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SR74A
2-7. Terminal arrangement table
3. Instruction for front panel
3-1. Drawing and the name of the parts
This is an example of the front panel of SR73A.
Name of parts
: Measured value
(PV) display
: Set value (SV)
display
: Monitor LED
: Key switches
10
20
23
24
19
18
17
16
15
14
13
12
22
21
11
9
8
7
6
5
4
3
2
1
422A
485
RD–
RD+
SD–
–
SD+
+
SG
SG
L
N
COM+
NC
COM
AL/HR
AH
NO –
Power
CONTROL
OUTPUT
ALARM
OUTPUT
CT
SB
IN PUT
RTD
TC•mV
V•mA
+A
–B
B
~
Heater break alarm (option) CT input terminal
Name of terminal and description
Terminal number
SR73A and 74A
Power terminal
100-260V AC
±
10% 50/60Hz 12VA
Protective conductor terminal ( )
Input terminal
R. T. D. A, Thermocouple, Voltage, C
R. T. D. B, Thermocouple, Voltage, Current –
R. T. D. B
Output terminal
Contact: COM, SSR Drive voltage, Voltage,
C
Contact: NO, SSR Drive voltage, Voltage,
Current –
Contact: NC
Communication terminal
For RS-422A
For RS-485
SG
SG
SD+
+
SD–
–
RD+
RD–
Alarm output (option) terminal
COM
Contact rating 240V AC 1.5A
(resistive load)
AH
Higher limit alarm
AL/HB Lower limit alarm or heater break alarm
Set value bias (option) input terminal
11-12
13
21-22
23-24
7
8
10
18
19
20
1
2
3
4
5
14
15
16
Note:
For Thermocouple, Voltage, and Current input,
measurement error results by connection between B and
B terminal.
3-2. Instruction for front panel
: Measured value (PV) display (green)
(1) Displays current measured value on the mode 0 basic
screen.
(2) Displays parameter type on each parameter screen.
: Set value (SV) display (orange)
(1) Displays set value on the mode 0 basic screen.
(2) Displays selected item and set value on each parameter
screen.
: Monitor LED
(1) OUT (output) monitor LED (green)
• For contact or SSR drive voltage output, a light turns
on for output ON and turns off for output OFF.
• For current or voltage output, the light intensity
changes proportionally to the output altitude.
(2) AT (auto tuning) monitor LED (green)
• On selection by , ON turns on AT waiting
( key), flashes on AT execution.
(3) AH alarm output monitor LED (red)
• Turns on for higher limit alarm output ON.
(4) AL/HB alarm output monitor LED (red)
• Turns on for lower alarm output ON or heater break
alarm ON.
(5) MAN (manual control output) monitor LED (green)
• Flashes when control output is in manual operation.
(6) STBY (control output stop) monitor LED (green)
• Turns on when the control output stop mode is
selected.
(7) COM (communication) monitor LED (green)
• Turns on when the remote communication mode is
selected.
: Key switches
(1)
(parameter) key
• Press on set screen to move to next set screen.
• Keep pressing three (3) seconds for function of move
key between basic screen of the mode 0 screen group
and direct call screen of mode 1 screen group.
(2)
(down) key
• Press on the set screen to flash the point of the least
digit and to reduce data or back increment data.
(3)
(up) key
• Press on the set screen to flash the point of the least
digit and to increase data of increment data.
(4)
(entry/registration) key
• Press on the set screen of the mode 0 screen group
and mode 1 screen group to fix the data changed by
the , keys and to extinguish flash of the point.
• The function selecting screen, of the mode 2 screen
group, registers data of the point flashing digit and
simultaneously shifts a data changeable digit (the
point flashing digit).
• The input scaling screen, of the mode 2 screen group,
registers data and shifts a parameter capable of being
set (in the row in which the rightmost point is
flashing).
• Press the key for five seconds and it functions to
change the basic screen of the mode 0 screen group to
the function selecting screen of the mode 2 screen
group and vice versa.
(5)
(manual) key
• Pressing this key on the control output screen changes
automatic control output to manual control output and
vice versa. During manual control output, the MAN
monitor LED flashes.
• The key does not function in the control output
stop mode.
ENT
MAN
ENT
MAN
PV
SV
OUT
AT
AH
MAN
STBY
COM
AH/HB
SHIMADEN
ENT
MAN
˚C
4
3
2
1
