K8DT-TH
4
Connections
Terminal Diagram
Note: 1.
Do not connect anything to terminals that are shaded in gray.
2.
There is no polarity for the DC power supply input.
Timing Charts
Functions
SV Protection
This function protects (i.e., prohibits changing) the alarm setting,
operating method, and modes for the Temperature Monitoring Relay
that have been set on the rotary switches and DIP switch.
The protection function is activated by pressing the output latch reset
button on the Temperature Monitoring Relay for at least 5 s. The
power indicator will flash when the protection is activated.
The protection function can be released by pressing the output latch
reset button on the Temperature Monitoring Relay for at least 5 s. The
power indicator will light while the protection is being reset.
(1) Temperature sensor input
TH1
TH2
K8DT-TH1 C A
(1) (2)(3)
B
+
B
B
A
A
B
−
B
+
+
B
−
A1
B
+
14
A2
A
11
12
B
−
DIP SW
Inside
Inside
(2) Output
C: Relay Output
T: Transistor Output
14
11
12
14
11
(3) Power supply voltage
A: 100 to 240 VAC
D: 24 VAC/VDC
(No polarity)
A1
A2
A1
A2
−
Relay output (normally closed)
(11) to (14)
Relay output (normally open)
(11) to (14)
Temperature alarm or other error
Power supply
Relay output (latched)
(11) to (14)
LATCH_RESET
Temperature alarm or other error
Power supply
PWR_LED
SV Protect Mode
Power supply
ALM_LED
Temperature alarm
Power supply
Other error
Temperature alarm lower limit
(11) to (14)
Temperature alarm upper limit
(11) to (14)
Temperature settings
Note: Other errors: sensor open circuit error, sensor input error,
temperature setting error, and memory error.
0.02 s
2°C (°F)
2°C (°F)
Flashing
Flashing
Note: If LATCH_RESET is enabled, alarm status will be retained even if the power supply is cycled.
To clear the alarm status, press the LATCH_RESET button.
(Default: Latching enabled.)
Temperature Alarm: Hysteresis: 2°C or 2°F
Changing between Normally Open and Normally Closed
Latched Operation:
Relay outputs remain latched even after the alarm or error is reset.
Operation of Indicators