Seiko QT-7800 Series User manual

YEARLY PROGRAMMABLE TIMER
QT-7800 SERIES
Thank you for purchasing SEIKO Yearly Programmable Timer
QT-7800 Series.
Before using your SEIKO Yearly Programmable Timer, please
read this manual carefully for its proper use and care.
Please keep this manual handy for ready reference.

－CAUTION－
(1) This manual is the property of SEIKO and may not without the express written consent of SEIKO be
copied or reproduced in any form, in whole or in part, or used for any purpose other than that for
which it is supplied.
(2) This manual may be subject to change without notice.
(3) This manual has been prepared to give complete information necessary for the operation, use,
handling and maintenance of MODEL QT-7800 Series. For the purpose of our constant technical
manual improvement program, your questions, advice, suggestions and comments on the
descriptions, illustrations, procedures or any matter concerning this manual are highly appreciated.
(4) SEIKO shall have no liability to the user in respect of any loss or damages, whether consequential
or incidental, sustained by the user if such loss or damages are:
1) due to abuse, misuse, failure to observe instructions given in the manual furnished by SEIKO
and neglect of other reasonable care and servicing due to be done by the user irrespective of
such instructions, and failure due to deliberate actions or gross negligence or accident;
2) caused by changes, modifications, or alterations made without prior written consent of SEIKO
or by any person other than authorized by SEIKO; or,
3) due to negligence on the part of the user of what should be done or should not be done as a
good caretaker of Yearly Programmable Timer Model QT-7800 Series.
－ SAFETY ALERT SYMBOLS －
The symbols and terms used in this manual have the meaning as explained below:
DANGER
DANGER is used to indicate the presence of an imminent
hazard which is likely to cause severe personal injury, death,
or substantial property damage if the instructions under this
heading are ignored.
WARNING
WARNING is used to indicate such operational procedures,
practices, or situations that may result in severe personal
injury or loss of life if relevant instructions are not followed
correctly.
The following pictorial symbols indicate what must NOT be done.
The following pictorial symbols indicate what must be done.
General
prohibitions
Prohibition
against
disassembly/
tampering
Prohibition
against
exposure to
water
Prohibition
against touch
General
instructions
Connection of
grounding
conductor

Table of Contents
1. SAFETY PRECAUTIONS 1
2. OVERVIEW 4
3. FEATURES 4
4. ACCESSORIES AND SPARES 4
5. LIST OF PRODUCTS 5
6. NOMENCLATURE AND FUNCTIONS (FRONT PANEL) 6
7. NOMENCLATURE AND FUNCTIONS (INSIDE PARTS) 7
8. NOMENCLATURE AND FUNCTIONS (PROGRAMMABLE TIMER) 8
9. TIME/CALENDAR SETTING 9
9.1 Powering-Up 9
9.2 Time Setting 9
9.3 Time Setting for Clock Monitors 10
9.4 Calendar Setting 11
10. NORMAL TIME MODE 12
11. TIME/DAY ADJUST MODE 13
11.1 Time Setting 14
11.2 Calendar Setting 14
11.3 Time Difference Setting 15
11.4 Time Correction Setting 16
11.4.1 External Synchronization Input (30-Sec. Polarized Signal) 16
11.4.2 Time Correction with GNSS 16
11.4.3 External Synchronization Input (RS-422) 17
11.5 Leap Second Adjustment 17
12. PROGRAM/REVIEW MODE 18
12.1 Review of Daily Program (Fn-01) 18
12.2 Review of Weekly Program (Fn-02) 19
12.3 Review of Yearly Program (Fn-03) 21
12.4 Review of Daylight Saving Time Program (Fn-04) 21
12.5 Importing Program from USB Memory (Fn-12) 22
12.6 Exporting Program to USB Memory (Fn-14) 22
12.7 Errors and Remedies in Setting Programs 23
13. NETWORK CONNECTION 24
13.1 Checking of Network Settings 24
13.2 Checking of Network Operation Status 25
14. TIME CORRECTION 25
14.1 Time Correction with GNSS (when GNSS receiver [GNS-300] is connected)
25
15. QT-7800 SERIES I/F 26
15.1 Serial Output Signal 26
15.2 Connector Pin Layout of GNSS Receiver GNS-300 27
16. LEDS ON FRONT PANEL 27
16.1 Output Monitor lamps 27
16.2 Power Monitor 27
17. INSTALLATION 28
17.1 Precautions 28
17.2 Installation Work 29
17.3 Precautions on Wiring and Installation of Secondary Clocks 29
17.4 Connection of Power Supply and Secondary Clocks 30
17.5 Connection of Timer Output 31

17.6 Connection of External Synchronization Input 32
17.7 External DC Power Supply Input (DC 24 V) 32
17.8 Connection of Battery 33
17.9 Connection of GNSS Receiver 33
17.10 NETWORK CONNECTION 34
18. TROUBLES YOU CAN SOLVE YOURSELF 35
19. BATTERY REPLACEMENT 36
20. REMARKS ON DAILY CARE AND MAINTENANCE 37
20.1 Replacement of Fuse 37
20.2 Care of Enclosure 37
21. WARRANTY 37
22. SPECIFICATIONS 38
QT-7800 Series Yearly Programmable Timer 38
Options 39

