phoenix Contact 1934887 |
| Logic Supplies | Voltage VDD5 Max Current |
+5V ±10% (supplied by KFLOP) 0.1 Amps |
| Environment | Operating Temperature Storage Temperature Humidity Lead |
0-40° C 0-40° C 20-90% Relative Humidity, non-condensing Lead Free RoHS |
| Dimensions | Length Width Height |
2.0 inches (50.8mm) 4.5 inches (114mm) 0.75 inches (19mm) |