Yearly Programmable Timer（Wall-Mount Type） QT-7800 Series
3 circuits
- QT-78301
- QT-78302
SEIKO QT-7800 Series is a high-precision quartz master clock equipped with a yearly programmable timer function.
It is so high-quality as well as high-capacity as to allow up to 1,000 steps of programs to be set and have 8 channels of contact signal outputs to control various devices, offering the customers a wide varieties of functions to meet their requirements.
In addition, the programs can be set easily using computer application software, and they can be imported into the Yearly Programmable Timer by using USB memory.
(1) Master clock function (QT-7810X, QT-7820X and QT-7830X)
Up to 30 secondary clocks can be connected to each secondary clock circuit (if the current consumption of each secondary clock is 12 mA).
(2) External synchronization function
By connecting a 30-sec. polarized signal with the external synchronization input, the loss/gain of the clock is corrected automatically. Besides, by inputting a serial time signal (RS-422), the clock is kept in constant sync with the input time.
(3) Time correction with GNSS
(when connected with an optional GNSS receiver GNS-300)
By connecting a GNSS receiver (GNS-300), the time is automatically corrected on a regular basis.
(4) Time server function
It can bring the time of secondary clocks, computers, and other devices on the network into sync with the time of QT-7800 Series.
Related products
Functions
Secondary clock circuits
3 circuits
Master Clock
Crystal oscillator frequency
4.194304 MHz
Time accuracy
Weekly rate of less than ±0.7 seconds (+5℃~+35℃); 0 seconds after time correction
Time display
【Master clock】
Hour, minute, seconds and date; Year, month, date and day-of-week; Digital 24 hour indication (not displayed during power failure)
【Monitor clock】
30-second interval hand movement
Time setting
【Master clock】
Setting year, month, date, hour and minute and resetting seconds to “00”
【Monitor clock】
60X speed quick advance of hands by APC system
Daylight saving time
Set by program imported via USB memory
Leap second adjustment
Setting by operation switches * Leap second adjustment is made automatically.
Driving of secondary clock
【Driving signal】
DC 24 V; 30-sec. polarized signal; Pulse width of 0.5 sec.; No-contact
【Max. number of secondary clocks to drive】
90 units（12mA/unit, 30 units/circuit）
【Maximum driving capacity】
1,080mA（360mA/circuit）
【Backup power】
DC 24V; Built-in sealed Ni-Cd Ni-MH rechargeable battery
【Battery protection】
Overdischarge prevention circuit
【Signal voltage detection】
Signal voltage stopper(stops output when secondary clock driving voltage lowers)
External synchronization input
DC24V, 30-sec. polarized signal, Every hour
(Synchronizable loss/gain range: Less than 15 seconds)
External synchronization output
RS-422
Time server
LAN interface: 10BASE-T, 100BASE-Tx
Protocol: SNTPv3, SNTPv4
Yearly Programmable Timer
Control system
Control by CPU
Output circuit
8 independent channels; Contact output (make contact)
Switching of output operation
Manual switching available for each channel (auto, stop and manual）
Load capacity(per circuit)
Resistance load … AC 125V 16A, AC 277V 10A, DC 30V 10A
Maximum allowable voltage … AC 277V, DC 30V
Maximum allowable current … 16A (AC 125V), 10A (DC 30V)
Minimum applicable load … DC 5V 100mA
Output type
【Time signal】
Minimum unit of designated time setting … 1 minute
Minimum unit of duration setting … 1 second
Rise time … Selection from 0, -3, -10 and -30 seconds
【“Keep”】
Minimum unit of designated time setting … 1 minute
Minimum unit of duration setting … 1 second;Settable range … 1 minute~2 years
Program setting
Set on PC and imported via USB memory
Program review
Indicated on LCD digital display by switch operation
Program
【Yearly program】
Designating up to 99 weekly programs for Basic, Period, National Holiday, and Special Day settings.
Programmable period … 2 years including this year (Basic setting can be used repeatedly)
【Weekly program】
Maximum number of weekly programs engaged … 99
Programmable period … 1 week (can be used repeatedly)
Maximum number of programs engaged
1,000 steps (total steps in 8 channels)
General
Input power supply
■QT-78X01 : AC 110V±10%, 50/60Hz
■QT-78X02 : AC 220V±10%, 50/60Hz
Power consumption
55W
Power failure backup
【Program 】
Retention of programs in EEPROM for approx. 10 years
【Master clock】
Approx. 5 years (no indication on digital display, counting by internal clock only)
【Secondary clock drive】
30 hours (in case of power failure of more than 30 hours, hands are adjusted automatically after recovery.)
Operational temperature range
-10℃~+50℃
Outer dimensions
W420×H442×D110 (mm)
Weight
Approx. 10kg
Enclosure
【Front panel】
ABS and steel, pearl gray with a slight gloss
【Rear panel】
Steel, pearl gray with a slight gloss
Accessories
Plastic foot, 4 pcs;
Miniature fuse,
Instruction manual;
Mounting hole drilling template;
Insulated crimp terminal; USB memory; and application software
Options
GNSS Receiver GNS-300;
Rack mounting fittings (in accordance with EIA Standard)
Remarks
*EIA compliant（Options）
【E354】
Outer dimensions: W480×H354 (mm) (when mounted to the main body)
Weight: Approx. 2 kg
Casing finish: stainless steel with coating finish (pearl gray with a slight gloss)
【E442】
Outer dimensions: W480×H442 (mm) (when mounted to the main body)
Weight: Approx. 2.5 kg
Casing finish: stainless steel with coating finish (pearl gray with a slight gloss)
