1. પરિચય
This manual provides detailed instructions for the installation, setup, programming, and operation of the ORNO PRE-450 Astronomical Time Programmer. This digital timer is designed for DIN rail mounting and offers advanced scheduling capabilities, including astronomical functions, to control various electrical devices.
2. સલામતી માહિતી
Please read this section carefully before installation and operation to ensure safe use and prevent damage to the device or injury. Installation should only be performed by a qualified electrician.
- સ્થાપન અથવા જાળવણી પહેલાં પાવર ડિસ્કનેક્ટ કરો.
- સપ્લાય વોલ્યુમની ખાતરી કરોtage matches the device specifications (24-264V AC/DC).
- Do not exceed the maximum current rating of 16A.
- Protect the device from moisture and extreme temperatures outside the operating range (-20°C to +55°C).
- The device is designed for indoor use and DIN rail mounting.
3. ઉત્પાદન ઓવરview અને લક્ષણો
The ORNO PRE-450 is a versatile digital time programmer equipped with an astronomical clock function. It automatically calculates sunrise and sunset times based on geographical location and time zone, allowing for precise control of connected devices.
મુખ્ય લક્ષણો:
- Astronomical Function: Automatically adjusts switching times based on sunrise and sunset.
- Multiple Program Types: Supports weekly, annual, and astronomical programming.
- 52 Switching Points: Allows for flexible and detailed scheduling.
- ઇન્ટિગ્રેટેડ બેટરી: Maintains clock settings and program memory for up to 10 years during power outages
- ઓપરેટિંગ મોડ્સ: Manual, Automatic, Holiday, and Random modes.
- Night Pause Function: Define periods when the device remains off, even during astronomical ON times.
- કાઉન્ટડાઉન કાર્ય: For temporary switching operations.
- બહુભાષી મેનુ: Available in 3 languages.
- ડીઆઈએન રેલ માઉન્ટિંગ: Easy integration into electrical panels.

આકૃતિ 1: ફ્રન્ટ view of the ORNO PRE-450 Astronomical Time Programmer, showing the digital display and control buttons.
4. સ્થાપન
The ORNO PRE-450 is designed for mounting on a standard DIN rail (TH-35mm). It occupies two DIN modules in width.
સ્થાપન પગલાં:
- પાવર ડિસ્કનેક્શન: આગળ વધતા પહેલા ખાતરી કરો કે ઇન્સ્ટોલેશન વિસ્તારનો મુખ્ય વીજ પુરવઠો સંપૂર્ણપણે ડિસ્કનેક્ટ થઈ ગયો છે.
- માઉન્ટ કરવાનું: Clip the device onto the DIN rail.
- વાયરિંગ: Connect the power supply and load according to the wiring diagram provided on the device and below. Ensure all connections are secure.
- પાવર રિકનેક્શન: Once all connections are verified, restore power to the installation.