1
1. SAFETY PRECAUTIONS
The following precautions must be strictly observed for the safety of yourself and your fellow
workers and for the protection of property from loss and damages.
●Safety instructions to the customer
DANGER
Prohibition
against
unauthorized
installation and
electrical
engineering work
Never attempt any of installation work, electrical engineering, and any of the
jobs instructed to the engineering
outfit ("Installation Instructions"). All of these
jobs must always be commissioned to your engineering outfit because they
involve electric shock hazards, fire hazards and falling hazards.
WARNING
Selection of
installation
location
The Yearly Programmable Timer is designed for indoor use, and must not be
installed outdoors. Otherwise, rainwater may infiltrate into the product to cause
electric shock or fire accident.
It must not be installed i
n the bathroom or washing area or other damp places,
either. This may cause fire or electric shock hazard.
Actions to be
taken in case of
troubles
If the Yearly Programmable Timer is giving out smoke or burnt smell, or showing
other ab
normal symptoms, turn off the power switch and cut the power supply
immediately. Then, call your nearby SEIKO dealer or agent for repair service.
If the Yearly Programmable Timer is used again without being reconditioned, an
electric shock or fire may result.
Prohibition against
unauthorized
disassembly,
repair or
modification
For repair service, contact your nearby SEIKO dealer or agent. Unauthorized
disassembly, repair or modification may cause electric shock accidents or fire
accidents.
Operating
precautions
When setting the time of each monitor, do not touch any control unit other than
specified. Otherwise, an electric shock may result.
Prohibition
against wetting
with liquids
(water,
chemicals)
Never immerse the Yearly Programmable Timer into water or any other liquid, or never
expose it to splashes of water or any other liquid. Should any water or liquid enter into
it, turn off the power switch and cut the power supply immediately. Then ca
ll your
SEIKO dealer or agent for inspection and servicing. If the Yearly Programmable Timer
is used again without being reconditioned, an electric shock or fire may result.
Prohibition
against handling
with wet hands
Never operate the
Yearly Programmable Timer or POWER switch with wet
hands. Otherwise, an electric shock may result.
Handling of
power cord
When plugging and unplugging the power cord, do not pull the cord, but hold the
plug. Otherwise, it may be damag
ed to cause fire or electric shock hazard.
(For models with a power plug)
Handle the power cord with care not to damage it. Never load it with a heavy
object. Never bend over it unduly. All these could lead to an electric shock or
fire accident.
Never use the damaged power cord or plug, or loose socket. This may cause
fire or electric shock hazard.

2
WARNING
Power supply
Be sure to use only AC 110 V 50/60 Hz with QT68X01, and only AC 22
0 V 50/60
Hz with QT68X02. If any other power supply than specified is used
, electric
shock or fire accident may result.
Confirmation of
grounding
Check to see if a grounding conductor is terminated to the Yearly Programmab
le
Timer. If it is not grounded, electric shock accident may resul
t when it gets faulty
or leaky.
The grounding work is required to be of Class D or higher rating, and
shall be undertaken by a licensed electrician.
Prohibition
against
unauthorized
fuse
replacement
For fuse replacement service, contact your SEIKO dealer or agent. Do not
attempt the fuse replacement by
yourself unless you are qualified for the job.
Otherwise, an electric shock accident may result.
Replacement
and collection
of Ni-Cd battery
For replacement and collection of the built-in Ni-Cd battery, contact your SEIKO
Dealer or agent. Do not attempt the battery replacement by
yourself. Otherwise,
an electric shock accident may result.
Precautions on
the servicing of
casing
Before cleaning the surface of the casing, be sure to cut the power supply. An
electric shock accident may result.
Prohibition
against
unauthorized
servicing of the
internal
components
For t
he servicing of internal components, contact your SEIKO dealer or agent.
Do not attempt to do the servicing yourself unless you are qualified for the job.
Otherwise, an electric shock accident may result.

