Almanac Based Over Voltage And Under Voltage Control Astronomical Timer :
It is a real time timer which can be used to switch electrical appliances like street lamps, garden lights, corridor lights, neon signs etc. with under voltage and over voltage protection as per time of the day. The timer has built in Almanac timings fixed in Nonvolatile RAM so that the user does not have to programme the unit from time to time. This Almanac time switch has added advantage over daily dial or weekly timers. Timer provides two outputs to drive contactors of different ratings. These outputs can be used with different combinations to achieve desired output. Timer is provided with manual override facility. Optional detachable external keyboard unit provided to avoid unauthorized access.
Neon Sign Boards
School / College Sirens
Rated Supply voltage :- 240v
Rated Frequency :- 50Hz + / - 5%
Current rating :- Max. resistive load of 1.2 kw at 230 VAC
Battery Back up :- In built chargeable battery with over 10 year life
Output channels :-
The timer is available with three channel
Channel A: To switch on/ off street lights as per the Almanac bases yearly start.
Channel B: To switch on/off in conjunction with channel A: as also to switch off/on at.
Channel C: To switch on/off in conjunction with channel A:
Offset time setting :- +/- 60 minutes in 1- minute steps.
Output control :-
1 nos. rated for 10A at 250V AC.
2 nos. rated for 10A at 250V AC.
3 nos. rated for 10A at 250V AC.
Time clock :- Inbuilt Quartz crystal controlled Real time Clock with non- volatile RAM random access memory.
Time range :- ON Time : within ALMANAC Time. As per latitude & longitude
Duration : As per Almanac.(Astronomical)
Switching Accuracy :- +/- 1sec. Max
Recovery Time :- 100m sec. min.
Ambient temp :- 55 C Max .
Humidity :- Max 95%
Protections :- The timer is provided with Protection to avoid any mishandling.
It has u/v170v, o/v 260v, & overload 50A cutoff output facility.
Electrical connections :- Screw type terminals.
External controls And display parameter :-
An 8 - segment LED display panel with membrane key pad
As follows :
An increment key to increase the selected parameters.
A decrement key to decrease the selected parameter.
A set key
Parameter acceptance key.
Display 4 digit seven segment display shows time date, month year, on/off time, voltages & current of the respective phase.
Front panel :-
a) Manual override facility without interruption of power supply to the timer.
An 8- segment LED for continuous display of the current real time of the RTC in Hrs : min on 24 hr.
Additional protections :-
EPROM based programming ( up to 5 years )
Dust- proof rugged & strong cabinet to prevent dust penetration.
RFI/EMI protection - provided.
Isolation between input & output to avoid erratic switching.
Special body design to prevent external tempering.
Dimensions Maximum :- Height x length x width = 150mm x 250mm x 100mm.