Terminal Diagram; Timing Charts - Omron K8DT-TH Manual

K8DT-TH
Connections

Terminal Diagram

K8DT-TH1 C A
(1) (2)(3)
(1) Temperature sensor input
TH1 TH2
B B
+
B+ B− B+
A
A
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

Temperature Alarm: Hysteresis: 2°C or 2°F
Temperature settings
Temperature alarm upper limit
(11) to (14)
Temperature alarm lower limit
(11) to (14)
Changing between Normally Open and Normally Closed
Power supply
Temperature alarm or other error
Relay output (normally open)
(11) to (14)
Relay output (normally closed)
(11) to (14)
Note: Other errors: sensor open circuit error, sensor input error,
temperature setting error, and memory error.
Latched Operation:
Relay outputs remain latched even after the alarm or error is reset.
Power supply
Temperature alarm or other error
LATCH_RESET
Relay output (latched)
(11) to (14)
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.)
Operation of Indicators
Power supply
SV Protect Mode
PWR_LED
Power supply
Temperature alarm
Other error
ALM_LED
4
A1 A2
B+ B−
−
A
B−
DIP SW
12
14 11
2°C (°F)
2°C (°F)
0.02 s
Flashing
Flashing
(3) Power supply voltage
A: 100 to 240 VAC D: 24 VAC/VDC
A1 A2 A1 A2
(No polarity)
(2) Output
C: Relay Output T: Transistor Output
12
14 11 14 11
Inside
Inside
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.