આકૃતિ 2: બાજુ view of the ORNO PRE-450, illustrating the wiring diagram for connecting power (N, L) and the relay output (18, 15, 16, A2).
વાયરિંગ વિગતો:
- એ૧/એ૨: Power supply input (24-264V AC/DC).
- 18, 15, 16: Relay output contacts. 15 is common, 18 is normally open (NO), 16 is normally closed (NC).
5. પ્રારંભિક સેટઅપ
શરૂઆતના પાવર-અપ પર અથવા લાંબા સમય સુધી પાવર આઉટપુટ પછીtage, you may need to set the basic parameters.
5.1. ભાષા પસંદગી
- દબાવો મેનુ બટન
- Navigate to the Language setting using the arrow buttons (▲ / ▼).
- દબાવો OK પસંદ કરવા માટે.
- Choose your desired language (e.g., English) and press OK ખાતરી કરવા માટે.
5.2. તારીખ અને સમય સેટિંગ
- From the main menu, navigate to "Time/Date" or similar.
- Use the arrow buttons to adjust the year, month, day, hour, and minute.
- દબાવો OK after each adjustment to confirm and move to the next field.
- The device supports automatic summer/winter time switching. Ensure this setting is enabled if desired.
5.3. Astronomical Settings (Geographical Coordinates)
For the astronomical function to work correctly, you must input your geographical coordinates (latitude and longitude) and time zone.
- Navigate to the "Astronomical" or "Location" settings in the menu.
- Enter the latitude and longitude of your location. These can be found using online maps or GPS services.
- Set the correct time zone offset (e.g., +1 for Central European Time).
- Confirm settings with OK.
6. ઓપરેટિંગ મોડ્સ
The ORNO PRE-450 offers several operating modes to suit different needs:
- સ્વચાલિત મોડ: The device operates according to the programmed schedules (weekly, annual, astronomical). This is the standard operating mode.
- મેન્યુઅલ મોડ: Allows you to manually switch the output ON or OFF, overriding any active programs. This is typically for temporary control.
- રજા મોડ: Suspends all regular programs for a specified period, useful for vacations or extended absences.
- રેન્ડમ મોડ: Introduces random variations to programmed ON/OFF times, often used for presence simulation.
To switch between modes, access the "Operating Mode" option in the main menu and select the desired mode using the arrow and OK બટનો
7. પ્રોગ્રામિંગ સમયપત્રક
The device supports up to 52 switching points across various program types.
7.1. Astronomical Program
This program type uses the calculated sunrise and sunset times. You can set an offset (e.g., turn on 15 minutes before sunset or turn off 30 minutes after sunrise).
- Go to "Programs" in the menu and select "Astronomical".
- Choose to set an ON or OFF event.
- Select "Sunrise" or "Sunset" as the trigger.
- Set an optional offset in minutes (e.g., -15 for 15 minutes before, +30 for 30 minutes after).
- Specify the days of the week for this program to be active.
- સાથે પુષ્ટિ કરો OK.
7.2. Weekly/Annual Programs
These programs allow you to set specific ON/OFF times for particular days of the week or dates of the year.
- Go to "Programs" and select "Weekly" or "Annual".
- Choose an empty program slot.
- Set the desired ON time (hour and minute).
- Set the desired OFF time (hour and minute).
- For weekly programs, select the days of the week. For annual programs, select the specific date(s).
- સાથે પુષ્ટિ કરો OK.
7.3. Night Pause Function
The night pause function allows you to define a period during which the output will remain OFF, overriding any ON commands from other programs, typically used during nighttime hours.
- Navigate to "Night Pause" in the menu.
- Set the start time for the pause.
- Set the end time for the pause.
- Enable the night pause function.
- સાથે પુષ્ટિ કરો OK.
8. જાળવણી
The ORNO PRE-450 is designed for maintenance-free operation. However, periodic checks are recommended.
- ખાતરી કરો કે ઉપકરણ ધૂળ અને કાટમાળથી મુક્ત છે.
- Verify that all wiring connections remain secure.
- The internal battery (CR2450) has a lifespan of approximately 10 years for memory backup. If the device frequently loses time or program settings after power outages, the battery may need replacement by a qualified technician.
9. મુશ્કેલીનિવારણ
| સમસ્યા | સંભવિત કારણ | ઉકેલ |
|---|---|---|
| ઉપકરણ પાવર ચાલુ કરતું નથી. | પાવર સપ્લાય નથી કે ખોટી વાયરિંગ નથી. | Check power connections (A1/A2) and ensure power is supplied. Verify wiring against diagram. |
| Programs are not executing. | Device is in Manual or Holiday mode; incorrect program settings; Night Pause active. | Switch to Automatic mode. Review program settings for correct times and days. Check Night Pause settings. |
| Astronomical function is inaccurate. | Incorrect geographical coordinates or time zone. | Verify and correct latitude, longitude, and time zone settings. |
| Time/date resets after power outage. | Internal battery (CR2450) is depleted or faulty. | The internal battery may need replacement. Contact a qualified technician. |
10. ટેકનિકલ વિશિષ્ટતાઓ
| બ્રાન્ડ | અથવા ના |
| મોડલ | PRE-450 |
| પુરવઠો ભાગtage | 24 - 264 V AC/DC |
| મહત્તમ વર્તમાન | 16 એ |
| રેટ કરેલ લોડ | 2300 ડબ્લ્યુ |
| આવર્તન | 50/60 હર્ટ્ઝ |
| કાર્યક્રમોની સંખ્યા | 52 |
| Number of Relay Outputs | 1 |
| ઓપરેટિંગ મોડ્સ | Manual, Automatic, Holiday, Random |
| પ્રોગ્રામના પ્રકારો | Weekly, Annual, Astronomical |
| ન્યૂનતમ ઓપરેટિંગ સમય | 1 મિનિટ |
| સંકલિત બેટરી | CR2450 (Memory backup: 10 years) |
| માઉન્ટ કરવાનું | DIN rail (TH-35mm) |
| પ્રોટેક્શન ઇન્ડેક્સ (IP) | 20 |
| ઓપરેટિંગ તાપમાન | -20 °C થી +55 °C |
| પરિમાણો (L x W x H) | 6.4 x 3.6 x 9 સેમી |
| વજન | 135 ગ્રામ |

Figure 3: Dimensional drawing of the ORNO PRE-450, indicating key measurements for installation.
11. વોરંટી અને સપોર્ટ
For warranty information, please refer to the terms and conditions provided at the point of purchase. For technical support or further assistance, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.
Manufacturer: ORNO





