Seiko Time Creation QC-55301/QC-55302 Master Clock

Manufacturer: Seiko Time Creation Inc.
Model: QC-55301/QC-55302

Overview

The SEIKO QC-5500 Series is a high-precision quartz master clock with functions like RS-422 synchronization output and daylight saving time settings. Available in AC 110V (QC-55X01) and AC 220V (QC-55X02) models, it can automatically adjust the time when connected to the GNSS Receiver (GNS-300).

Features:

Master Clock Function: Connect up to 30 secondary clocks per channel (12 mA each).
External Synchronization: Automatically correct time loss/gain by connecting to an external master clock generating a 30-sec polarized signal.
Time Correction: Time is automatically corrected when connected to the GNSS Receiver (GNS-300).
Related products enhance system synchronization and time accuracy.

Specification

Feature	Specification
Number of Secondary Clock Circuits	3 circuits
Crystal Oscillator Frequency	4.194304 MHz
Time Accuracy	Weekly rate of less than ±0.7 seconds (+5℃~+35℃), no accumulated error after time correction
Time Display (Master Clock)	Year, month, date, hour, minute, and seconds, Digital display in 24-hour indication (not displayed during power failure)
Time Display (Monitor Clock)	30-second interval hand movement
Time Setting (Master Clock)	Setting of year, month, date, hour, minute, and seconds
Time Setting (Monitor Clock)	60X speed quick advance of hands by APC system
Daylight Saving Time	Setting of year, month, date, and hour for start date, and month, date, and hour for end date
Secondary Clock Driver (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 rechargeable battery
Battery Protection	Overdischarge prevention circuit
Signal Voltage Detection	Signal voltage stopper function (stops output when secondary clock driving voltage lowers)
External Synchronization Input	DC 24V, 30-sec. polarized signal, Every hour except 7, 19, 0, and 12 o’clock; Synchronizable loss/gain range: Less than 15 seconds
External Synchronization Output	RS-422
GPS Time Correction	Time correction 24 times a day (every hour on the hour when GPS Receiver is connected)
Input Power Supply	QC-55301: AC 110V ±10% or DC 24V ±10%; QC-55302: AC 220V ±10% or DC 24V ±10%
Power Consumption	42W
Power Failure Backup (Master Clock)	Approx. 5 years (no display during power failure, counting by internal clock only)
Power Failure Backup (Secondary Clock Driver)	30 hours (hands adjusted automatically after recovery)
Operational Temperature Range	-10℃~+50℃
Outer Dimensions	W420×H354×D110 (mm)
Weight	Approx. 7.5 kg
Enclosure (Front Panel)	ABS and stainless steel, pearl gray with slight gloss
Enclosure (Rear Panel)	Stainless steel, pearl gray with slight gloss
Accessories	Plastic foot (4 pcs), Miniature fuse, Instruction manual, Mounting hole drilling template, Insulated crimp terminal
Options	Rack mounting fittings (in accordance with EIA Standard), GNSS Receiver (GNS-300)

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)