3
●Instructions to the engineering outfit
WARNING
Precautions on installation work
Selection of
installation
location
The Yearly Programmable Timer is designed for indoor use, and must not be
installed outdoors. Otherwise, rainwater may infiltrate into the p
roduct to cause
electric shock or fire accident.
It must not be installed in the bathroom or washing area or other damp places,
either. This may cause fire or electric shock hazard.
Load-bearing
capacity
Make sure
that the wall or other structure onto which the product is to be
mounted has a sufficient strength to bear up against the load of the product. If
the wall strength is not sufficient, it may yield to the product weight or external
shocks, letting fall the product to cause fatal accidents.
Mounting onto
the concrete
wall
When mounting on to the concrete wall, use AY plugs and bolts. Never use
wood screws to fasten the product. Wood screws may yield under wind pressure
and vibrations, and let fall the product to cause fatal accidents.
Tightening of
screws
Be sure to tighten each bolt into the anchor plug fully. Otherwise, the product
may come off from the wall as the bolts may loosen off under the influence of
wind pressure or vibrations, causing fatal accidents.
Fixing of stay
When opening the front panel, fix the stay securely to keep the panel open.
Otherwise, the front panel will be closed by touching it accidentally,
causing a
malfunction of the product as well as fatal accidents.
Electrical
engineering
work
Before wiring the input/output terminal blocks, make sure that AC power
is not
supplied, and that the battery is not connected. You are warned against
working on live circuits as they involve fatal electric shock hazards.
Grounding work
Ground the Yearly Programmable Timer by connecting a grounding conductor to
its grounding terminal. This is important for the prevention of electric shock
hazards in cas
e of troubles such as earth leakage fault. The grounding work
must be Class D or higher in rating.
Installation of
terminal board
cover
After wiring the input/output terminal blocks, be sure to replace the terminal
board cover for the protection of operators against electric shock.
Power supply
Be sure to use only AC 110 V 50/60 Hz with QT-78X01, and only AC 22
0 V
50/60 Hz with QT-78X02.
If any other power supply than specified is used,
an electric shock or a fire will be caused.
Connection of
battery
Connect the battery after all the installation and electrical works are completed.
Before connecting the battery, make sure that the power is not supplied to the
product. Otherwise, an electric shock may result.
Replacement of
battery Be sure to use only the specified battery with the Yearly Programmable Timer.
Replacement of
fuse
When the fuse was melted and needs to be replaced, first, locate
and remove
the cause, check that the power switch is turned off, and then, replace it with a
specified fuse. Otherwise, an electric shock or a fire will be caused.
For the engineering outfit

4
2. OVERVIEW
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. The programs can
be set easily using computer application software, and they can be imported into the Yearly
Programmable Timer by using USB memory. RS-422 synchronous output and daylight saving time
function are also provided.
A dedicated GNSS receiver (GNS-300) can be connected to the Yearly Programmable Timer to correct the
inner clock automatically on a regular basis. In adition,QT-7800 Series is equipped with a time server function
as standard that can bring the time of secondary clocks,computers and other devices on the network in sync
with the time of QT-7800 Series.
3. FEATURES
The Yearly Programmable Timer has 8 channels of contact signal outputs. They can be programmed
to control ON/OFF of various devices connected to the Yearly Programmable Timer. In addition to the
yearly programmable timer function, QT-7800 Series is equipped with the following functions:
(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 server function
It can bring the time of secondary clocks,computers and other devices on the network in sync with
the QT-7800 Series.
(4) 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. ACCESSORIES AND SPARES
Accessories and Spares Quantity Remarks
Plastic foot 4 pieces
USB memory 1 piece Attached with application software
Miniature fuse 3 pieces QT-7810X~QT-7820X: 250V, 2 A
QT-7830X: 250V, 3 A
Insulated crimp terminal See “Remarks”
column.
QT-78101
QT-78102
QT-78201
QT-78202
QT-78301
QT-78302
M4: 26 pcs., M3: 6 pcs.
M4: 26 pcs., M3: 6 pcs.
M4: 28 pcs., M3: 6 pcs.
M4: 28 pcs., M3: 6 pcs.
M4: 30 pcs., M3: 6 pcs.
M4: 30 pcs., M3: 6 pcs.
Instruction manual 2 copies
Mounting hole
drilling template 1 sheet

5
５．LIST OF PRODUCTS
Models with 1 secondary clock circuit
Models with 2 secondary clock circuits
Models with 3 secondary clock circuits
QT-78101
Drives up to 30
secondary clocks
QT-78102
Drives up to 30
secondary clocks
QT-78201
Drives up to 60
secondary clocks
QT-78202
Drives up to 60
secondary clocks
QT-78301
Drives up to 90
secondary clocks
QT-78302
Drives up to 90
secondary clocks

6
6. NOMENCLATURE AND FUNCTIONS (FRONT PANEL)
EX.) QT-7820X
＊ For details of the parts on the control panel,
see “8. NOMENCLATURE AND FUNCTIONS (PROGRAMMABLE TIMER)” on page 8.
Hand
adjuster swit
ch for
secondary clock monitor
Sets and stops hands of
secondary clocks.
＊Operation
switches
＊Mode switch ＊Digital display
＊”Purpose of Use” card
＊USB connector “A”
＊Output monitor lamp
＊Output control switches
Power LED
＊USB connector “B”
Sets and stops hands of master
clock.
Sets hands of all secondary
clocks simultaneously.
Hand
adjuster
switch for
master clock monitor
Master clock monitor
Moves hands at 30-sec. steps to indicate current time.
Also serves as secondary clock monitor for QT-7810X
Series.
Monitors for secondary clocks
No.1 (left) and No.2.
No secondary clock monitor is
provided for QT-7800 Series.
Secondary clock monitor
Do not use