Seiko Time Creation QT-78301/QT-78302 Yearly Programmable Timer

Manufacturer: Seiko Time Creation Inc.
Model: QT-78301/QT-78302

Overview

SEIKO QT-7800 Series: High-Precision Quartz Master Clock
The SEIKO QT-7800 Series is a high-precision quartz master clock with a yearly programmable timer, supporting 1,000 program steps and 8 contact signal outputs. You can easily set programs via computer software and import them using USB memory.

Features:

Master Clock Function: Connect up to 30 secondary clocks per circuit.
External Synchronization: Correct time loss/gain with a 30-sec polarized signal and keep time in sync via RS-422.
GNSS Time Correction: Automatically correct time when connected to a GNSS receiver (GNS-300).
Time Server: Sync secondary clocks, computers, and other devices on the network.

Specification

Feature	Specification
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, date; Year, month, day-of-week; Digital 24-hour indication (no display during power failure).
Time Display (Monitor Clock)	30-second interval hand movement
Time Setting (Master Clock)	Setting year, month, date, hour, and minute, resetting seconds to “00”
Time Setting (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; automatically adjusted
Driving of Secondary Clock	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
External Synchronization Output	RS-422
Time Server	LAN interface: 10BASE-T, 100BASE-Tx, Protocol: SNTPv3, SNTPv4
Yearly Programmable Timer	Control system: CPU, 8 independent channels, Contact output (make contact)
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
Time Signal Output (Time Unit)	Minimum unit of designated time setting: 1 minute, Minimum unit of duration: 1 second
Program Setting	Set on PC and imported via USB memory
Program Review	Indicated on LCD digital display by switch operation
Yearly Program	Up to 99 weekly programs for Basic, Period, National Holiday, Special Day settings; Programmable period: 2 years
Weekly Program	Maximum number of weekly programs: 99, Programmable period: 1 week
Maximum Number of Programs	1,000 steps (total steps in 8 channels)
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 in EEPROM for approx. 10 years
Power Failure Backup (Master Clock)	Approx. 5 years (no display during power failure, counting by internal clock only)
Power Failure Backup (Secondary Clock Drive)	30 hours (hands 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 slight gloss
Enclosure (Rear Panel)	Steel, pearl gray with slight gloss
Accessories	Plastic foot (4 pcs), Miniature fuse, Instruction manual, Mounting hole drilling template, Insulated crimp terminal, USB memory, Application software
Options	GNSS Receiver GNS-300, Rack mounting fittings (in accordance with EIA Standard)