29
Basic Function Details Section 2-4
■ Operation
The Over-temperature Output (TMP) operates independently of the other
external outputs. This output can be used to start an exhaust fan or air condi-
tioner to reduce the temperature in the control panel.
Example Application The output is normally closed (ON) and goes OFF when there is an error, so
receive the TMP output through an auxiliary relay. In addition, the output will
go ON momentarily when the power is turned ON, so receive the output
through a time-delay relay. (For details, refer to page 41.)
Relationship between
Control Panel
Temperature and S8M’s
Internal Temperature
The internal temperature of the S8M is displayed. This is not necessarily the
same as the ambient temperature of the S8M or the temperature inside the
control panel. The difference between the internal temperature of the S8M
and the ambient temperature depends on the current flowing through the
S8M. Consider this difference in the application. The following graph provides
reference information on the displayed internal temperature and the ambient
temperature.
Conditions: The same current was output from all branch outputs in a con-
stant-temperature bath held at a constant temperature.
1 s
5 s
t: Over-temperature
output value
(t-3)°C
Temperature (°C)
Error display and
Over-temperature
Output (TMP)
Automatic reset
Fan, etc.
S8M
TMP
COM
24 VDC
X
TR
TR
IM
At 0.5 A
At 3.5 A
80
70
60
50
40
30
20
10
0
−10
−20
−20 020406080
Displayed temperature (°C)
Ambient temperature (
°
C)
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