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"Notice"
Please ensure that this instruction manual is given to the final user
of the instrument.
Preface
This instruction manual is meant for those who will be involved
in the wiring, installation, operation and routine maintenance of
the SR73A and 74A series.
This manual describes the care, installation, wiring, function, and
proper procedures for the operation of SR73A and 74A series.
Keep this manual at the work site during operation of the SR73A
and 74A series. While using this instrument, you should always
follow the guidance provided herein.
For matters regarding safety, potential damage to equipment
and/or facilities, additional instructions are indicated by the
following headings:
Exercise extreme caution as indicated. This heading indicates
hazardous conditions that could cause injury or death of
personnel.
Exercise extreme caution as indicated. This heading indicates
hazardous conditions that could cause damage to equipment
and/or facilities.
NOTE
This heading indicates additional instructions and/or notes.
The mark designates a protective conductor terminal. Make
sure to properly ground it.
The Matters regarding Safety
SR73A and 74A Series
Digital Controller
Instruction Manual
Thank you for purchasing the Shimaden SR73A and 74A Series. Please check that the delivered product is
the correct item you ordered. Please do not begin operating this product until you have read this instruction
manual thoroughly and understand its contents.
WARNING
CAUTION
SR73A and 74A series controllers are designed for controlling
temperature, humidity and other physical subjects. It must not
be used in any way that may adversely affect the safety, health
or working conditions of those who come into contact with the
effects of its usage. When used, adequate and effective safety
countermeasures must be provided at all times. No warranty,
express or implied, is valid in the case of usage without having
implemented proper safety countermeasures.
WARNING
To avoid damage to the connected equipment, facilities or the
product itself due to a fault of the product, safety
countermeasure must be taken before usage, such as proper
installation of the fuse and the overheating protection device.
No warranty, express or implied, is valid in the case of usage
without having implemented proper safety countermeasures.
CAUTION
• The mark on the plate affixed to the instrument:
On the terminal nameplate affixed to the case of your
instrument, the mark is printed. This is to warn you of the
risk of electrical shock which may result if the charger is
touched while it is energized.
• A means to allow the power to be turned off, such as a switch
or a breaker, should be installed in the external power circuit
to be connected to the power terminal of the instrument.
Fix the switch or the breaker adjacently to the instrument in a
position which allows it to be operated with ease, and with an
indication that it is a means of turning the power off. The
switch or the breaker should meet the requirements of IEC
947.
• Fuse:
Since the instrument does not have a built-in fuse, do not
forget to install a fuse in the power circuit to be connected to
the power terminal.
The fuse should be positioned between the switch or the
breaker and the instrument and be attached to the L side of
the power terminal.
Fuse Rating: 250V AC 0.5A/medium lagged or lagged type
Use a fuse which meets the requirements of IEC 127.
• Voltage/current of a load to be connected to the output
terminal and the alarm terminal should be within a rated
range. Otherwise, the temperature will rise and reduce the
life of the product and/or result in problems with the product.
For the rated voltage/current, see 8. Specifications on page
15. The output terminal should be connected with a device
which meets the requirements of IEC 1010.
• A voltage/current different from that of the input
specification should not be added on the input terminal. It
may reduce the life of the product and/or result in problems
with the product.
For the rated voltage/current, see 8. Specifications on page
15.
For the rated voltage (mV or V) or current (4~20 mA) input,
the input terminal should be connected with a device which
meets the requirements of IEC1010 as input terminals.
• In the case where the heater break alarm (optional) input is
0~5V DC, the CT input terminal should be connected to an
apparatus which meets IEC 1010 requirements.
• As the CT input terminal for the heater break alarm
(optional), only the attachment CT should be used. Using
anything else may result in problems with the product.
For the CT provided, refer to 1-1 Check before Use on page
2. (Except when 0~5V DC input has been selected.)
• The SR73A and 74A series controllers are provided with a
draft hole for heat discharge. Take care to prevent metal or
other foreign matter from obstructing it. Failure to do so may
result in problems with the product and may even result in
fire.
CAUTION
SR73AFC-1DE Sep. 2000
