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Summary of Contents for Novatech 1730 Series
- Page 1 1730 Series Transmitter Diagnostics Mode Reference Manual Document Revision 1.03 Diagnostics Mode v1.08...
- Page 3 In standard operation the 1730 Series Transmitter runs a real-time operating system; a loop of automated tasks which involve several highly inter-connected systems. Due to this closely integrated nature, it can be difficult to isolate and diagnose specific hardware problems.
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Page 4: Entering Diagnostics Mode
Re-connect power to the transmitter and switch on. At this point, instead of displaying the Novatech logo and usual runtime information the display will say ‘Loading Diagnostics…’ with a version number on the second line. The version number indicates the version of the Diagnostics Mode module compiled into the current EEPROM. -
Page 5: Testing The Display
Novatech Controls 1730 Series Diagnostics Mode Reference Manual Diagnostics Mode Keypad Interaction The Diagnostics Mode consists of a series of numbered tests with user interaction being provided using the local keypad and display. Each individual test is designed to focus on a specific hardware component within the transmitter. -
Page 6: Testing The Keypad
Novatech Controls 1730 Series Diagnostics Mode Reference Manual Testing the Keypad This second preliminary test will check the functionality of the interrupt driven hardware informing the MCU when a key press is detected, as well as testing each of the physical buttons integrated into the lexan on the front panel of the transmitter. - Page 7 Novatech Controls 1730 Series Diagnostics Mode Reference Manual Before doing any more tests, check the four reference voltage test points on the main PCB (Ref 1.. Ref4) and the two analog test points marked +12 & -12 above PS4 (relative to Acom)
- Page 8 Novatech Controls 1730 Series Diagnostics Mode Reference Manual To test the gain circuitry the technician can change the gain using the option up/down keys. The gain multiplexer IC24 changes the feedback resistor for one of the op-amp channels on IC14, resulting in four possible gain ranges for the analog signal into the ADC.
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Page 9: Ambient Temperature Sensor
Novatech Controls 1730 Series Diagnostics Mode Reference Manual For testing the probe EMF input channels, the signal source must be capable of sending a DC voltage signal in the range of -50mV to 2000mV. NOTE: Signals outside of the range of -50mV to 2400mV may damage the analog input circuitry. - Page 10 To test the current feedback there are several methods. The easiest option would be to use a known working CM-15 reference air pump as supplied by Novatech. With the PWM output set to 100% the pump should run with a smooth cadence and draw a continuous current of ~60mA. Another way to test this would be to place a 1/4w 100 ohm resistor between the ref air pump terminals.
- Page 11 The transmitter measures frequency by detecting the zero crossover points of the alternating current signal, and it calculates voltage by assuming the known impedance of the probe heater. This assumption is easily invalidated if the device attached to Heater 1 is not a Novatech Controls supplied model 1231 or 1234 heated probe.
- Page 12 Novatech Controls 1730 Series Diagnostics Mode Reference Manual relays have failed short-circuit. Finally it also confirms that the current transformer and feedback circuit is working. Note: To enable mains power output to Probe 1 a link must be inserted between the burner input terminals 10&11 creating a short-circuit.
- Page 13 Novatech Controls 1730 Series Diagnostics Mode Reference Manual If there is any non-linearity while testing current with LK2 shorted, consider removing Zener diode D14 as this is the cause of any linearization problem. Some newer firmware versions include software linearization to remove the affect of D14, however it is far easier to fix this problem with hardware.
- Page 14 Novatech Controls 1730 Series Diagnostics Mode Reference Manual By using the option keys, the output level can be set as a percentage of full scale at ~25mA. Pressing the enter key toggles the feedback resistor, which allows the technician to read the output either on the terminals on the PCB, or via the feedback to the MCU.
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Page 15: Digital Inputs
21. Alarm Relays Overview: The 1730 series has four mains-power rated alarm relays that can be programmed to perform various functions. Each of these relays is independently controlled via the MCU. This test individually energises each relay allowing the contacts to be tested using a DMM... -
Page 16: Lcd Backlight
Novatech Controls 1730 Series Diagnostics Mode Reference Manual If any of the lexan LEDs are not working then check the signal on the flexible cable between the display PCB and the lexan. The lexan itself is unserviceable, so any failed LEDs would require the replacement of the lexan label. -
Page 17: Watchdog Timer
Modbus Master PC Software available to download on the Novatech Controls website. If this suggests that there is a problem then this diagnostic test can be used to assist in isolating the problem. -
Page 18: Adc Calibration
Novatech Controls 1730 Series Diagnostics Mode Reference Manual 28. ADC Calibration This option is not currently used for testing. Document Revision 1.03 Page 16 of 16 Diagnostics Mode v1.08... - Page 19 Test Point Dig Common 34 Earth 10uF/16v Tant 120R B32022A3103M Y2 0.01uF BAV99 Transorb-DC Title Power supply ArchAPC-10S Novatech Controls 1730 Series Analyser Size Number Revision Master, power and terminals Version 1.2 G Date: 26/02/2016 Sheet of File: J:\Projects------------\..\1732-1 Master.SchDoc Drawn By:...
- Page 20 AVee(5) com-out -out P8-[0..7] P8-[0..7] 10uF/25v Tant AVee DU1P0-05D12 IC27 10uF/25v Tant 79L05 AVee(5) Title Novatech Controls 1730 Series Analyser Size Number Revision Analogue inputs and outputs Version 1.2 G Date: 26/02/2016 Sheet of File: J:\Projects------------\..\1732-3 Analog Sch.Sch Drawn By:...
- Page 21 74HC04 IC18D SGnd RS232 P2-4 P2-[0..7] P2-[0..7] 74HC00 IC10A PC-400 LM1458 SMD SVee Title Novatech Controls SVee 1730 Series Analyser IC19D IC19C IC19E LED1 74HC04 74HC04 SGnd Size Number Revision 74HC04 Serial comms and digital I/O Version 1.2 G RS485...
- Page 22 P5-6 P107/AN7/KI3 P56/ALE P10-[0..7] P10-[0..7] P5-7 P57/RDY/CLKOUT P5-[0..7] P5-[0..7] M16C62P IC17 CNVss CNVss 12mHz Title Novatech Controls 33pF 33pF 1730 Series Analyser Size Number Revision Microprocessor Version 1.2 G Date: 26/02/2016 Sheet of File: J:\Projects------------\..\1732-2 Micro Sch.Sch D rawn By:...
- Page 24 Revision Changelog: Version 1.03 (04-May-2016) Modified ADC counts values in test 01. Reference Voltages Summary Version 1.02 (May 2016) Added chapter on total power failure Version 1.00 (Feb 2016) Initial Release of this document, revised from several other technical documents.
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