Summary of Contents for Alma Nex
- Page 1 Thermal protection device for electric units 4 analog input channels, 4 output relays USER’S MANUAL Elettronica S.r.l. rev 2.2 08/05/2024...
- Page 2 The ALMA Elettronica S.r.l.company can modify the device and this manual without notice Manual Code M0002...
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Page 3: Table Of Contents
Index Figure Index Introduction Device Overview Technical specifications Cutions Installation Instructions Device and accessories description Frontal panel Back panel and accessories Mechanical installation Electrical connections Power Supply Relays outputs connection Probes connection Instructions for use Visualisation and keyboard use Navigation on pages Programming Description of programmable data Solution of problems... - Page 4 Figure index Transformer with probes Figure 1 Front view Figure 2 Figure 3 Rear view and accessories Dimensions Figure 4 Electrical connection Figure 5 Figure 6 Probes connection Navigation on pages Figure 7 Alarm working show Figure 8 Power supply Figure 9...
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Page 5: Introduction
This manual gives you the information you need when you install and configure the NEX device. For a useful usage of this manual, we suggest you to read it standing near to the NEX device to directly verify the instructions. -
Page 6: Technical Specifications
Technical specifications Power supply — Rated values 24 ÷ 380 Vdc and 24 ÷ 260 Vac with frequency 40÷60 Hz — Maximum permissible values 20 ÷ 390 Vdc and 20 ÷ 265 Vac — Without polarity respect for DC supply —... -
Page 7: Cutions
— Probe diagnosis Device working temperature from -25°C to +65°C — — Humidity less than 95% non-condensing — Conforms to CE standards — User data storage for 10 years without powering the device — Self-diagnosis of device functionality — Alarm signalling for incorrect operation or incorrect programming of user data Displaying and data management —... -
Page 8: Installation Instructions
Installation Instructions For a right operation, the NEX device has to be installed compliance to the requirements reported in the Technical Specifications paragraph. The device provides fixing accessories and removable terminals for electrical connections. Description of device and accessories Elettronica... -
Page 9: Back Panel And Accessories
Probe faulty or not connected System in control not active (data programming mode) 4. Key v second function. Pressed in conjunction with the enter key (7), the programming mode is entered. In this mode it allows movement to the digits to be changed. -
Page 10: Mechanical Installation
105 mm Figure 4 Mechanical installation The NEX has a black self-extinguishing PPO housing for flush mounting. The dimensions are in accordance with the DIN 43700 unification standard: cross-section of 96 mm x 96 mm and maximum depth of 105 mm. -
Page 11: Connecting Relay Outputs
overvoltages. Failure caused by incorrect power supply is not covered by warranty. Connecting Relay Outputs The figure opposite shows the position of the relays at rest (device switched off). Alarm relays are energised when programmed thresholds are exceeded. The Generic Alarm relay operates in intrinsic safety, so it is energised when the device is switched on if there are no error conditions, and is de-energised if the device is switched off or if there is a probe error. -
Page 12: Instructions For Use
Instructions for use Displaying and using the keyboard On the NEX device, measured temperatures and setting data are displayed in pages navigable via the keyboard. This type of visualisation is not only very intuitive to use, but also allows several pieces of data from the same area to be displayed simultaneously. -
Page 13: Programming
Page 6 displays hysteresis, delay, self-check and pulse trip data. Page 7 displays the Setpoints of the three alarm levels set for probe D. Page 8 displays the Setpoints of the three alarm levels set for probes A, B and C. Page 9 gives access to page 9b which enables or disables each individual probe Page 10 displays the maximum values of the temperatures measured by each probe. - Page 14 By entering the programming mode, pressing the keys v and å at the same time, Ÿ on page 2 it is possible to choose between two different options for operating the backlight of the Display. If the light is always on, the backlight will be on regularly.
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Page 15: Description Of Programmable Data
system compares the new maximum with the measured temperatures, which will undoubtedly be higher, and therefore the maximums will be instantly updated with the new values. Simultaneously pressing the keys v and å, on the main page (page 1), silences the alarms if the automatic signalling system has been programmed (see paragraph description of programmable data). - Page 16 temperature. The horizontal straight lines represent the programmable alarm temperature threshold (setpoint) and this minus the hysteresis temperature. The alarm status is shown at the bottom of the graph, where an alarm is defined as the closure of the relevant relay. At time T the temperature representative curve exceeds the setpoint, but the alarm is not activated because the temperature returns below the setpoint before the end of the delay...
- Page 17 Min. Max. Name of Programm Program Standard Notes Datum able mable Values value Value SET ABC A1 0 °C 199 °C 100 °C First alarm level for A, B e C probes SET ABC A2 0 °C 199 °C 120 °C This datum has to be greater than SET ABC A1 SET ABC A3...
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Page 18: Solution Of Problems
Solution of problems In this paragraph we give you some suggestions to solve anomalies you can meet using the NEX device. Problem Solution The NEX device doesn’t Verify the connection to the power supply. turn on Verify there is line voltage. - Page 19 Problem Solution The measured Verify the value of the set datum of hysteresis and temperature is lower control if the measures temperature in lower than the than the setpoint but the threshold minus this value: the alarm stops only when corresponding alarm is the temperature undergoes the setpoint minus the activated...
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Page 20: Guarantee Conditions
Guarantee conditions The thermal protection NEX devices are covered by guarantee for a period of 24 months since the consignment date for anomalies due to production defects. The guarantee consists in the free repair or substitution of the components that have been damaged in the devices' construction, arrived at our office carriage paid. - Page 21 This can occur when you insert the general switch of the installation without load. The phenomenon is particularly evident when the NEX is directly supplied by the copper bars of the secondary circuit of the transformer and fixed re- phasing capacitor batteries are present.
- Page 22 Notes 1. . In the frequency range of 200 MHz to 300 MHz in case of electromagnetic fields higher or equal to 10 V/m ( About 100 W at 5 meters from the device) the temperature reading of the device may be raised by eight digits.
- Page 23 Notes...
- Page 24 Elettronica S.r.l. via dell’Indipendenza, 13 40069 Zola Predosa (BO) Italy tel +39 51 6762544 info@almaelettronica.it Www.almaelettronica.it...
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